Many to Many relationship query. Laravel - php

Question

I'm trying to figure out how I can do a query within a query. (if that even makes sense) I want to grab all the activities. For each activity I want to get the count of users that did the activity. Then I want to order all the activities in DESC order based on the amount of users that did each activity. I'm basically making a "Popular Activities Page" where I show the all activities starting with the activity done by the most users.
I have 3 main tables for this
users
| id | name | password | email | created_at |
activities
| id | title | description | created_at |
resource This is a table I'm using for posts which shows which user did which activity. (Users can show what activities they did, and attach media and locations to the post)
| id | user_id | activity_id | media_id | location_id | created_at |
Here are my models for each table
User Model
class User extends Eloquent {
protected $table = 'users';
/**
* get the activities associated with the given user
* #return mixed
*/
public function activities()
{
return $this->belongsToMany('Acme\Activities\Activity', 'resource', 'activity_id');
}
public function posts(){
return $this->hasMany('Acme\Resource\Resource');
}
public function media()
{
return $this->hasMany('Acme\Media\Media');
}
public function locations()
{
return $this->hasMany('Acme\Locations\Location');
}
}
Activity Model
class Activity extends Eloquent {
protected $table = 'activities';
public function posts(){
return $this->hasMany('Acme\Resource\Resource', 'resource_id');
}
/**
* get the users associated with the given activity card
* #return mixed
*/
public function users()
{
return $this->belongsToMany('Acme\Users\User', 'resource', 'user_id');
}
}
Resource Model
class Resource extends Eloquent {
protected $table = 'resource';
public function user()
{
return $this->belongsTo('Acme\Users\User', 'user_id');
}
public function activities()
{
return $this->belongsTo('Acme\Activities\Activity', 'activity_id');
}
public function media()
{
return $this->hasMany('Acme\Media\Media', 'media_id');
}
public function locations()
{
return $this->belongsTo('Acme\Locations\Location', 'location_id');
}
}
I know I can get all activities using
Activity::get()
I can get a user count for a specific activity using
User::whereHas('resource', function($q) use ($activity_id){
$q->where('activity_id', $activity_id);
})->get()->count();
but I don't know how I can put all of this together in order to get all Activities sorted by user count, starting with the activity with the highest user count.
How would I make this query using eloquent?
Thanks in advance!

Answer 1

try
Resource::select(DB::raw('*, COUNT(distinct(user_id)) as user_count'))->group_by('activity_id')->order_by('user_count', 'desc')->get();
You could then do this
$results = Resource::select(DB::raw('*, COUNT(distinct(user_id)) as user_count'))->group_by('activity_id')->order_by('user_count', 'desc')->get();
foreach ($results as $result) {
$activity = Activity::where('id','=',$result->activity_id)->first();
// do stuff to display data for this activity like
// $activity->title or $activity->description
$count = $result->user_count;
}