Safe Haskell	None
Language	Haskell2010

Servant.Links

Contents

Building and using safe links
Generics
Adding custom types
- Link accessors

Description

Type safe generation of internal links.

Given an API with a few endpoints:

>>> :set -XDataKinds -XTypeFamilies -XTypeOperators
>>> import Servant.API
>>> import Servant.Links
>>> import Data.Proxy
>>> 
>>> type Hello = "hello" :> Get '[JSON] Int
>>> type Bye   = "bye"   :> QueryParam "name" String :> Delete '[JSON] NoContent
>>> type API   = Hello :<|> Bye
>>> let api = Proxy :: Proxy API

It is possible to generate links that are guaranteed to be within API with safeLink. The first argument to safeLink is a type representing the API you would like to restrict links to. The second argument is the destination endpoint you would like the link to point to, this will need to end with a verb like GET or POST. Further arguments may be required depending on the type of the endpoint. If everything lines up you will get a Link out the other end.

You may omit QueryParams and the like should you not want to provide them, but types which form part of the URL path like Capture must be included. The reason you may want to omit QueryParams is that safeLink is a bit magical: if parameters are included that could take input it will return a function that accepts that input and generates a link. This is best shown with an example. Here, a link is generated with no parameters:

>>> let hello = Proxy :: Proxy ("hello" :> Get '[JSON] Int)
>>> toUrlPiece (safeLink api hello :: Link)
"hello"

If the API has an endpoint with parameters then we can generate links with or without those:

>>> let with = Proxy :: Proxy ("bye" :> QueryParam "name" String :> Delete '[JSON] NoContent)
>>> toUrlPiece $ safeLink api with (Just "Hubert")
"bye?name=Hubert"

>>> let without = Proxy :: Proxy ("bye" :> Delete '[JSON] NoContent)
>>> toUrlPiece $ safeLink api without
"bye"

If you would like create a helper for generating links only within that API, you can partially apply safeLink if you specify a correct type signature like so:

>>> :set -XConstraintKinds
>>> :{
>>> let apiLink :: (IsElem endpoint API, HasLink endpoint)
>>> => Proxy endpoint -> MkLink endpoint Link
>>> apiLink = safeLink api
>>> :}

safeLink' allows to make specialise the output:

>>> safeLink' toUrlPiece api without
"bye"

>>> :{
>>> let apiTextLink :: (IsElem endpoint API, HasLink endpoint)
>>> => Proxy endpoint -> MkLink endpoint Text
>>> apiTextLink = safeLink' toUrlPiece api
>>> :}

>>> apiTextLink without
"bye"

Attempting to construct a link to an endpoint that does not exist in api will result in a type error like this:

>>> let bad_link = Proxy :: Proxy ("hello" :> Delete '[JSON] NoContent)
>>> safeLink api bad_link
...
...Could not deduce...
...

This error is essentially saying that the type family couldn't find bad_link under api after trying the open (but empty) type family IsElem' as a last resort.

Since: 0.14.1

Synopsis

module Servant.API.TypeLevel
safeLink :: forall endpoint api. (IsElem endpoint api, HasLink endpoint) => Proxy api -> Proxy endpoint -> MkLink endpoint Link
safeLink' :: forall endpoint api a. (IsElem endpoint api, HasLink endpoint) => (Link -> a) -> Proxy api -> Proxy endpoint -> MkLink endpoint a
allLinks :: forall api. HasLink api => Proxy api -> MkLink api Link
allLinks' :: forall api a. HasLink api => (Link -> a) -> Proxy api -> MkLink api a
data URI = URI {
- uriScheme :: String
- uriAuthority :: Maybe URIAuth
- uriPath :: String
- uriQuery :: String
- uriFragment :: String
}
data AsLink (a :: *)
fieldLink :: (IsElem endpoint (ToServantApi routes), HasLink endpoint, GenericServant routes AsApi) => (routes AsApi -> endpoint) -> MkLink endpoint Link
fieldLink' :: forall routes endpoint a. (IsElem endpoint (ToServantApi routes), HasLink endpoint, GenericServant routes AsApi) => (Link -> a) -> (routes AsApi -> endpoint) -> MkLink endpoint a
allFieldLinks :: (HasLink (ToServantApi routes), GenericServant routes (AsLink Link), ToServant routes (AsLink Link) ~ MkLink (ToServantApi routes) Link) => routes (AsLink Link)
allFieldLinks' :: forall routes a. (HasLink (ToServantApi routes), GenericServant routes (AsLink a), ToServant routes (AsLink a) ~ MkLink (ToServantApi routes) a) => (Link -> a) -> routes (AsLink a)
class HasLink endpoint where
- type MkLink endpoint (a :: *)
- toLink :: (Link -> a) -> Proxy endpoint -> Link -> MkLink endpoint a
data Link
linkURI :: Link -> URI
linkURI' :: LinkArrayElementStyle -> Link -> URI
data LinkArrayElementStyle
- = LinkArrayElementBracket
- | LinkArrayElementPlain
data Param
- = SingleParam String Text
- | ArrayElemParam String Text
- | FlagParam String
linkSegments :: Link -> [String]
linkQueryParams :: Link -> [Param]

