Database.Persist.Types

This module exports many types and functions for operating on persistent's database representation. It's a bit of a kitchen sink. In the future, this module will be reorganized, and many of the dependent modules will be viewable on their own for easier documentation and organization.

Various Types of Names

There are so many kinds of names. persistent defines newtype wrappers for Text so you don't confuse what a name is and what it is supposed to be used for

module Database.Persist.Names

Database Definitions

Entity/Table Definitions

The EntityDef type is used by persistent to generate Haskell code, generate database migrations, and maintain metadata about entities. These are generated in the call to mkPersist.

module Database.Persist.EntityDef

Field definitions

The FieldDef type is used to describe how a field should be represented at the Haskell and database layers.

module Database.Persist.FieldDef

Intermediate Values

The PersistValue type is used as an intermediate layer between database and Haskell types.

module Database.Persist.PersistValue

Other Useful Stuff

data Update record

Updating a database entity.

Persistent users use combinators to create these.

Constructors

forall typ.PersistField typ => Update

Fields

• updateField :: EntityField record typ
• updateValue :: typ
• updateUpdate :: PersistUpdate

BackendUpdate (BackendSpecificUpdate (PersistEntityBackend record) record)

type family BackendSpecificUpdate backend record

data SelectOpt record

Query options.

Persistent users use these directly.

Constructors

forall typ. Asc (EntityField record typ)

forall typ. Desc (EntityField record typ)

OffsetBy Int

LimitTo Int

data Filter record

Filters which are available for select, updateWhere and deleteWhere. Each filter constructor specifies the field being filtered on, the type of comparison applied (equals, not equals, etc) and the argument for the comparison.

Persistent users use combinators to create these.

Note that it's important to be careful about the PersistFilter that you are using, if you use this directly. For example, using the In PersistFilter requires that you have an array- or list-shaped EntityField. It is possible to construct values using this that will create malformed runtime values.

Constructors

forall typ.PersistField typ => Filter

Fields

• filterField :: EntityField record typ
• filterValue :: FilterValue typ
• filterFilter :: PersistFilter

FilterAnd [Filter record]

convenient for internal use, not needed for the API

FilterOr [Filter record]

BackendFilter (BackendSpecificFilter (PersistEntityBackend record) record)

data FilterValue typ where

Value to filter with. Highly dependant on the type of filter used.

Since: 2.10.0

Constructors

FilterValue :: typ -> FilterValue typ

FilterValues :: [typ] -> FilterValue typ

UnsafeValue :: forall a typ. PersistField a => a -> FilterValue typ

type family BackendSpecificFilter backend record

data family Key record

By default, a backend will automatically generate the key Instead you can specify a Primary key made up of unique values.

Instances

(PersistEntity a, PersistEntityBackend a ~ backend, IsPersistBackend backend) => RawSql (Key a)

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> Key a -> (Int, [Text])

rawSqlColCountReason :: Key a -> String

rawSqlProcessRow :: [PersistValue] -> Either Text (Key a)

data Entity record

Datatype that represents an entity, with both its Key and its Haskell record representation.

When using a SQL-based backend (such as SQLite or PostgreSQL), an Entity may take any number of columns depending on how many fields it has. In order to reconstruct your entity on the Haskell side, persistent needs all of your entity columns and in the right order. Note that you don't need to worry about this when using persistent's API since everything is handled correctly behind the scenes.

However, if you want to issue a raw SQL command that returns an Entity, then you have to be careful with the column order. While you could use SELECT Entity.* WHERE ... and that would work most of the time, there are times when the order of the columns on your database is different from the order that persistent expects (for example, if you add a new field in the middle of you entity definition and then use the migration code -- persistent will expect the column to be in the middle, but your DBMS will put it as the last column). So, instead of using a query like the one above, you may use rawSql (from the Database.Persist.GenericSql module) with its /entity selection placeholder/ (a double question mark ??). Using rawSql the query above must be written as SELECT ?? WHERE ... Then rawSql will replace ?? with the list of all columns that we need from your entity in the right order. If your query returns two entities (i.e. (Entity backend a, Entity backend b)), then you must you use SELECT ??, ?? WHERE ..., and so on.

Constructors

Entity

Fields

• entityKey :: Key record
• entityVal :: record

Instances

(Eq (Key record), Eq record) => Eq (Entity record)

Defined in Database.Persist.Class.PersistEntity

Methods

(==) :: Entity record -> Entity record -> Bool

(/=) :: Entity record -> Entity record -> Bool

(Ord (Key record), Ord record) => Ord (Entity record)

Defined in Database.Persist.Class.PersistEntity

Methods

compare :: Entity record -> Entity record -> Ordering

(<) :: Entity record -> Entity record -> Bool

(<=) :: Entity record -> Entity record -> Bool

(>) :: Entity record -> Entity record -> Bool

(>=) :: Entity record -> Entity record -> Bool

max :: Entity record -> Entity record -> Entity record

min :: Entity record -> Entity record -> Entity record

(Read (Key record), Read record) => Read (Entity record)

Defined in Database.Persist.Class.PersistEntity

Methods

readsPrec :: Int -> ReadS (Entity record)

readList :: ReadS [Entity record]

readPrec :: ReadPrec (Entity record)

readListPrec :: ReadPrec [Entity record]

(Show (Key record), Show record) => Show (Entity record)

Defined in Database.Persist.Class.PersistEntity

Methods

showsPrec :: Int -> Entity record -> ShowS

show :: Entity record -> String

showList :: [Entity record] -> ShowS

(Generic (Key record), Generic record) => Generic (Entity record)

Defined in Database.Persist.Class.PersistEntity

Associated Types

type Rep (Entity record) :: Type -> Type

Methods

from :: Entity record -> Rep (Entity record) x

to :: Rep (Entity record) x -> Entity record

(PersistEntity record, PersistField record, PersistField (Key record)) => PersistField (Entity record)

Defined in Database.Persist.Class.PersistEntity

Methods

toPersistValue :: Entity record -> PersistValue

fromPersistValue :: PersistValue -> Either Text (Entity record)

