Omiting foreach loop through laravel collection

Question

I'm having a small conditional loop in my application built on Laravel 5.5, I'm learning collections which seems to be amazing when I know more, currently I'm having following code in my controller:

$milestone = Milestone::where('unique_id', $id)
    ->with('project.teams.users.profile')
    ->first();

//  $users = $milestone->project->pluck('teams.users');
$users = [];
foreach ($milestone->project->teams as $team)
{
    foreach($team->users as $user)
        $users[] = $user;
}

return response()->json(['users' => $users], 200);

In my code i tried $users = $milestone->project->pluck('teams.users'); is not giving me proper result, In my model milestone following is relationship:

public function project()
{
    return $this->belongsTo('App\Models\Team\Project', 'project_id');
}

In my Project relationship is:

public function teams()
{
    return $this->belongsToMany('App\Models\Team\Team', 'project_team', 'project_id', 'team_id');
}

In my Teams model:

public function users()
{
    return $this->belongsToMany('App\Models\User')->withTimestamps();
}

This might by two many to many relationship between project->teams and teams->user I'm not getting the result.

I want to omit this foreach loop through collection, Can someone guide me how to implement this through the same, Thanks

Answer 1

Laravel collections have awesome flatten() method. It flattens a multi-dimensional collection into a single dimension. So you can use pluck() and then flatten() to get users from all teams as one collection and omit foreach loop:

$users = $milestone->project->teams->pluck('users')->flatten();

It is will return all users from a single project as collection, so you will be able to loop users via each() method:

$users->each(function($user){
  //your code here
});