Documentation

module Servant.API.TypeLevel

Building and using safe links

Note that URI is from the Network.URI module in the network-uri package.

safeLink Source #

Arguments

:: (IsElem endpoint api, HasLink endpoint)
=> Proxy api	The whole API that this endpoint is a part of
-> Proxy endpoint	The API endpoint you would like to point to
-> MkLink endpoint Link

Create a valid (by construction) relative URI with query params.

This function will only typecheck if endpoint is part of the API api

safeLink' Source #

Arguments

:: (IsElem endpoint api, HasLink endpoint)
=> (Link -> a)
-> Proxy api	The whole API that this endpoint is a part of
-> Proxy endpoint	The API endpoint you would like to point to
-> MkLink endpoint a

More general safeLink.

allLinks :: forall api. HasLink api => Proxy api -> MkLink api Link Source #

Create all links in an API.

Note that the api type must be restricted to the endpoints that have valid links to them.

>>> type API = "foo" :> Capture "name" Text :> Get '[JSON] Text :<|> "bar" :> Capture "name" Int :> Get '[JSON] Double
>>> let fooLink :<|> barLink = allLinks (Proxy :: Proxy API)
>>> :t fooLink
fooLink :: Text -> Link
>>> :t barLink
barLink :: Int -> Link

Note: nested APIs don't work well with this approach

>>> :kind! MkLink (Capture "nest" Char :> (Capture "x" Int :> Get '[JSON] Int :<|> Capture "y" Double :> Get '[JSON] Double)) Link
MkLink (Capture "nest" Char :> (Capture "x" Int :> Get '[JSON] Int :<|> Capture "y" Double :> Get '[JSON] Double)) Link :: *
= Char -> (Int -> Link) :<|> (Double -> Link)

allLinks' :: forall api a. HasLink api => (Link -> a) -> Proxy api -> MkLink api a Source #

More general allLinks. See safeLink'.

data URI #

Represents a general universal resource identifier using its component parts.

For example, for the URI

  foo://anonymous@www.haskell.org:42/ghc?query#frag

the components are:

Constructors

URI
Fields uriScheme :: String foo: uriAuthority :: Maybe URIAuth //anonymous@www.haskell.org:42 uriPath :: String /ghc uriQuery :: String ?query uriFragment :: String #frag

Instances

Eq URI
Instance details Defined in Network.URI Methods (==) :: URI -> URI -> Bool # (/=) :: URI -> URI -> Bool #
Data URI
Instance details Defined in Network.URI Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> URI -> c URI # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c URI # toConstr :: URI -> Constr # dataTypeOf :: URI -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c URI) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c URI) # gmapT :: (forall b. Data b => b -> b) -> URI -> URI # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> URI -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> URI -> r # gmapQ :: (forall d. Data d => d -> u) -> URI -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> URI -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> URI -> m URI # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> URI -> m URI # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> URI -> m URI #
Ord URI
Instance details Defined in Network.URI Methods compare :: URI -> URI -> Ordering # (<) :: URI -> URI -> Bool # (<=) :: URI -> URI -> Bool # (>) :: URI -> URI -> Bool # (>=) :: URI -> URI -> Bool # max :: URI -> URI -> URI # min :: URI -> URI -> URI #
Show URI
Instance details Defined in Network.URI Methods showsPrec :: Int -> URI -> ShowS # show :: URI -> String # showList :: [URI] -> ShowS #
Generic URI
Instance details Defined in Network.URI Associated Types type Rep URI :: Type -> Type # Methods from :: URI -> Rep URI x # to :: Rep URI x -> URI #
NFData URI
Instance details Defined in Network.URI Methods rnf :: URI -> () #
type Rep URI
Instance details Defined in Network.URI type Rep URI = D1 (MetaData "URI" "Network.URI" "network-uri-2.6.1.0-K75fCYvLQE41EntOQ30cqK" False) (C1 (MetaCons "URI" PrefixI True) ((S1 (MetaSel (Just "uriScheme") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 String) :: S1 (MetaSel (Just "uriAuthority") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (Maybe URIAuth))) :: (S1 (MetaSel (Just "uriPath") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 String) :: (S1 (MetaSel (Just "uriQuery") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 String) :: S1 (MetaSel (Just "uriFragment") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 String)))))

