feathers-populate-hook

Feathers hook to populate multiple fields with one to many, many to one and many to many relations. (For m:m cascade the populate hooks on a linking service.)

Installation:

npm install feathers-populate-hook

Example setup:

 const populate = require('feathers-populate-hook');

 messageService.before({
   all: [
     populate.compatibility()
   ]
 });

 messageService.after({
   find: [
     populate({
       user: { // Destination key
         service: 'users', // Foreign service
         f_key: 'id',  // Foreign key
         one: true // Optional, if only one resolve object is wanted
       },
       comments: { // Destination key
         service: 'comments', // Foreign service
         f_key: 'message',  // Foreign key
         l_key: 'id',  // Local key
        },
       resolvedCategories: { // Destination key
         service: 'categories', // Foreign service
         f_key: 'id',  // Foreign key
         l_key: 'categories' // Local key, optional, if different then destination key
       },
        creator: { // Destination key
          service: 'users', // Foreign service
          f_key: 'email',  // Foreign key
          l_key: 'createdByEmail',
          one: true,
          query:  {  // defaults to {} but you can specify any other options here
            $select: ['name','profile_image']
          }
        }
     },
     { // defaults query/params
       query: {
         $foo: true
       },
       params: {
         $bar: true
       } 
     })
   ]
 })

Query options

Set query defaults for the internal service call, i.e. $select, $order

Block some populates from the client: set query.$populate to {dontPopulateField: 0}

Block all populates: set query.$populate to false or 0

You can also use $populate as a param.

Remove populate.compatibility() hook to disallow the query to modify the behaviour.

Disable populate by default

If you want the default behaviour to be false add a custom hook:

function(hook) {
  hook.params.$populate = !!hook.params.query.$populate;
  delete hook.params.query.$populate;
  return hook;
};