(TypeError (EntityErrorMessage a) :: Constraint) => SafeToInsert (Entity a)

Defined in Database.Persist.Class.PersistEntity

(PersistField record, PersistEntity record) => PersistFieldSql (Entity record)

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (Entity record) -> SqlType

(PersistEntity record, PersistEntityBackend record ~ backend, IsPersistBackend backend) => RawSql (Entity record)

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> Entity record -> (Int, [Text])

rawSqlColCountReason :: Entity record -> String

rawSqlProcessRow :: [PersistValue] -> Either Text (Entity record)

type Rep (Entity record)

Defined in Database.Persist.Class.PersistEntity

type Rep (Entity record) = D1 ('MetaData "Entity" "Database.Persist.Class.PersistEntity" "persistent-2.14.0.3-8JshS7qOERNDhHIq3M4zjU" 'False) (C1 ('MetaCons "Entity" 'PrefixI 'True) (S1 ('MetaSel ('Just "entityKey") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Key record)) :*: S1 ('MetaSel ('Just "entityVal") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 record)))

newtype OverflowNatural

Prior to persistent-2.11.0, we provided an instance of PersistField for the Natural type. This was in error, because Natural represents an infinite value, and databases don't have reasonable types for this.

The instance for Natural used the Int64 underlying type, which will cause underflow and overflow errors. This type has the exact same code in the instances, and will work seamlessly.

A more appropriate type for this is the Word series of types from Data.Word. These have a bounded size, are guaranteed to be non-negative, and are quite efficient for the database to store.

Since: 2.11.0

Constructors

OverflowNatural

Fields

• unOverflowNatural :: Natural

Instances

Eq OverflowNatural

Defined in Database.Persist.Class.PersistField

Methods

(==) :: OverflowNatural -> OverflowNatural -> Bool

(/=) :: OverflowNatural -> OverflowNatural -> Bool

Num OverflowNatural

Defined in Database.Persist.Class.PersistField

Methods

(+) :: OverflowNatural -> OverflowNatural -> OverflowNatural

(-) :: OverflowNatural -> OverflowNatural -> OverflowNatural

(*) :: OverflowNatural -> OverflowNatural -> OverflowNatural

negate :: OverflowNatural -> OverflowNatural

abs :: OverflowNatural -> OverflowNatural

signum :: OverflowNatural -> OverflowNatural

fromInteger :: Integer -> OverflowNatural

Ord OverflowNatural

Defined in Database.Persist.Class.PersistField

Methods

compare :: OverflowNatural -> OverflowNatural -> Ordering

(<) :: OverflowNatural -> OverflowNatural -> Bool

(<=) :: OverflowNatural -> OverflowNatural -> Bool

(>) :: OverflowNatural -> OverflowNatural -> Bool

(>=) :: OverflowNatural -> OverflowNatural -> Bool

max :: OverflowNatural -> OverflowNatural -> OverflowNatural

min :: OverflowNatural -> OverflowNatural -> OverflowNatural

Show OverflowNatural

Defined in Database.Persist.Class.PersistField

Methods

showsPrec :: Int -> OverflowNatural -> ShowS

show :: OverflowNatural -> String

showList :: [OverflowNatural] -> ShowS

PersistField OverflowNatural

Defined in Database.Persist.Class.PersistField

Methods

toPersistValue :: OverflowNatural -> PersistValue

fromPersistValue :: PersistValue -> Either Text OverflowNatural

PersistFieldSql OverflowNatural

This type uses the SqlInt64 version, which will exhibit overflow and underflow behavior. Additionally, it permits negative values in the database, which isn't ideal.

Since: 2.11.0

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy OverflowNatural -> SqlType

The rest of the types

data LiteralType

A type that determines how a backend should handle the literal.

Since: 2.12.0.0

Constructors

Escaped

The accompanying value will be escaped before inserting into the database. This is the correct default choice to use.

Since: 2.12.0.0

Unescaped

The accompanying value will not be escaped when inserting into the database. This is potentially dangerous - use this with care.

Since: 2.12.0.0

DbSpecific

The DbSpecific constructor corresponds to the legacy PersistDbSpecific constructor. We need to keep this around because old databases may have serialized JSON representations that reference this. We don't want to break the ability of a database to load rows.

Since: 2.12.0.0

Instances

Eq LiteralType

Defined in Database.Persist.PersistValue

Methods

(==) :: LiteralType -> LiteralType -> Bool

(/=) :: LiteralType -> LiteralType -> Bool

Ord LiteralType

Defined in Database.Persist.PersistValue

Methods

compare :: LiteralType -> LiteralType -> Ordering

(<) :: LiteralType -> LiteralType -> Bool

(<=) :: LiteralType -> LiteralType -> Bool

(>) :: LiteralType -> LiteralType -> Bool

(>=) :: LiteralType -> LiteralType -> Bool

max :: LiteralType -> LiteralType -> LiteralType

min :: LiteralType -> LiteralType -> LiteralType

Read LiteralType

Defined in Database.Persist.PersistValue

Methods

readsPrec :: Int -> ReadS LiteralType

readList :: ReadS [LiteralType]

readPrec :: ReadPrec LiteralType

readListPrec :: ReadPrec [LiteralType]

Show LiteralType

Defined in Database.Persist.PersistValue

Methods

showsPrec :: Int -> LiteralType -> ShowS

show :: LiteralType -> String

showList :: [LiteralType] -> ShowS

data PersistValue

A raw value which can be stored in any backend and can be marshalled to and from a PersistField.

Constructors

PersistText Text

PersistByteString ByteString

PersistInt64 Int64

PersistDouble Double

PersistRational Rational

PersistBool Bool

PersistDay Day

PersistTimeOfDay TimeOfDay

PersistUTCTime UTCTime

PersistNull

PersistList [PersistValue]

PersistMap [(Text, PersistValue)]

PersistObjectId ByteString

Intended especially for MongoDB backend

PersistArray [PersistValue]

Intended especially for PostgreSQL backend for text arrays

PersistLiteral_ LiteralType ByteString

This constructor is used to specify some raw literal value for the backend. The LiteralType value specifies how the value should be escaped. This can be used to make special, custom types avaialable in the back end.