Generics

data AsLink (a :: *) Source #

A type that specifies that an API record contains a set of links.

Since: 0.14.1

Instances

GenericMode (AsLink a) Source #
Instance details Defined in Servant.Links Associated Types type (AsLink a) :- api :: Type Source #
type (AsLink a) :- api Source #
Instance details Defined in Servant.Links type (AsLink a) :- api = MkLink api a

fieldLink :: (IsElem endpoint (ToServantApi routes), HasLink endpoint, GenericServant routes AsApi) => (routes AsApi -> endpoint) -> MkLink endpoint Link Source #

Given an API record field, create a link for that route. Only the field's type is used.

data Record route = Record
    { _get :: route :- Capture "id" Int :> Get '[JSON] String
    , _put :: route :- ReqBody '[JSON] Int :> Put '[JSON] Bool
    }
  deriving (Generic)

getLink :: Int -> Link
getLink = fieldLink _get

Since: 0.14.1

fieldLink' :: forall routes endpoint a. (IsElem endpoint (ToServantApi routes), HasLink endpoint, GenericServant routes AsApi) => (Link -> a) -> (routes AsApi -> endpoint) -> MkLink endpoint a Source #

More general version of fieldLink

Since: 0.14.1

allFieldLinks :: (HasLink (ToServantApi routes), GenericServant routes (AsLink Link), ToServant routes (AsLink Link) ~ MkLink (ToServantApi routes) Link) => routes (AsLink Link) Source #

Get all links as a record.

Since: 0.14.1

allFieldLinks' :: forall routes a. (HasLink (ToServantApi routes), GenericServant routes (AsLink a), ToServant routes (AsLink a) ~ MkLink (ToServantApi routes) a) => (Link -> a) -> routes (AsLink a) Source #

More general version of allFieldLinks.

Since: 0.14.1

Adding custom types

class HasLink endpoint where Source #

Construct a toLink for an endpoint.

Associated Types

type MkLink endpoint (a :: *) Source #

Methods

toLink Source #

Arguments

:: (Link -> a)
-> Proxy endpoint	The API endpoint you would like to point to
-> Link
-> MkLink endpoint a

