servant-0.2.2: A family of combinators for defining webservices APIs

Safe HaskellSafe-Inferred
LanguageHaskell2010

Servant.API.QueryParam

Synopsis

Documentation

data QueryParam sym a Source

Lookup the value associated to the sym query string parameter and try to extract it as a value of type a.

Example:

-- /books?author=<author name>
type MyApi = "books" :> QueryParam "author" Text :> Get [Book]

data QueryParams sym a Source

Lookup the values associated to the sym query string parameter and try to extract it as a value of type [a]. This is typically meant to support query string parameters of the form param[]=val1&param[]=val2 and so on. Note that servant doesn't actually require the []s and will fetch the values just fine with param=val1&param=val2, too.

Example:

-- /books?authors[]=<author1>&authors[]=<author2>&...
type MyApi = "books" :> QueryParams "authors" Text :> Get [Book]

data QueryFlag sym Source

Lookup a potentially value-less query string parameter with boolean semantics. If the param sym is there without any value, or if it's there with value "true" or "1", it's interpreted as True. Otherwise, it's interpreted as False.

Example:

-- /books?published
type MyApi = "books" :> QueryFlag "published" :> Get [Book]