Since: 2.12.0.0

Bundled Patterns

pattern PersistDbSpecific :: ByteString -> PersistValue

Deprecated: Deprecated since 2.11 because of inconsistent escaping behavior across backends. The Postgres backend escapes these values, while the MySQL backend does not. If you are using this, please switch to PersistLiteral_ and provide a relevant LiteralType for your conversion.

This pattern synonym used to be a data constructor for the PersistValue type. It was changed to be a pattern so that JSON-encoded database values could be parsed into their corresponding values. You should not use this, and instead prefer to pattern match on PersistLiteral_ directly.

If you use this, it will overlap a patern match on the 'PersistLiteral_, PersistLiteral, and PersistLiteralEscaped patterns. If you need to disambiguate between these constructors, pattern match on PersistLiteral_ directly.

Since: 2.12.0.0

pattern PersistLiteral :: ByteString -> PersistValue

This pattern synonym used to be a data constructor on PersistValue, but was changed into a catch-all pattern synonym to allow backwards compatiblity with database types. See the documentation on PersistDbSpecific for more details.

Since: 2.12.0.0

pattern PersistLiteralEscaped :: ByteString -> PersistValue

This pattern synonym used to be a data constructor on PersistValue, but was changed into a catch-all pattern synonym to allow backwards compatiblity with database types. See the documentation on PersistDbSpecific for more details.

Since: 2.12.0.0

Instances

Eq PersistValue

Defined in Database.Persist.PersistValue

Methods

(==) :: PersistValue -> PersistValue -> Bool

(/=) :: PersistValue -> PersistValue -> Bool

Ord PersistValue

Defined in Database.Persist.PersistValue

Methods

compare :: PersistValue -> PersistValue -> Ordering

(<) :: PersistValue -> PersistValue -> Bool

(<=) :: PersistValue -> PersistValue -> Bool

(>) :: PersistValue -> PersistValue -> Bool

(>=) :: PersistValue -> PersistValue -> Bool

max :: PersistValue -> PersistValue -> PersistValue

min :: PersistValue -> PersistValue -> PersistValue

Read PersistValue

Defined in Database.Persist.PersistValue

Methods

readsPrec :: Int -> ReadS PersistValue

readList :: ReadS [PersistValue]

readPrec :: ReadPrec PersistValue

readListPrec :: ReadPrec [PersistValue]

Show PersistValue

Defined in Database.Persist.PersistValue

Methods

showsPrec :: Int -> PersistValue -> ShowS

show :: PersistValue -> String

showList :: [PersistValue] -> ShowS

ToJSON PersistValue

Defined in Database.Persist.PersistValue

Methods

toJSON :: PersistValue -> Value

toEncoding :: PersistValue -> Encoding

toJSONList :: [PersistValue] -> Value

toEncodingList :: [PersistValue] -> Encoding

FromJSON PersistValue

Defined in Database.Persist.PersistValue

Methods

parseJSON :: Value -> Parser PersistValue

parseJSONList :: Value -> Parser [PersistValue]

ToHttpApiData PersistValue

Defined in Database.Persist.PersistValue

Methods

toUrlPiece :: PersistValue -> Text

toEncodedUrlPiece :: PersistValue -> Builder

toHeader :: PersistValue -> ByteString

toQueryParam :: PersistValue -> Text

FromHttpApiData PersistValue

Defined in Database.Persist.PersistValue

Methods

parseUrlPiece :: Text -> Either Text PersistValue

parseHeader :: ByteString -> Either Text PersistValue

parseQueryParam :: Text -> Either Text PersistValue

PathPiece PersistValue

Defined in Database.Persist.PersistValue

Methods

fromPathPiece :: Text -> Maybe PersistValue

toPathPiece :: PersistValue -> Text

PersistField PersistValue

Defined in Database.Persist.Class.PersistField

Methods

toPersistValue :: PersistValue -> PersistValue

fromPersistValue :: PersistValue -> Either Text PersistValue

PersistFieldSql PersistValue

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy PersistValue -> SqlType

data FieldDef

A FieldDef represents the inormation that persistent knows about a field of a datatype. This includes information used to parse the field out of the database and what the field corresponds to.

Constructors

FieldDef

Fields

• fieldHaskell :: !FieldNameHS

  The name of the field. Note that this does not corresponds to the record labels generated for the particular entity - record labels are generated with the type name prefixed to the field, so a FieldDef that contains a FieldNameHS "name" for a type User will have a record field userName.

• fieldDB :: !FieldNameDB

  The name of the field in the database. For SQL databases, this corresponds to the column name.

• fieldType :: !FieldType

  The type of the field in Haskell.

• fieldSqlType :: !SqlType

  The type of the field in a SQL database.

• fieldAttrs :: ![FieldAttr]

  User annotations for a field. These are provided with the ! operator.

• fieldStrict :: !Bool

  If this is True, then the Haskell datatype will have a strict record field. The default value for this is True.

• fieldReference :: !ReferenceDef
• fieldCascade :: !FieldCascade

  Defines how operations on the field cascade on to the referenced tables. This doesn't have any meaning if the fieldReference is set to NoReference or SelfReference. The cascade option here should be the same as the one obtained in the fieldReference.

  Since: 2.11.0

• fieldComments :: !(Maybe Text)

  Optional comments for a Field.

  Since: 2.10.0

• fieldGenerated :: !(Maybe Text)

  Whether or not the field is a GENERATED column, and additionally the expression to use for generation.

  Since: 2.11.0.0

• fieldIsImplicitIdColumn :: !Bool

  True if the field is an implicit ID column. False otherwise.