Instances

HasLink EmptyAPI Source #
Instance details Defined in Servant.Links Associated Types type MkLink EmptyAPI a :: Type Source # Methods toLink :: (Link -> a) -> Proxy EmptyAPI -> Link -> MkLink EmptyAPI a Source #
HasLink Raw Source #
Instance details Defined in Servant.Links Associated Types type MkLink Raw a :: Type Source # Methods toLink :: (Link -> a) -> Proxy Raw -> Link -> MkLink Raw a Source #
(HasLink a, HasLink b) => HasLink (a :<\|> b :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (a :<\|> b) a :: Type Source # Methods toLink :: (Link -> a0) -> Proxy (a :<\|> b) -> Link -> MkLink (a :<\|> b) a0 Source #
HasLink (NoContentVerb m :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (NoContentVerb m) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (NoContentVerb m) -> Link -> MkLink (NoContentVerb m) a Source #
HasLink sub => HasLink (HttpVersion :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (HttpVersion :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (HttpVersion :> sub) -> Link -> MkLink (HttpVersion :> sub) a Source #
HasLink sub => HasLink (Vault :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (Vault :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (Vault :> sub) -> Link -> MkLink (Vault :> sub) a Source #
HasLink sub => HasLink (BasicAuth realm a :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (BasicAuth realm a :> sub) a :: Type Source # Methods toLink :: (Link -> a0) -> Proxy (BasicAuth realm a :> sub) -> Link -> MkLink (BasicAuth realm a :> sub) a0 Source #
(ToHttpApiData v, HasLink sub) => HasLink (CaptureAll sym v :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (CaptureAll sym v :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (CaptureAll sym v :> sub) -> Link -> MkLink (CaptureAll sym v :> sub) a Source #
(ToHttpApiData v, HasLink sub) => HasLink (Capture' mods sym v :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (Capture' mods sym v :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (Capture' mods sym v :> sub) -> Link -> MkLink (Capture' mods sym v :> sub) a Source #
HasLink sub => HasLink (Description s :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (Description s :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (Description s :> sub) -> Link -> MkLink (Description s :> sub) a Source #
HasLink sub => HasLink (Summary s :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (Summary s :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (Summary s :> sub) -> Link -> MkLink (Summary s :> sub) a Source #
HasLink sub => HasLink (AuthProtect tag :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (AuthProtect tag :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (AuthProtect tag :> sub) -> Link -> MkLink (AuthProtect tag :> sub) a Source #
HasLink sub => HasLink (IsSecure :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (IsSecure :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (IsSecure :> sub) -> Link -> MkLink (IsSecure :> sub) a Source #
HasLink sub => HasLink (Header' mods sym a :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (Header' mods sym a :> sub) a :: Type Source # Methods toLink :: (Link -> a0) -> Proxy (Header' mods sym a :> sub) -> Link -> MkLink (Header' mods sym a :> sub) a0 Source #
(KnownSymbol sym, HasLink sub) => HasLink (QueryFlag sym :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (QueryFlag sym :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (QueryFlag sym :> sub) -> Link -> MkLink (QueryFlag sym :> sub) a Source #
(KnownSymbol sym, ToHttpApiData v, HasLink sub) => HasLink (QueryParams sym v :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (QueryParams sym v :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (QueryParams sym v :> sub) -> Link -> MkLink (QueryParams sym v :> sub) a Source #
(KnownSymbol sym, ToHttpApiData v, HasLink sub, SBoolI (FoldRequired mods)) => HasLink (QueryParam' mods sym v :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (QueryParam' mods sym v :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (QueryParam' mods sym v :> sub) -> Link -> MkLink (QueryParam' mods sym v :> sub) a Source #
HasLink sub => HasLink (RemoteHost :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (RemoteHost :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (RemoteHost :> sub) -> Link -> MkLink (RemoteHost :> sub) a Source #
HasLink sub => HasLink (ReqBody' mods ct a :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (ReqBody' mods ct a :> sub) a :: Type Source # Methods toLink :: (Link -> a0) -> Proxy (ReqBody' mods ct a :> sub) -> Link -> MkLink (ReqBody' mods ct a :> sub) a0 Source #
HasLink sub => HasLink (StreamBody' mods framing ct a :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (StreamBody' mods framing ct a :> sub) a :: Type Source # Methods toLink :: (Link -> a0) -> Proxy (StreamBody' mods framing ct a :> sub) -> Link -> MkLink (StreamBody' mods framing ct a :> sub) a0 Source #
(KnownSymbol sym, HasLink sub) => HasLink (sym :> sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (sym :> sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (sym :> sub) -> Link -> MkLink (sym :> sub) a Source #
HasLink sub => HasLink (WithNamedContext name context sub :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (WithNamedContext name context sub) a :: Type Source # Methods toLink :: (Link -> a) -> Proxy (WithNamedContext name context sub) -> Link -> MkLink (WithNamedContext name context sub) a Source #
HasLink (Verb m s ct a :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (Verb m s ct a) a :: Type Source # Methods toLink :: (Link -> a0) -> Proxy (Verb m s ct a) -> Link -> MkLink (Verb m s ct a) a0 Source #
HasLink (Stream m status fr ct a :: Type) Source #
Instance details Defined in Servant.Links Associated Types type MkLink (Stream m status fr ct a) a :: Type Source # Methods toLink :: (Link -> a0) -> Proxy (Stream m status fr ct a) -> Link -> MkLink (Stream m status fr ct a) a0 Source #

data Link Source #

A safe link datatype. The only way of constructing a Link is using safeLink, which means any Link is guaranteed to be part of the mentioned API.

