How to manage cursors and sorting in Relay?

Question

We have a graphql server (not written in javascript) serving a paginated list of objects. We\'re trying to conform to the relay specification, but we\'ve hit an interesting case

Answer 1

I had the same problem. So, I decided to write a npm package to handle this issue.

You can use fast-relay-pagination npm package for sorting, backward and forward pagination and filter Mongoose model or MongoDB object.

This package improves graphql-relay lazy loading by using Mongoose or MongoDB find and limit. As you definitely know, graphql-relay's connectionFromArray fetchs all data and performs slicing on data, which is not efficient for large amount.

---

You can see an example in below:

...
import {
  fetchConnectionFromArray
} from 'fast-relay-pagination'
...
export default{
  type: orderConnection.connectionType,
  args: {
    ...connectionArgs,
    orderFieldName: {
      type: GraphQLString,
    },
    sortType: {
      type: GraphQLInt,
    },
  },
  resolve: needAdmin(async (_, args) => {
    let orderFieldName = args.orderFieldName || '_id'
    let sortType = args.sortType || -1
    let after = args.after
    let before = args.before
    let filter = args.filter
    let first = args.first
    let last = args.last
    return fetchConnectionFromArray({
      dataPromiseFunc: SampleModel.find.bind(SampleModel), // required
      filter, // optional (for using filter on model collection) - for example => {username: 'test'} 
      after, //optiona
      before, // optional
      first, //optional
      last, // optional
      orderFieldName, // optional
      sortType, // optional
    })
  }),
}