requests // $asset->isRequestedBy($user) // $asset->whereRequestedBy($user) trait Requestable { public function requests() { return $this->morphMany(CheckoutRequest::class, 'requestable'); } public function isRequestedBy(User $user) { return $this->requests() ->where('user_id', $user->id) ->exists(); } public function scopeRequestedBy($query, User $user) { return $query->whereHas('requests', function ($query) use ($user) { $query->where('user_id', $user->id); }); } public function request() { $this->requests()->save( new CheckoutRequest(['user_id' => Auth::id()]) ); } public function cancelRequest() { $this->requests()->where('user_id', Auth::id())->delete(); } }