Instances

Show Link Source #
Instance details Defined in Servant.Links Methods showsPrec :: Int -> Link -> ShowS # show :: Link -> String # showList :: [Link] -> ShowS #
ToHttpApiData Link Source #
Instance details Defined in Servant.Links Methods toUrlPiece :: Link -> Text # toEncodedUrlPiece :: Link -> Builder # toHeader :: Link -> ByteString # toQueryParam :: Link -> Text #

linkURI :: Link -> URI Source #

Transform Link into URI.

>>> type API = "something" :> Get '[JSON] Int
>>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API)
something

>>> type API = "sum" :> QueryParams "x" Int :> Get '[JSON] Int
>>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
sum?x[]=1&x[]=2&x[]=3

>>> type API = "foo/bar" :> Get '[JSON] Int
>>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API)
foo%2Fbar

>>> type SomeRoute = "abc" :> Capture "email" String :> Put '[JSON] ()
>>> let someRoute = Proxy :: Proxy SomeRoute
>>> safeLink someRoute someRoute "test@example.com"
Link {_segments = ["abc","test%40example.com"], _queryParams = []}

>>> linkURI $ safeLink someRoute someRoute "test@example.com"
abc/test%40example.com

linkURI' :: LinkArrayElementStyle -> Link -> URI Source #

Configurable linkURI.

>>> type API = "sum" :> QueryParams "x" Int :> Get '[JSON] Int
>>> linkURI' LinkArrayElementBracket $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
sum?x[]=1&x[]=2&x[]=3

>>> linkURI' LinkArrayElementPlain $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
sum?x=1&x=2&x=3

data LinkArrayElementStyle Source #

How to encode array query elements.

Constructors

LinkArrayElementBracket	foo[]=1&foo[]=2
LinkArrayElementPlain	foo=1&foo=2

Instances

Bounded LinkArrayElementStyle Source #
Instance details Defined in Servant.Links Methods minBound :: LinkArrayElementStyle # maxBound :: LinkArrayElementStyle #
Enum LinkArrayElementStyle Source #
Instance details Defined in Servant.Links Methods succ :: LinkArrayElementStyle -> LinkArrayElementStyle # pred :: LinkArrayElementStyle -> LinkArrayElementStyle # toEnum :: Int -> LinkArrayElementStyle # fromEnum :: LinkArrayElementStyle -> Int # enumFrom :: LinkArrayElementStyle -> [LinkArrayElementStyle] # enumFromThen :: LinkArrayElementStyle -> LinkArrayElementStyle -> [LinkArrayElementStyle] # enumFromTo :: LinkArrayElementStyle -> LinkArrayElementStyle -> [LinkArrayElementStyle] # enumFromThenTo :: LinkArrayElementStyle -> LinkArrayElementStyle -> LinkArrayElementStyle -> [LinkArrayElementStyle] #
Eq LinkArrayElementStyle Source #
Instance details Defined in Servant.Links Methods (==) :: LinkArrayElementStyle -> LinkArrayElementStyle -> Bool # (/=) :: LinkArrayElementStyle -> LinkArrayElementStyle -> Bool #
Ord LinkArrayElementStyle Source #
Instance details Defined in Servant.Links Methods compare :: LinkArrayElementStyle -> LinkArrayElementStyle -> Ordering # (<) :: LinkArrayElementStyle -> LinkArrayElementStyle -> Bool # (<=) :: LinkArrayElementStyle -> LinkArrayElementStyle -> Bool # (>) :: LinkArrayElementStyle -> LinkArrayElementStyle -> Bool # (>=) :: LinkArrayElementStyle -> LinkArrayElementStyle -> Bool # max :: LinkArrayElementStyle -> LinkArrayElementStyle -> LinkArrayElementStyle # min :: LinkArrayElementStyle -> LinkArrayElementStyle -> LinkArrayElementStyle #
Show LinkArrayElementStyle Source #
Instance details Defined in Servant.Links Methods showsPrec :: Int -> LinkArrayElementStyle -> ShowS # show :: LinkArrayElementStyle -> String # showList :: [LinkArrayElementStyle] -> ShowS #

Link accessors

data Param Source #

Query parameter.

Constructors

SingleParam String Text
ArrayElemParam String Text
FlagParam String

Instances

Show Param Source #
Instance details Defined in Servant.Links Methods showsPrec :: Int -> Param -> ShowS # show :: Param -> String # showList :: [Param] -> ShowS #

linkSegments :: Link -> [String] Source #

linkQueryParams :: Link -> [Param] Source #