arvitaly / go-graphql-tools

Generator GraphQL schema from Go-structs

Generator GraphQL schema from Go-structs

#IN WORKING!

Based on https://github.com/graphql-go/graphql library

Example

Star Wars, based on https://github.com/facebook/relay/blob/master/examples/star-wars/

Query's example

query Q1{ 
		rebels{
			id 
			name
			ships{
				edges{
					node{
						id
						name
					}
				}
			}
		} 
		empire{
			id 
			name
		}				 
	}

Mutation's example

mutation M1{ introduceShip(input:{shipName:"New shippy"}){
	ship{
		id
		name
	}
} }	

Schema declaration

type Node struct {
	Id string `json:"id" "graphql:id"`
}

func (n Node) IsInterface() bool {
	return true
}

type Faction struct {
	Node  `graphql:"interface"`
	Id    string         `json:"id" "graphql:id"`
	Name  string         `json:"name"`
	Ships ShipConnection `json:"ships"`
}
type Ship struct {
	Id   string `json:"id" graphql:"id"`
	Name string `json:"name"`
}
type ShipConnection struct {
	Edges    []ShipEdge `json:"edges"`
	PageInfo *PageInfo  `json:"pageInfo"`
}

type ShipEdge struct {
	Cursor *string `json:"cursor"`
	Node   Ship    `json:"node"`
}

type PageInfo struct {
	HasNextPage     *bool  `json:"hasNextPage"`
	HasPreviousPage *bool  `json:"hasPreviousPage"`
	StartCursor     string `json:"startCursor"`
	EndCursor       string `json:"endCursor"`
}
type Query struct {
	Rebels Faction `json:"rebels"`
	Empire Faction `json:"empire"`
	Node   Node    `json:"node"`
}
type QueryNodeArgs struct {
	Id string `json:"id" graphql:"id"`
}

func (q Query) ArgsForNode() QueryNodeArgs {
	return QueryNodeArgs{}
}

type IntroduceShipInput struct {
	ClientMutationId *string `json:"clientMutationId"`
	ShipName         *string `json:"shipName"`
	FactionId        *string `json:"factionId" graphql:"id"`
}

type IntroduceShipPayload struct {
	ClientMutationId *string `json:"clientMutationId"`
	Ship             Ship    `json:"ship"`
	Faction          Faction `json:"faction"`
}

type Mutation struct {
	IntroduceShip IntroduceShipPayload `json:"introduceShip"`
}
type MutationIntroduceShipArgs struct {
	Input *IntroduceShipInput `json:"input" graphql:"input"`
}

func (m Mutation) ArgsForIntroduceShip() MutationIntroduceShipArgs {
	return MutationIntroduceShipArgs{}
}

Resolve

router.Query("Query.Rebels", func(query Query) (Faction, error) {
	return GetFaction("1"), nil
})
router.Query("Query.Empire", func(query Query) (Faction, error) {
	return GetFaction("2"), nil
})
router.Query("Faction.Ships", func(faction Faction, p tools.ResolveParams) (*relay.Connection, error) {
	return relay.ConnectionFromArray(GetShips(faction.Id), relay.NewConnectionArguments(p.Params.Args)), nil
})
router.Query("Mutation.IntroduceShip", func(m Mutation, args MutationIntroduceShipArgs) (interface{}, error) {
	return IntroduceShipPayload{
		Ship: Ship{
			Id:   nextShipId,
			Name: *args.Input.ShipName,
		},
	}, nil
})