Followables

CanBeFollowed.php

<?php

namespace App;

trait CanBeFollowed
{
    public function isFollowedBy($user)
    {
        if ($this->relationLoaded('followers')) {
            return $this->followers->first(function ($follower) use ($user) {
                    return $follower->is($user);
                }) !== null;
        }

        return $this->followers()->where('user_id', $user->id)->exists();
    }

    public function followers()
    {
        return $this->morphToMany(User::class, 'followable', 'followables')->withPivot('created_at');
    }
}

CanFollow.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

trait CanFollow
{
    public function follow($followable)
    {
        return $this->followings(get_class($followable))->syncWithoutDetaching([
            $followable->id => ['created_at' => now()],
        ]);
    }

    public function unfollow($followable)
    {
        return $this->followings()->detach($followable);
    }

    public function isFollowing($followable)
    {
        if ($this->relationLoaded('followings')) {
            return $this->followings->first(function ($following) use ($followable) {
                    return $following->is($followable);
                }) !== null;
        }

        return $this->followings()
            ->where('followable_id', $followable->id)
            ->where('followable_type', get_class($followable))
            ->exists();
    }

    public function followings($class = User::class)
    {
        return $this->morphedByMany($class, 'followable', 'followables');
    }
}

followable_table.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateFollowablesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('followables', function (Blueprint $table) {
            $table->unsignedBigInteger('user_id')->index();
            $table->morphs('followable');
            $table->timestamp('created_at')->nullable();

            $table->primary(['user_id', 'followable_type', 'followable_id']);
            $table->index(['followable_type', 'followable_id', 'user_id']);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('followables');
    }
}