graphql-nested-schema-example

1. Build GraphQL server using `express-graphql` package.
2. Configure `schema.js` file.
3. Query for data.

graphql: command-line-request

curl -XPOST -H "Content-Type:application/graphql"  -d '
query RootQuery {
  project(id: 2) {
    name
  }
  projects {
    id
    name
    members {
      id
      name
      tickets {
        message
      }
    }
  }
}' http://localhost:4444/graphql

graphql: schema.js

import {
  GraphQLSchema,
  GraphQLObjectType,
  GraphQLString,
  GraphQLInt,
  GraphQLList,
  GraphQLID,
  GraphQLNonNull
} from 'graphql/type';

const TicketType = new GraphQLObjectType({
  name: 'TicketType',
  fields: {
    id: {
      type: GraphQLString
    },
    message: {
      type: GraphQLString
    }
  }
});

const MemberType = new GraphQLObjectType({
  name: 'MemberType',
  fields: {
    id: {
      type: GraphQLInt
    },
    name: {
      type: GraphQLString
    },
    tickets: {
      type: new GraphQLList(TicketType),
      resolve(member) {
        return [
          {id: 1, message: `Member: ${member.id}, Ticket: 1`},
          {id: 2, message: `Member: ${member.id}, Ticket: 2`}
        ];
      }
    }
  }
});

const ProjectType = new GraphQLObjectType({
  name: 'ProjectType',
  fields: {
    id: {
      type: GraphQLInt
    },
    name: {
      type: GraphQLString
    },
    members: {
      type: new GraphQLList(MemberType),
      resolve(project) {
        return [
          {id: 1, name: `Project: ${project.id}, Member: 1`},
          {id: 2, name: `Project: ${project.id}, Member: 2`}
        ];
      }
    }
  }
});

const RootType = new GraphQLObjectType({
  name: 'RootType',
  fields: {
    projects: {
      type: new GraphQLList(ProjectType),
      resolve() {
        return [
          {id: 1, name: `Project 1`},
          {id: 2, name: `Project 2`}
        ];
      }
    },
    project: {
      type: ProjectType,
      args: {
        id: {
          type: new GraphQLNonNull(GraphQLID)
        }
      },
      resolve(parent, {id}) {
        return {id: id, name: `Project ${id}`}
      }
    }
  }
});

const schema = new GraphQLSchema({
  query: RootType
});

export default schema;

graphql: server-response

{
  "data": {
    "projects": [
      {
        "id": 1,
        "name": "Project 1",
        "members": [
          {
            "id": 1,
            "name": "Project: 1, Member: 1",
            "tickets": [
              {
                "id": "1",
                "message": "Member: 1, Ticket: 1"
              },
              {
                "id": "2",
                "message": "Member: 1, Ticket: 2"
              }
            ]
          },
          {
            "id": 2,
            "name": "Project: 1, Member: 2",
            "tickets": [
              {
                "id": "1",
                "message": "Member: 2, Ticket: 1"
              },
              {
                "id": "2",
                "message": "Member: 2, Ticket: 2"
              }
            ]
          }
        ]
      },
      {
        "id": 2,
        "name": "Project 2",
        "members": [
          {
            "id": 1,
            "name": "Project: 2, Member: 1",
            "tickets": [
              {
                "id": "1",
                "message": "Member: 1, Ticket: 1"
              },
              {
                "id": "2",
                "message": "Member: 1, Ticket: 2"
              }
            ]
          },
          {
            "id": 2,
            "name": "Project: 2, Member: 2",
            "tickets": [
              {
                "id": "1",
                "message": "Member: 2, Ticket: 1"
              },
              {
                "id": "2",
                "message": "Member: 2, Ticket: 2"
              }
            ]
          }
        ]
      }
    ]
  }
}

Hi Kristijan, I am trying to learn GraphQL and need some help. Using your code, I wanted to embed Members inside Projects (subdocument) and then connect them to Tickets. Also I wanted to use discriminator feature for two types of Tickets. But I am not able to resolve Tickets. If I send you my zip file, can you tell me what I am doing wrong? Thanks in advance ... it might take just a few minutes of your time, but it would really help me a lot. Warm Regards, Narayanan

Thank you for sharing this - it is helpful.