  Since: 2.13.0.0

Instances

Eq FieldDef

Defined in Database.Persist.Types.Base

Methods

(==) :: FieldDef -> FieldDef -> Bool

(/=) :: FieldDef -> FieldDef -> Bool

Ord FieldDef

Defined in Database.Persist.Types.Base

Methods

compare :: FieldDef -> FieldDef -> Ordering

(<) :: FieldDef -> FieldDef -> Bool

(<=) :: FieldDef -> FieldDef -> Bool

(>) :: FieldDef -> FieldDef -> Bool

(>=) :: FieldDef -> FieldDef -> Bool

max :: FieldDef -> FieldDef -> FieldDef

min :: FieldDef -> FieldDef -> FieldDef

Read FieldDef

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS FieldDef

readList :: ReadS [FieldDef]

readPrec :: ReadPrec FieldDef

readListPrec :: ReadPrec [FieldDef]

Show FieldDef

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> FieldDef -> ShowS

show :: FieldDef -> String

showList :: [FieldDef] -> ShowS

Lift FieldDef

Defined in Database.Persist.Types.Base

Methods

lift :: FieldDef -> Q Exp

liftTyped :: FieldDef -> Q (TExp FieldDef)

data PersistUpdate

Constructors

Assign

Add

Subtract

Multiply

Divide

BackendSpecificUpdate Text

Instances

Read PersistUpdate

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS PersistUpdate

readList :: ReadS [PersistUpdate]

readPrec :: ReadPrec PersistUpdate

readListPrec :: ReadPrec [PersistUpdate]

Show PersistUpdate

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> PersistUpdate -> ShowS

show :: PersistUpdate -> String

showList :: [PersistUpdate] -> ShowS

Lift PersistUpdate

Defined in Database.Persist.Types.Base

Methods

lift :: PersistUpdate -> Q Exp

liftTyped :: PersistUpdate -> Q (TExp PersistUpdate)

data UpdateException

Constructors

KeyNotFound String

UpsertError String

Instances

Show UpdateException

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> UpdateException -> ShowS

show :: UpdateException -> String

showList :: [UpdateException] -> ShowS

Exception UpdateException

Defined in Database.Persist.Types.Base

Methods

toException :: UpdateException -> SomeException

fromException :: SomeException -> Maybe UpdateException

displayException :: UpdateException -> String

data PersistFilter

Constructors

Eq

Ne

Gt

Lt

Ge

Le

In

NotIn

BackendSpecificFilter Text

Instances

Read PersistFilter

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS PersistFilter

readList :: ReadS [PersistFilter]

readPrec :: ReadPrec PersistFilter

readListPrec :: ReadPrec [PersistFilter]

Show PersistFilter

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> PersistFilter -> ShowS

show :: PersistFilter -> String

showList :: [PersistFilter] -> ShowS

Lift PersistFilter

Defined in Database.Persist.Types.Base

Methods

lift :: PersistFilter -> Q Exp

liftTyped :: PersistFilter -> Q (TExp PersistFilter)

data SqlType

A SQL data type. Naming attempts to reflect the underlying Haskell datatypes, eg SqlString instead of SqlVarchar. Different SQL databases may have different translations for these types.

Constructors

SqlString

SqlInt32

SqlInt64

SqlReal

SqlNumeric Word32 Word32

SqlBool

SqlDay

SqlTime

SqlDayTime

Always uses UTC timezone

SqlBlob

SqlOther Text

a backend-specific name

Instances

Eq SqlType

Defined in Database.Persist.Types.Base

Methods

(==) :: SqlType -> SqlType -> Bool

(/=) :: SqlType -> SqlType -> Bool

Ord SqlType

Defined in Database.Persist.Types.Base

Methods

compare :: SqlType -> SqlType -> Ordering

(<) :: SqlType -> SqlType -> Bool

(<=) :: SqlType -> SqlType -> Bool

(>) :: SqlType -> SqlType -> Bool

(>=) :: SqlType -> SqlType -> Bool

max :: SqlType -> SqlType -> SqlType

min :: SqlType -> SqlType -> SqlType

Read SqlType

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS SqlType

readList :: ReadS [SqlType]

readPrec :: ReadPrec SqlType

readListPrec :: ReadPrec [SqlType]

Show SqlType

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> SqlType -> ShowS

show :: SqlType -> String

showList :: [SqlType] -> ShowS

Lift SqlType

Defined in Database.Persist.Types.Base

Methods

lift :: SqlType -> Q Exp

liftTyped :: SqlType -> Q (TExp SqlType)

data PersistException

Constructors

PersistError Text

Generic Exception

PersistMarshalError Text

PersistInvalidField Text

PersistForeignConstraintUnmet Text

PersistMongoDBError Text

PersistMongoDBUnsupported Text

Instances

Show PersistException

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> PersistException -> ShowS

show :: PersistException -> String

showList :: [PersistException] -> ShowS

Exception PersistException

Defined in Database.Persist.Types.Base

Methods

toException :: PersistException -> SomeException

fromException :: SomeException -> Maybe PersistException

displayException :: PersistException -> String

data CascadeAction

An action that might happen on a deletion or update on a foreign key change.

Since: 2.11.0

Constructors

Cascade

Restrict

SetNull

SetDefault

Instances

Eq CascadeAction

Defined in Database.Persist.Types.Base

Methods

(==) :: CascadeAction -> CascadeAction -> Bool

(/=) :: CascadeAction -> CascadeAction -> Bool

Ord CascadeAction

Defined in Database.Persist.Types.Base

Methods

compare :: CascadeAction -> CascadeAction -> Ordering

(<) :: CascadeAction -> CascadeAction -> Bool

(<=) :: CascadeAction -> CascadeAction -> Bool

(>) :: CascadeAction -> CascadeAction -> Bool

(>=) :: CascadeAction -> CascadeAction -> Bool

max :: CascadeAction -> CascadeAction -> CascadeAction

min :: CascadeAction -> CascadeAction -> CascadeAction

Read CascadeAction

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS CascadeAction

readList :: ReadS [CascadeAction]

readPrec :: ReadPrec CascadeAction

readListPrec :: ReadPrec [CascadeAction]

Show CascadeAction

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> CascadeAction -> ShowS

show :: CascadeAction -> String

showList :: [CascadeAction] -> ShowS

Lift CascadeAction

Defined in Database.Persist.Types.Base

Methods

lift :: CascadeAction -> Q Exp

liftTyped :: CascadeAction -> Q (TExp CascadeAction)

data FieldCascade

This datatype describes how a foreign reference field cascades deletes or updates.

