Store Comments in DB - php

Question

I am looking for a solution for storing comments in the database, but it is not difficult at all:
In one table wants to write comments from several modules on the website.
I am currently creating a table using code 'comments table':
public function up()
{
Schema::create('comments', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id')->unsigned();
$table->integer('module_id')->unsigned();
$table->integer('parent_id')->unsigned();
$table->text('body');
$table->timestamps();
});
}
Comments modules table:
public function up()
{
//
Schema::create('comment_module',function (Blueprint $table){
$table->increments('id');
$table->string('title',190);
$table->string('name',190)->unique();
$table->text('body');
$table->timestamps();
});
}
for now everything is okay, but i have problem with select all comments for each blog post,gallery, etc..
blog, gallery - name of modules.
code for Map.php model
public function comments(){
return $this->hasMany(Comment::class,'module_id');
}
CommentModule.php model
public function comments(){
return $this->hasMany(Comment::class,'module_id');
}
Comment.php
public function module(){
return $this->belongsTo(CommentModule::class);
}
and now how to pass a 'mmodule_id' ?
normal use with any relationships for one table will be like that:
$map->comments->body . . etc.
but for that construction don`t work, yes of course i can use raw query and use join, right ?
Is any option to use a Eloquent?

Answer 1

IMHO for what I understood you want to attach comments to more than one Eloquent Model. There is a clean example in the laravel docs with Polymorphic Relations
As summary you have to add two fields on the comments table: commentable_id(integer) and commentable_type (string).
After that you declare the relation on the Comment model:
public function commentable()
{
return $this->morphTo();
}
And you can use the comments() relation in each model you want to attach comments, i.e.:
class Post extends Model
{
public function comments()
{
return $this->morphMany('App\Comment', 'commentable');
}
class Map extends Model
{
public function comments()
{
return $this->morphMany('App\Comment', 'commentable');
}
Now you can retrieve comments as usual:
$post->comments;
To attach a new comment to a parent:
$post->comments()->create([array of comment attributes]);