Relationship between 4 tables Laravel 5.1 - php

Question

I need to show feeds with total comments, and total likes on that feed with the detail of users who have commented.
Feeds Table
| id | movie_id | user_id | description |
|----|----------|----------|-------------|
| 1 | 1 | 1 | Lorem Ipsum |
Comments Table
| id | feed_id | user_id | comment |
|----|-------- |----------|-----------|
| 1 | 1 | 2 | comment 1 |
| 2 | 1 | 3 | comment 2 |
Likes Table
| id | feed_id | user_id |
|----|-------- |----------|
| 1 | 1 | 2 |
| 2 | 1 | 3 |
Users Table
| id | username| email |
|----|-------- |--------|
| 1 | a | a#a.com|
| 2 | b | b#b.com|
| 3 | c | c#c.com|
Relations
Feed.php
public function user () {
return $this->belongsTo('App\User');
}
public function likes () {
return $this->hasMany('App\Like');
}
public function comments () {
return $this->hasMany('App\Comment');
}
User.php
public function feeds () {
return $this->belongsToMany('App\Feed');
}
public function like () {
return $this->belongsTo('App\Like');
}
public function comment () {
return $this->belongsTo('App\Comment');
}
Like.php
public function user () {
return $this->belongsTo('App\User');
}
public function feed () {
return $this->belongsTo('App\Feed');
}
Comment.php
public function user () {
return $this->belongsTo('App\User');
}
public function feed () {
return $this->belongsTo('App\Feed');
}
Now I need to fetch all feeds (I have done with this), with comments count, likes count, and users details who have commented.
Ho can I get that in single query using Eloquent.

Answer 1

Try this
$commentsCount = \App\Models\Comment::select('feed_id',\DB::raw('count(id) as comments_count'))->groupBy('feed_id')->toSql();
$likesCount = \App\Models\Like::select('feed_id',\DB::raw('count(id) as likes_count'))->groupBy('feed_id')->toSql();
$records = \DB::table('feeds as f')
->leftJoin('comments as c','f.id','=','c.feed_id')
->leftJoin('users as u','c.user_id','=','u.id')
->leftJoin(\DB::raw('('.$commentsCount.') as k'),'f.id','=','k.feed_id')
->leftJoin(\DB::raw('('.$likesCount.') as l'),'f.id','=','l.feed_id')
->select('f.id as fid','f.description','u.id as uid','u.name','u.email','k.comments_count','l.likes_count')
->orderBy('fid')
->get();
$transform = function(array $records){
$records = collect($records)->groupBy('fid');
return $records->transform(function($items){
$feed['id'] = $items->first()->fid;
$feed['description'] = $items->first()->description;
$feed['count'] = [
'likes' => is_null($items->first()->likes_count) ? 0 : $items->first()->likes_count,
'comments' => is_null($items->first()->comments_count) ? 0 : $items->first()->comments_count,
];
$feed['users'] = $items->transform(function($user){
return is_null($user->uid) ? [] : ['id'=>$user->uid,'name'=>$user->name,'email'=>$user->email];
});
return $feed;
});
};
return array_values($transform($records)->toArray());
you can swap the closure function with other function. like
$this->transform($records);

Answer 2

You can simply access all those properties through the functions defined.
Example:
$feed = Feed::find($id);
foreach($feed->likes() as $like){
echo $like->user()->get('username');
}
And so forth. Up to a point when you call ->get(), you are accessing an object, which can traverse all of these.