src/hooks/populate-user.js


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// Use this hook to manipulate incoming or outgoing data.
// For more information on hooks see: http://docs.feathersjs.com/api/hooks.html

module.exports = function (options = {}) { // eslint-disable-line no-unused-vars
  return async context => {
    // Get `app`, `method`, `params` and `result` from the hook context
    const {app, method, result, params} = context;

    // Make sure that we always have a list of posts either by wrapping
    // a single post into an array or by getting the `data` from the `find` method's result
    const posts = method === 'find' ? result.data : [result];

    // Asynchronously get user object from each post's `userId`
    // and add it to the post
    await Promise.all(posts.map(async post => {
      // Also pass the original `params` to the service call
      // so that it has the same information available (e.g. who is requesting it)
      post.user = await app.service('users').get(post.userId, params);
    }));

    // Best practice: hooks should always return the context
    return context;
  };
};