This type is used in both parsing the model definitions and performing migrations. A Nothing in either of the field values means that the user has not specified a CascadeAction. An unspecified CascadeAction is defaulted to Restrict when doing migrations.

Since: 2.11.0

Constructors

FieldCascade

Fields

• fcOnUpdate :: !(Maybe CascadeAction)
• fcOnDelete :: !(Maybe CascadeAction)

Instances

Eq FieldCascade

Defined in Database.Persist.Types.Base

Methods

(==) :: FieldCascade -> FieldCascade -> Bool

(/=) :: FieldCascade -> FieldCascade -> Bool

Ord FieldCascade

Defined in Database.Persist.Types.Base

Methods

compare :: FieldCascade -> FieldCascade -> Ordering

(<) :: FieldCascade -> FieldCascade -> Bool

(<=) :: FieldCascade -> FieldCascade -> Bool

(>) :: FieldCascade -> FieldCascade -> Bool

(>=) :: FieldCascade -> FieldCascade -> Bool

max :: FieldCascade -> FieldCascade -> FieldCascade

min :: FieldCascade -> FieldCascade -> FieldCascade

Read FieldCascade

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS FieldCascade

readList :: ReadS [FieldCascade]

readPrec :: ReadPrec FieldCascade

readListPrec :: ReadPrec [FieldCascade]

Show FieldCascade

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> FieldCascade -> ShowS

show :: FieldCascade -> String

showList :: [FieldCascade] -> ShowS

Lift FieldCascade

Defined in Database.Persist.Types.Base

Methods

lift :: FieldCascade -> Q Exp

liftTyped :: FieldCascade -> Q (TExp FieldCascade)

data ForeignDef

Constructors

ForeignDef

Fields

• foreignRefTableHaskell :: !EntityNameHS
• foreignRefTableDBName :: !EntityNameDB
• foreignConstraintNameHaskell :: !ConstraintNameHS
• foreignConstraintNameDBName :: !ConstraintNameDB
• foreignFieldCascade :: !FieldCascade

  Determine how the field will cascade on updates and deletions.

  Since: 2.11.0

• foreignFields :: ![(ForeignFieldDef, ForeignFieldDef)]
• foreignAttrs :: ![Attr]
• foreignNullable :: Bool
• foreignToPrimary :: Bool

  Determines if the reference is towards a Primary Key or not.

  Since: 2.11.0

Instances

Eq ForeignDef

Defined in Database.Persist.Types.Base

Methods

(==) :: ForeignDef -> ForeignDef -> Bool

(/=) :: ForeignDef -> ForeignDef -> Bool

Ord ForeignDef

Defined in Database.Persist.Types.Base

Methods

compare :: ForeignDef -> ForeignDef -> Ordering

(<) :: ForeignDef -> ForeignDef -> Bool

(<=) :: ForeignDef -> ForeignDef -> Bool

(>) :: ForeignDef -> ForeignDef -> Bool

(>=) :: ForeignDef -> ForeignDef -> Bool

max :: ForeignDef -> ForeignDef -> ForeignDef

min :: ForeignDef -> ForeignDef -> ForeignDef

Read ForeignDef

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS ForeignDef

readList :: ReadS [ForeignDef]

readPrec :: ReadPrec ForeignDef

readListPrec :: ReadPrec [ForeignDef]

Show ForeignDef

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> ForeignDef -> ShowS

show :: ForeignDef -> String

showList :: [ForeignDef] -> ShowS

Lift ForeignDef

Defined in Database.Persist.Types.Base

Methods

lift :: ForeignDef -> Q Exp

liftTyped :: ForeignDef -> Q (TExp ForeignDef)

type ForeignFieldDef = (FieldNameHS, FieldNameDB)

Used instead of FieldDef to generate a smaller amount of code

data CompositeDef

Constructors

CompositeDef

Fields

• compositeFields :: !(NonEmpty FieldDef)
• compositeAttrs :: ![Attr]

Instances

Eq CompositeDef

Defined in Database.Persist.Types.Base

Methods

(==) :: CompositeDef -> CompositeDef -> Bool

(/=) :: CompositeDef -> CompositeDef -> Bool

Ord CompositeDef

Defined in Database.Persist.Types.Base

Methods

compare :: CompositeDef -> CompositeDef -> Ordering

(<) :: CompositeDef -> CompositeDef -> Bool

(<=) :: CompositeDef -> CompositeDef -> Bool

(>) :: CompositeDef -> CompositeDef -> Bool

(>=) :: CompositeDef -> CompositeDef -> Bool

max :: CompositeDef -> CompositeDef -> CompositeDef

min :: CompositeDef -> CompositeDef -> CompositeDef

Read CompositeDef

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS CompositeDef

readList :: ReadS [CompositeDef]

readPrec :: ReadPrec CompositeDef

readListPrec :: ReadPrec [CompositeDef]

Show CompositeDef

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> CompositeDef -> ShowS

show :: CompositeDef -> String

showList :: [CompositeDef] -> ShowS

Lift CompositeDef

Defined in Database.Persist.Types.Base

Methods

lift :: CompositeDef -> Q Exp

liftTyped :: CompositeDef -> Q (TExp CompositeDef)

data UniqueDef

Type for storing the Uniqueness constraint in the Schema. Assume you have the following schema with a uniqueness constraint:

Person
  name String
  age Int
  UniqueAge age

This will be represented as:

UniqueDef
    { uniqueHaskell = ConstraintNameHS (packPTH UniqueAge)
    , uniqueDBName = ConstraintNameDB (packPTH "unique_age")
    , uniqueFields = [(FieldNameHS (packPTH "age"), FieldNameDB (packPTH "age"))]
    , uniqueAttrs = []
    }

Constructors

UniqueDef

Fields

• uniqueHaskell :: !ConstraintNameHS
• uniqueDBName :: !ConstraintNameDB
• uniqueFields :: !(NonEmpty (FieldNameHS, FieldNameDB))
• uniqueAttrs :: ![Attr]

