mongoose-relay-connection

Easiest and lightweight way to create a Relay Connection from Mongoose query for paginate thru.

Install

npm i mongoose-relay-connection --save

Use

Import connectionFromMongooseQuery function from package to file with your Relay Connection definition:

import connectionFromMongooseQuery from 'mongoose-relay-connection'

Use it inside resolver of your connection (don't forget to await!):

const PostsConnection = {
  type: PostsConnectionType,
  args: connectionArgs,
  resolve: async (relayRoot, args) => {
    const query = Post.find()
    return await connectionFromMongooseQuery(query, args)
  }
}

Example

Full working example could look like so:

import { GraphQLInt, GraphQLList } from 'graphql'
import { connectionArgs, connectionDefinitions } from 'graphql-relay'
import GraphQLPost from 'projectRoot/data/schema/types/GraphQLPost'
import Post from 'projectRoot/data/models/Post'
import connectionFromMongooseQuery from 'mongoose-relay-connection'

const { connectionType: PostsConnectionType } = connectionDefinitions({
  name: 'Posts',
  nodeType: GraphQLPost,
  connectionFields: () => ({
    totalCount: {
      type: GraphQLInt,
      resolve: connection => connection.totalCount
    },
    posts: {
      type: new GraphQLList(GraphQLPost),
      resolve: connection => connection.edges.map(edge => edge.node)
    }
  })
})

const PostsConnection = {
  type: PostsConnectionType,
  args: connectionArgs,
  resolve: async (relayRoot, args) => {
    const query = Post.find() // Here you can add any filtering or sorting to your query
    return await connectionFromMongooseQuery(query, args)
  }
}