具有自定义标量类型的GraphQL.js突变

Question

我在GraphQL中有一个基于GeoJSON的API，我试图在上进行突变。我正在使用graphql-geojson中的一些类型。输入类型和突变的定义如下：

# ... from graphql-geojson ... 
var CoordinatesScalar = new ScalarType({ 
name: 'GeoJSONCoordinates', 
description: 'A (multidimensional) set of coordinates following x, y, z order.', 
serialize: coerceCoordinates, 
parseValue: coerceCoordinates, 
parseLiteral: parseCoordinates}) 


# ... schema.js ... 
var waypointInputType = new GraphQLInputObjectType({ 
    name: 'WaypointInput', 
    fields: {... schema.js ...] 
var waypointInputType = new GraphQLInputObjectType({ 
    name: 'WaypointInput', 
    fields: { 
    type: {type: GraphQLString}, 
    coordinates: {type: CoordinatesScalar} 
    } 
}); 
var missionInputType = new GraphQLInputObjectType({ 
    name: 'MissionInput', 
    fields:() => ({ 
    waypoints: {type: waypointInputType}, 
    max_groundspeed: {type: GraphQLFloat} 
    }) 
}); 

var createMission = { 
    type: missionType, 
    description: 'Create a new mission.', 
    args: { 
    mission: {type: missionInputType} 
    }, 
    resolve(value, {mission}) { 
    return models.Mission.create(mission).then(mission => mission); 
    } 
}; 

# ... in schema definition ... 
mutation: new GraphQLObjectType({ 
name: 'RootMutationType', 
fields: { 
    createMission 
} 
}) 

在graphiql，我喜欢发行

mutation { 
    createMission(mission: { 
    waypoints: { 
     type: "LineString", 
     coordinates: [[1, 2], [3, 4]] 
    } 
    }) { 
    id 
    } 
} 

的突变，以节省一些新的坐标和查询所创建的任务ID。但是，graphql会引发一个错误Argument mission has invalid value [...] coordinates: expected type GeoJSONCoordinates, found [[1, 2], [3, 4]]。我可以在坐标中放入任意字符串，但嵌套数组似乎不起作用。随着行情嵌套数组，我得到一个字符串回来时，我查询：

{ 
"waypoints": { 
      "type": "LineString", 
      "bbox": null, 
      "coordinates": "[[1, 2], [3, 3]]" 
     } 
} 

我可以用CoordinatesScalar为输入型，或者我需要定义CoordinatesScalar可以专门解析了输入的输入类型？

Answer 1

如果您使用完整的语法发出突变，您可以指定类型的输入：

mutation CreateMission(mission: MissonInput) { 
    createMission(mission: $mission) { 
    id 
    } 
} 

然后你就可以提供变量：

{ 
    mission: { 
    waypoints: { 
     type: "LineString", 
     coordinates: [[1, 2], [3, 4]] 
    } 
    } 
} 

我不知道，如果这将解决它，让我知道！ :)