Instances

Eq UniqueDef

Defined in Database.Persist.Types.Base

Methods

(==) :: UniqueDef -> UniqueDef -> Bool

(/=) :: UniqueDef -> UniqueDef -> Bool

Ord UniqueDef

Defined in Database.Persist.Types.Base

Methods

compare :: UniqueDef -> UniqueDef -> Ordering

(<) :: UniqueDef -> UniqueDef -> Bool

(<=) :: UniqueDef -> UniqueDef -> Bool

(>) :: UniqueDef -> UniqueDef -> Bool

(>=) :: UniqueDef -> UniqueDef -> Bool

max :: UniqueDef -> UniqueDef -> UniqueDef

min :: UniqueDef -> UniqueDef -> UniqueDef

Read UniqueDef

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS UniqueDef

readList :: ReadS [UniqueDef]

readPrec :: ReadPrec UniqueDef

readListPrec :: ReadPrec [UniqueDef]

Show UniqueDef

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> UniqueDef -> ShowS

show :: UniqueDef -> String

showList :: [UniqueDef] -> ShowS

Lift UniqueDef

Defined in Database.Persist.Types.Base

Methods

lift :: UniqueDef -> Q Exp

liftTyped :: UniqueDef -> Q (TExp UniqueDef)

data EmbedFieldDef

An EmbedFieldDef is the same as a FieldDef But it is only used for embeddedFields so it only has data needed for embedding

Constructors

EmbedFieldDef

Fields

• emFieldDB :: FieldNameDB
• emFieldEmbed :: Maybe (Either SelfEmbed EntityNameHS)

Instances

Eq EmbedFieldDef

Defined in Database.Persist.Types.Base

Methods

(==) :: EmbedFieldDef -> EmbedFieldDef -> Bool

(/=) :: EmbedFieldDef -> EmbedFieldDef -> Bool

Ord EmbedFieldDef

Defined in Database.Persist.Types.Base

Methods

compare :: EmbedFieldDef -> EmbedFieldDef -> Ordering

(<) :: EmbedFieldDef -> EmbedFieldDef -> Bool

(<=) :: EmbedFieldDef -> EmbedFieldDef -> Bool

(>) :: EmbedFieldDef -> EmbedFieldDef -> Bool

(>=) :: EmbedFieldDef -> EmbedFieldDef -> Bool

max :: EmbedFieldDef -> EmbedFieldDef -> EmbedFieldDef

min :: EmbedFieldDef -> EmbedFieldDef -> EmbedFieldDef

Read EmbedFieldDef

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS EmbedFieldDef

readList :: ReadS [EmbedFieldDef]

readPrec :: ReadPrec EmbedFieldDef

readListPrec :: ReadPrec [EmbedFieldDef]

Show EmbedFieldDef

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> EmbedFieldDef -> ShowS

show :: EmbedFieldDef -> String

showList :: [EmbedFieldDef] -> ShowS

Lift EmbedFieldDef

Defined in Database.Persist.Types.Base

Methods

lift :: EmbedFieldDef -> Q Exp

liftTyped :: EmbedFieldDef -> Q (TExp EmbedFieldDef)

data EmbedEntityDef

An EmbedEntityDef is the same as an EntityDef But it is only used for fieldReference so it only has data needed for embedding

Constructors

EmbedEntityDef

Fields

• embeddedHaskell :: EntityNameHS
• embeddedFields :: [EmbedFieldDef]

Instances

Eq EmbedEntityDef

Defined in Database.Persist.Types.Base

Methods

(==) :: EmbedEntityDef -> EmbedEntityDef -> Bool

(/=) :: EmbedEntityDef -> EmbedEntityDef -> Bool

Ord EmbedEntityDef

Defined in Database.Persist.Types.Base

Methods

compare :: EmbedEntityDef -> EmbedEntityDef -> Ordering

(<) :: EmbedEntityDef -> EmbedEntityDef -> Bool

(<=) :: EmbedEntityDef -> EmbedEntityDef -> Bool

(>) :: EmbedEntityDef -> EmbedEntityDef -> Bool

(>=) :: EmbedEntityDef -> EmbedEntityDef -> Bool

max :: EmbedEntityDef -> EmbedEntityDef -> EmbedEntityDef

min :: EmbedEntityDef -> EmbedEntityDef -> EmbedEntityDef

Read EmbedEntityDef

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS EmbedEntityDef

readList :: ReadS [EmbedEntityDef]

readPrec :: ReadPrec EmbedEntityDef

readListPrec :: ReadPrec [EmbedEntityDef]

Show EmbedEntityDef

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> EmbedEntityDef -> ShowS

show :: EmbedEntityDef -> String

showList :: [EmbedEntityDef] -> ShowS

Lift EmbedEntityDef

Defined in Database.Persist.Types.Base

Methods

lift :: EmbedEntityDef -> Q Exp

liftTyped :: EmbedEntityDef -> Q (TExp EmbedEntityDef)

data ReferenceDef

There are 3 kinds of references 1) composite (to fields that exist in the record) 2) single field 3) embedded

Constructors

NoReference

ForeignRef !EntityNameHS

A ForeignRef has a late binding to the EntityDef it references via name and has the Haskell type of the foreign key in the form of FieldType

EmbedRef EntityNameHS

SelfReference

A SelfReference stops an immediate cycle which causes non-termination at compile-time (issue #311).

Instances

Eq ReferenceDef

Defined in Database.Persist.Types.Base

Methods

(==) :: ReferenceDef -> ReferenceDef -> Bool

(/=) :: ReferenceDef -> ReferenceDef -> Bool

Ord ReferenceDef

Defined in Database.Persist.Types.Base

Methods

compare :: ReferenceDef -> ReferenceDef -> Ordering

(<) :: ReferenceDef -> ReferenceDef -> Bool

(<=) :: ReferenceDef -> ReferenceDef -> Bool

(>) :: ReferenceDef -> ReferenceDef -> Bool

(>=) :: ReferenceDef -> ReferenceDef -> Bool

max :: ReferenceDef -> ReferenceDef -> ReferenceDef

min :: ReferenceDef -> ReferenceDef -> ReferenceDef

Read ReferenceDef

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS ReferenceDef

readList :: ReadS [ReferenceDef]

readPrec :: ReadPrec ReferenceDef

readListPrec :: ReadPrec [ReferenceDef]

Show ReferenceDef

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> ReferenceDef -> ShowS

show :: ReferenceDef -> String

showList :: [ReferenceDef] -> ShowS

Lift ReferenceDef

Defined in Database.Persist.Types.Base

Methods

lift :: ReferenceDef -> Q Exp

liftTyped :: ReferenceDef -> Q (TExp ReferenceDef)

data FieldType

A FieldType describes a field parsed from the QuasiQuoter and is used to determine the Haskell type in the generated code.

name Text parses into FTTypeCon Nothing Text

name T.Text parses into FTTypeCon (Just T Text)

name (Jsonb User) parses into:

FTApp (FTTypeCon Nothing Jsonb) (FTTypeCon Nothing User)

Constructors

FTTypeCon (Maybe Text) Text

Optional module and name.

