loopback-graphql-relay/src/schema/query/index.js

Add Relay based Apollo Server or GraphQL queries on your Loopback server

const _ = require('lodash');

const { GraphQLObjectType } = require('graphql');
const { getType } = require('../../types/type');
const getRemoteMethodQueries = require('./getRemoteMethodQueries');
const generateViewer = require('./viewer');

function generateModelFields(models) {
  const modelFields = {};
  _.forEach(models, (model) => {
    const fields = Object.assign(
      {},
      getRemoteMethodQueries(model),
    );

    if (_.size(fields) === 0) {
      return;
    }

    modelFields[model.modelName] = {
      resolve: () => ({}),
      type: new GraphQLObjectType({
        name: `${model.modelName}Queries`,
        description: model.modelName,
        fields,
      }),
    };
  });

  return modelFields;
}

module.exports = function (models, options) {
  const fields = Object.assign(
    {},
    {
      node: getType('node'),
      viewer: generateViewer(models, options),
    },
    generateModelFields(models),
  );

  return new GraphQLObjectType({
    name: 'Query',
    fields,
  });
};