如何在GraphQL中创建自定义对象列表

Question

I am currently playing around with a bunch of new technology of Facebook.

I have a little problem with GraphQL schemas. I have this model of an object:

{
        id: '1',
        participants: ['A', 'B'],
        messages: [
            {
                content: 'Hi there',
                sender: 'A'
            },
            {
                content: 'Hey! How are you doing?',
                sender: 'B'
            },
            {
                content: 'Pretty good and you?',
                sender: 'A'
            },
        ];
    }

Now I want to create a GraphQL model for this. I did this:

var theadType = new GraphQLObjectType({
  name: 'Thread',
  description: 'A Thread',
  fields: () => ({
    id: {
      type: new GraphQLNonNull(GraphQLString),
      description: 'id of the thread'
    },
    participants: {
      type: new GraphQLList(GraphQLString),
      description: 'Participants of thread'
    },
    messages: {
      type: new GraphQLList(),
      description: 'Messages in thread'
    }

  })
});

I know there are more elegant ways to structure the data in the first place. But for the sake of experimenting, I wanted to try it like this.

Everything works fine, besides my messages array, since I do not specify the Array type. I have to specify what kind of data goes into that array. But since it is an custom object, I don't know what to pass into the GraphQLList().

Any idea how to resolve this besides creating an own type for messages?

Answer 1

您可以使用与定义theadType相同的方式定义自己的自定义messageType ，然后执行new GraphQLList(messageType)以指定消息列表的类型。

Answer 2

I don't think you can do this in GraphQL. Think that it's a bit against GraphQL philosophy of asking for the fields "you need" in each component against asking for "them all".

When the app scales, your approach will provoque higher loads of data. I know that for the purpose of testing the library looks a bit too much but it seems this is how it is designed. Types allowed in current GraphQL library (0.2.6) are:

• GraphQLSchema
• GraphQLScalarType
• GraphQLObjectType
• GraphQLInterfaceType
• GraphQLUnionType
• GraphQLEnumType
• GraphQLInputObjectType
• GraphQLList
• GraphQLNonNull
• GraphQLInt
• GraphQLFloat
• GraphQLString
• GraphQLBoolean
• GraphQLID