FTLit FieldTypeLit

FTTypePromoted Text

FTApp FieldType FieldType

FTList FieldType

Instances

Eq FieldType

Defined in Database.Persist.Types.Base

Methods

(==) :: FieldType -> FieldType -> Bool

(/=) :: FieldType -> FieldType -> Bool

Ord FieldType

Defined in Database.Persist.Types.Base

Methods

compare :: FieldType -> FieldType -> Ordering

(<) :: FieldType -> FieldType -> Bool

(<=) :: FieldType -> FieldType -> Bool

(>) :: FieldType -> FieldType -> Bool

(>=) :: FieldType -> FieldType -> Bool

max :: FieldType -> FieldType -> FieldType

min :: FieldType -> FieldType -> FieldType

Read FieldType

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS FieldType

readList :: ReadS [FieldType]

readPrec :: ReadPrec FieldType

readListPrec :: ReadPrec [FieldType]

Show FieldType

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> FieldType -> ShowS

show :: FieldType -> String

showList :: [FieldType] -> ShowS

Lift FieldType

Defined in Database.Persist.Types.Base

Methods

lift :: FieldType -> Q Exp

liftTyped :: FieldType -> Q (TExp FieldType)

data FieldAttr

Attributes that may be attached to fields that can affect migrations and serialization in backend-specific ways.

While we endeavor to, we can't forsee all use cases for all backends, and so FieldAttr is extensible through its constructor FieldAttrOther.

Since: 2.11.0.0

Constructors

FieldAttrMaybe

The Maybe keyword goes after the type. This indicates that the column is nullable, and the generated Haskell code will have a Maybe type for it.

Example:

User
    name Text Maybe

FieldAttrNullable

This indicates that the column is nullable, but should not have a Maybe type. For this to work out, you need to ensure that the PersistField instance for the type in question can support a PersistNull value.

data What = NoWhat | Hello Text

instance PersistField What where
    fromPersistValue PersistNull =
        pure NoWhat
    fromPersistValue pv =
        Hello $ fromPersistValue pv

instance PersistFieldSql What where
    sqlType _ = SqlString

User
    what What nullable

FieldAttrMigrationOnly

This tag means that the column will not be present on the Haskell code, but will not be removed from the database. Useful to deprecate fields in phases.

You should set the column to be nullable in the database. Otherwise, inserts won't have values.

User
    oldName Text MigrationOnly
    newName Text

FieldAttrSafeToRemove

A SafeToRemove attribute is not present on the Haskell datatype, and the backend migrations should attempt to drop the column without triggering any unsafe migration warnings.

Useful after you've used MigrationOnly to remove a column from the database in phases.

User
    oldName Text SafeToRemove
    newName Text

FieldAttrNoreference

This attribute indicates that we should create a foreign key reference from a column. By default, persistent will try and create a foreign key reference for a column if it can determine that the type of the column is a Key entity or an EntityId and the Entity's name was present in mkPersist.

This is useful if you want to use the explicit foreign key syntax.

Post
    title    Text

Comment
    postId   PostId      noreference
    Foreign Post fk_comment_post postId

FieldAttrReference Text

This is set to specify precisely the database table the column refers to.

Post
    title    Text

Comment
    postId   PostId references="post"

You should not need this - persistent should be capable of correctly determining the target table's name. If you do need this, please file an issue describing why.

FieldAttrConstraint Text

Specify a name for the constraint on the foreign key reference for this table.

Post
    title    Text

Comment
    postId   PostId constraint="my_cool_constraint_name"

FieldAttrDefault Text

Specify the default value for a column.

User
    createdAt    UTCTime     default="NOW()"

Note that a default= attribute does not mean you can omit the value while inserting.

FieldAttrSqltype Text

Specify a custom SQL type for the column. Generally, you should define a custom datatype with a custom PersistFieldSql instance instead of using this.

User
    uuid     Text    sqltype=UUID

FieldAttrMaxlen Integer

Set a maximum length for a column. Useful for VARCHAR and indexes.

User
    name     Text    maxlen=200

    UniqueName name

FieldAttrSql Text

Specify the database name of the column.

User
    blarghle     Int     sql="b_l_a_r_g_h_l_e"

Useful for performing phased migrations, where one column is renamed to another column over time.

FieldAttrOther Text

A grab bag of random attributes that were unrecognized by the parser.

Instances

Eq FieldAttr

Defined in Database.Persist.Types.Base

Methods

(==) :: FieldAttr -> FieldAttr -> Bool

(/=) :: FieldAttr -> FieldAttr -> Bool

Ord FieldAttr

Defined in Database.Persist.Types.Base

Methods

compare :: FieldAttr -> FieldAttr -> Ordering

(<) :: FieldAttr -> FieldAttr -> Bool

(<=) :: FieldAttr -> FieldAttr -> Bool

(>) :: FieldAttr -> FieldAttr -> Bool

(>=) :: FieldAttr -> FieldAttr -> Bool

max :: FieldAttr -> FieldAttr -> FieldAttr

min :: FieldAttr -> FieldAttr -> FieldAttr

Read FieldAttr

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS FieldAttr

readList :: ReadS [FieldAttr]

readPrec :: ReadPrec FieldAttr

readListPrec :: ReadPrec [FieldAttr]

Show FieldAttr

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> FieldAttr -> ShowS

show :: FieldAttr -> String

showList :: [FieldAttr] -> ShowS

Lift FieldAttr

Defined in Database.Persist.Types.Base

Methods

lift :: FieldAttr -> Q Exp

liftTyped :: FieldAttr -> Q (TExp FieldAttr)

type Attr = Text

type ExtraLine = [Text]

data WhyNullable

The reason why a field is nullable is very important. A field that is nullable because of a Maybe tag will have its type changed from A to Maybe A. OTOH, a field that is nullable because of a nullable tag will remain with the same type.

