CreatePost.js

import Relay from 'react-relay'

export default class CreatePostMutation extends Relay.Mutation {
  static fragments = {
    viewer: () => Relay.QL`
      fragment on User {
        id
        allPosts(first:10) {
          edges {
            node {
              id
            }
          }
        }
      }
    `,
  };
  getMutation() {
    return Relay.QL`mutation{createPost}`;
  }
  getFatQuery() {
    return Relay.QL`
      fragment on CreatePostPayload {
        postEdge
        viewer {
          id
        }
      }
    `;
  }
  getConfigs() {
    return [{
      type: 'RANGE_ADD',
      parentName: 'viewer',
      parentID: this.props.viewer.id,
      connectionName: 'allPosts',
      edgeName: 'postEdge',
      rangeBehaviors: {
        '': 'append',
      },
    }];
  }
  getVariables() {
    return {
      title: this.props.title,
      body: this.props.body,
      created_at: this.props.created_at,
    };
  }
}