func init() {
/**
* We get the node interface and field from the relay library.
*
* The first method is the way we resolve an ID to its object. The second is the
* way we resolve an object that implements node to its type.
*/
nodeDefinitions = relay.NewNodeDefinitions(relay.NodeDefinitionsConfig{
IDFetcher: func(id string, info graphql.ResolveInfo, ctx context.Context) (interface{}, error) {
// resolve id from global id
resolvedID := relay.FromGlobalID(id)
// based on id and its type, return the object
switch resolvedID.Type {
case "Faction":
return GetFaction(resolvedID.ID), nil
case "Ship":
return GetShip(resolvedID.ID), nil
default:
return nil, errors.New("Unknown node type")
}
},
TypeResolve: func(value interface{}, info graphql.ResolveInfo) *graphql.Object {
// based on the type of the value, return GraphQLObjectType
switch value.(type) {
case *Faction:
return factionType
default:
return shipType
}
},
})
/**
* We define our basic ship type.
*
* This implements the following type system shorthand:
* type Ship : Node {
* id: String!
* name: String
* }
*/
shipType = graphql.NewObject(graphql.ObjectConfig{
Name: "Ship",
Description: "A ship in the Star Wars saga",
Fields: graphql.Fields{
"id": relay.GlobalIDField("Ship", nil),
"name": &graphql.Field{
Type: graphql.String,
Description: "The name of the ship.",
},
},
Interfaces: []*graphql.Interface{
nodeDefinitions.NodeInterface,
},
})
/**
* We define a connection between a faction and its ships.
*
* connectionType implements the following type system shorthand:
* type ShipConnection {
* edges: [ShipEdge]
* pageInfo: PageInfo!
* }
*
* connectionType has an edges field - a list of edgeTypes that implement the
* following type system shorthand:
* type ShipEdge {
* cursor: String!
* node: Ship
* }
*/
shipConnectionDefinition := relay.ConnectionDefinitions(relay.ConnectionConfig{
Name: "Ship",
NodeType: shipType,
})
/**
* We define our faction type, which implements the node interface.
*
* This implements the following type system shorthand:
* type Faction : Node {
* id: String!
* name: String
* ships: ShipConnection
* }
*/
factionType = graphql.NewObject(graphql.ObjectConfig{
Name: "Faction",
Description: "A faction in the Star Wars saga",
Fields: graphql.Fields{
"id": relay.GlobalIDField("Faction", nil),
"name": &graphql.Field{
Type: graphql.String,
Description: "The name of the faction.",
},
"ships": &graphql.Field{
Type: shipConnectionDefinition.ConnectionType,
Args: relay.ConnectionArgs,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
// convert args map[string]interface into ConnectionArguments
args := relay.NewConnectionArguments(p.Args)
// get ship objects from current faction
ships := []interface{}{}
if faction, ok := p.Source.(*Faction); ok {
for _, shipId := range faction.Ships {
ships = append(ships, GetShip(shipId))
}
}
// let relay library figure out the result, given
// - the list of ships for this faction
// - and the filter arguments (i.e. first, last, after, before)
return relay.ConnectionFromArray(ships, args), nil
},
},
},
Interfaces: []*graphql.Interface{
nodeDefinitions.NodeInterface,
},
})
/**
* This is the type that will be the root of our query, and the
* entry point into our schema.
*
* This implements the following type system shorthand:
* type Query {
* rebels: Faction
* empire: Faction
* node(id: String!): Node
* }
*/
queryType := graphql.NewObject(graphql.ObjectConfig{
Name: "Query",
Fields: graphql.Fields{
"rebels": &graphql.Field{
Type: factionType,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
return GetRebels(), nil
},
},
"empire": &graphql.Field{
Type: factionType,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
return GetEmpire(), nil
},
},
"node": nodeDefinitions.NodeField,
},
})
/**
* This will return a GraphQLField for our ship
* mutation.
*
* It creates these two types implicitly:
* input IntroduceShipInput {
* clientMutationID: string!
* shipName: string!
* factionId: ID!
* }
*
* input IntroduceShipPayload {
* clientMutationID: string!
* ship: Ship
* faction: Faction
* }
*/
shipMutation := relay.MutationWithClientMutationID(relay.MutationConfig{
Name: "IntroduceShip",
InputFields: graphql.InputObjectConfigFieldMap{
"shipName": &graphql.InputObjectFieldConfig{
Type: graphql.NewNonNull(graphql.String),
},
"factionId": &graphql.InputObjectFieldConfig{
Type: graphql.NewNonNull(graphql.ID),
},
},
OutputFields: graphql.Fields{
"ship": &graphql.Field{
Type: shipType,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
if payload, ok := p.Source.(map[string]interface{}); ok {
return GetShip(payload["shipId"].(string)), nil
}
return nil, nil
},
},
"faction": &graphql.Field{
Type: factionType,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
if payload, ok := p.Source.(map[string]interface{}); ok {
return GetFaction(payload["factionId"].(string)), nil
}
return nil, nil
},
},
},
MutateAndGetPayload: func(inputMap map[string]interface{}, info graphql.ResolveInfo, ctx context.Context) (map[string]interface{}, error) {
// `inputMap` is a map with keys/fields as specified in `InputFields`
// Note, that these fields were specified as non-nullables, so we can assume that it exists.
shipName := inputMap["shipName"].(string)
factionId := inputMap["factionId"].(string)
// This mutation involves us creating (introducing) a new ship
newShip := CreateShip(shipName, factionId)
// return payload
return map[string]interface{}{
"shipId": newShip.ID,
"factionId": factionId,
}, nil
},
})
/**
* This is the type that will be the root of our mutations, and the
* entry point into performing writes in our schema.
*
* This implements the following type system shorthand:
* type Mutation {
* introduceShip(input IntroduceShipInput!): IntroduceShipPayload
* }
*/
mutationType := graphql.NewObject(graphql.ObjectConfig{
Name: "Mutation",
Fields: graphql.Fields{
"introduceShip": shipMutation,
},
})
/**
* Finally, we construct our schema (whose starting query type is the query
* type we defined above) and export it.
*/
var err error
Schema, err = graphql.NewSchema(graphql.SchemaConfig{
Query: queryType,
Mutation: mutationType,
})
if err != nil {
// panic if there is an error in schema
panic(err)
}
}
"1": &user{1, "John Doe"},
"2": &user{2, "Jane Smith"},
}
var globalIDTestPhotoData = map[string]*photo2{
"1": &photo2{1, 300},
"2": &photo2{2, 400},
}
// declare types first, define later in init()
// because they all depend on nodeTestDef
var globalIDTestUserType *graphql.Object
var globalIDTestPhotoType *graphql.Object
var globalIDTestDef = relay.NewNodeDefinitions(relay.NodeDefinitionsConfig{
IDFetcher: func(globalID string, info graphql.ResolveInfo, ctx context.Context) (interface{}, error) {
resolvedGlobalID := relay.FromGlobalID(globalID)
if resolvedGlobalID == nil {
return nil, errors.New("Unknown node id")
}
switch resolvedGlobalID.Type {
case "User":
return globalIDTestUserData[resolvedGlobalID.ID], nil
case "Photo":
return globalIDTestPhotoData[resolvedGlobalID.ID], nil
default:
return nil, errors.New("Unknown node type")
}
},
TypeResolve: func(value interface{}, info graphql.ResolveInfo) *graphql.Object {
switch value.(type) {