Constructors

ByMaybeAttr

ByNullableAttr

Instances

Eq WhyNullable

Defined in Database.Persist.Types.Base

Methods

(==) :: WhyNullable -> WhyNullable -> Bool

(/=) :: WhyNullable -> WhyNullable -> Bool

Show WhyNullable

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> WhyNullable -> ShowS

show :: WhyNullable -> String

showList :: [WhyNullable] -> ShowS

data IsNullable

Constructors

Nullable !WhyNullable

NotNullable

Instances

Eq IsNullable

Defined in Database.Persist.Types.Base

Methods

(==) :: IsNullable -> IsNullable -> Bool

(/=) :: IsNullable -> IsNullable -> Bool

Show IsNullable

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> IsNullable -> ShowS

show :: IsNullable -> String

showList :: [IsNullable] -> ShowS

data Checkmark

A Checkmark should be used as a field type whenever a uniqueness constraint should guarantee that a certain kind of record may appear at most once, but other kinds of records may appear any number of times.

NOTE: You need to mark any Checkmark fields as nullable (see the following example).

For example, suppose there's a Location entity that represents where a user has lived:

Location
    user    UserId
    name    Text
    current Checkmark nullable

    UniqueLocation user current

The UniqueLocation constraint allows any number of Inactive Locations to be current. However, there may be at most one current Location per user (i.e., either zero or one per user).

This data type works because of the way that SQL treats NULLable fields within uniqueness constraints. The SQL standard says that NULL values should be considered different, so we represent Inactive as SQL NULL, thus allowing any number of Inactive records. On the other hand, we represent Active as TRUE, so the uniqueness constraint will disallow more than one Active record.

Note: There may be DBMSs that do not respect the SQL standard's treatment of NULL values on uniqueness constraints, please check if this data type works before relying on it.

The SQL BOOLEAN type is used because it's the smallest data type available. Note that we never use FALSE, just TRUE and NULL. Provides the same behavior Maybe () would if () was a valid PersistField.

Constructors

Active

When used on a uniqueness constraint, there may be at most one Active record.

Inactive

When used on a uniqueness constraint, there may be any number of Inactive records.

Instances

Bounded Checkmark

Defined in Database.Persist.Types.Base

Methods

minBound :: Checkmark

maxBound :: Checkmark

Enum Checkmark

Defined in Database.Persist.Types.Base

Methods

succ :: Checkmark -> Checkmark

pred :: Checkmark -> Checkmark

toEnum :: Int -> Checkmark

fromEnum :: Checkmark -> Int

enumFrom :: Checkmark -> [Checkmark]

enumFromThen :: Checkmark -> Checkmark -> [Checkmark]

enumFromTo :: Checkmark -> Checkmark -> [Checkmark]

enumFromThenTo :: Checkmark -> Checkmark -> Checkmark -> [Checkmark]

Eq Checkmark

Defined in Database.Persist.Types.Base

Methods

(==) :: Checkmark -> Checkmark -> Bool

(/=) :: Checkmark -> Checkmark -> Bool

Ord Checkmark

Defined in Database.Persist.Types.Base

Methods

compare :: Checkmark -> Checkmark -> Ordering

(<) :: Checkmark -> Checkmark -> Bool

(<=) :: Checkmark -> Checkmark -> Bool

(>) :: Checkmark -> Checkmark -> Bool

(>=) :: Checkmark -> Checkmark -> Bool

max :: Checkmark -> Checkmark -> Checkmark

min :: Checkmark -> Checkmark -> Checkmark

Read Checkmark

Defined in Database.Persist.Types.Base

Methods

readsPrec :: Int -> ReadS Checkmark

readList :: ReadS [Checkmark]

readPrec :: ReadPrec Checkmark

readListPrec :: ReadPrec [Checkmark]

Show Checkmark

Defined in Database.Persist.Types.Base

Methods

showsPrec :: Int -> Checkmark -> ShowS

show :: Checkmark -> String

showList :: [Checkmark] -> ShowS

ToHttpApiData Checkmark

Defined in Database.Persist.Types.Base

Methods

toUrlPiece :: Checkmark -> Text

toEncodedUrlPiece :: Checkmark -> Builder

toHeader :: Checkmark -> ByteString

toQueryParam :: Checkmark -> Text

FromHttpApiData Checkmark

Defined in Database.Persist.Types.Base

Methods

parseUrlPiece :: Text -> Either Text Checkmark

parseHeader :: ByteString -> Either Text Checkmark

parseQueryParam :: Text -> Either Text Checkmark

PathPiece Checkmark

Defined in Database.Persist.Types.Base

Methods

fromPathPiece :: Text -> Maybe Checkmark

toPathPiece :: Checkmark -> Text

PersistField Checkmark

Defined in Database.Persist.Class.PersistField

Methods

toPersistValue :: Checkmark -> PersistValue

fromPersistValue :: PersistValue -> Either Text Checkmark

PersistFieldSql Checkmark

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Checkmark -> SqlType

fieldAttrsContainsNullable :: [FieldAttr] -> IsNullable

keyAndEntityFields :: EntityDef -> NonEmpty FieldDef

Returns a NonEmpty list of FieldDef that correspond with the key columns for an EntityDef.

parseFieldAttrs :: [Text] -> [FieldAttr]

Parse raw field attributes into structured form. Any unrecognized attributes will be preserved, identically as they are encountered, as FieldAttrOther values.

Since: 2.11.0.0

noCascade :: FieldCascade

A FieldCascade that does nothing.

Since: 2.11.0