laravel eloquent relationships between 3 model - laravel

Question

actually i have two kind of users which has two different table (user and seller table).
i have comment table with this fields:
Schema::create('comments', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id')->unsigned()->nullable();
$table->foreign('user_id')->references('id')->on('users');
$table->integer('parent_id')->unsigned()->default(0);
$table->text('comment_text');
$table->integer('commentable_id')->unsigned();
$table->string('commentable_type');
$table->timestamps();
});
how can I add seller_id to this table? if seller wants to response to a user comment.
same issue for message table.

Answer 1

Actually the good practice is you must add a role field in the user table that determines the user is a user or seller. But if you want to keep your table like that you don't need to add seller_id, just use one to many polymorphic relations. Change your comments table schema like this :
Schema::create('comments', function (Blueprint $table) {
$table->increments('id');
$table->integer('parent_id')->unsigned()->default(0);
$table->text('comment_text');
$table->integer('commentable_id')->unsigned();
$table->string('commentable_type');
$table->timestamps();
});
Then in the user and seller model, you must add the relationship method like this :
public function comments()
{
return $this->morphMany('App\Comment', 'commentable');
}
And in the comment model like this :
public function commentable()
{
return $this->morphTo();
}
Then you can get the seller comment like this :
$seller = App\Seller::find(1);
$seller->comments;
And to save the comment from the seller you can use this :
$seller = App\Seller::find(1);
$comment = $seller->comments()->create([
'comment_text' => 'A new comment.',
// Add other field
]);