Database.Relational.Query.Monad.Trans.Restricting

This module defines monad transformer which lift to basic MonadQuery.

Transformer into restricted context

data Restrictings c m a

Type to accumulate query restrictions. Type c is context tag of restriction building like Flat (where) or Aggregated (having).

Instances

MonadQualify ConfigureQuery QueryAggregate

Instance to lift from qualified table forms into QueryAggregate.

MonadQualify ConfigureQuery (Orderings Flat QueryCore)

Instance to lift from qualified table forms into QuerySimple.

(Monad q, Functor q) => MonadRestrict c (Restrictings c q)

MonadRestrict instance.

MonadRestrict Flat q => MonadRestrict Flat (Restrictings Aggregated q)

Restricted MonadRestrict instance.

MonadTrans (Restrictings c)

Monad m => Monad (Restrictings c m)

Functor m => Functor (Restrictings c m)

Applicative m => Applicative (Restrictings c m)

MonadAggregate m => MonadAggregate (Restrictings c m)

Resticted MonadAggregate instance.

MonadQuery q => MonadQuery (Restrictings c q)

Restricted MonadQuery instance.

restrictings :: Monad m => m a -> Restrictings c m a

Lift to Restrictings

Result

extractRestrict :: (Monad m, Functor m) => Restrictings c m a -> m (a, QueryRestriction c)

Run Restrictings to get QueryRestriction