GraphQL is exploding in popularity for Javascript applications, but it works equally well in the type-safe world of Elm. The elm-graphql node binary will introspect a GraphQL endpoint, read your .graphql file, and generate a tidy Elm module you can use anywhere in your application.
elm-graphql will recommend you install jahewson/elm-graphql-module, but at this time it is not updated for Elm 0.18. Instead, you should install base-dev/elm-graphql-module until the official version is updated.
Examples
StarWars.graphql
query queryFriends($id: String!) {
human(id: $id) {
name
home_planet
appears_in
friends {
id
name
}
}
}
StarWars.elm
queryFriends :
{ id : String
}
-> Task Http.Error QueryFriends
queryFriends params =
let
graphQLQuery =
"""query queryFriends($id: String!) { human(id: $id) { name home_planet appears_in friends { id name } } }"""
in
let
graphQLParams =
Json.Encode.object
[ ( "id", Json.Encode.string params.id )
]
in
GraphQL.query "GET" endpointUrl graphQLQuery "queryFriends" graphQLParams queryFriendsDecoder
Links