laravel Many To Many relationship with inner relation - php

Question

I have some problem to get information about item. I read a lot of information on forums stakoverflow. Maybe i can not find the correct information. Maybe someone knows about that hove to solve the problem
I have 4 tables
public function up()
{
Schema::create('db_items', function (Blueprint $table) {
$table->increments('id');
$table->timestamps();
});
}
public function up()
{
Schema::create('db_item_weapons', function (Blueprint $table) {
$table->increments('id');
$table->integer('item_id')->unsigned();
$table->foreign('item_id')
->references('id')->on('db_items')
->onDelete('cascade');
$table->integer('grade_id')->unsigned();
$table->foreign('grade_id')
->references('id')->on('db_item_grades')
->onDelete('cascade');
$table->string('hand')->nullable();
$table->string('name')->nullable();
$table->text('description')->nullable();
$table->string('icon')->nullable();
$table->string('p_atak')->nullable();
$table->timestamps();
});
}
public function up()
{
Schema::create('db_item_categories', function (Blueprint $table) {
$table->increments('id');
$table->string('name')->nullable();
$table->timestamps();
});
}
public function up()
{
Schema::create('db_item_db_item_category', function (Blueprint $table) {
$table->increments('id');
$table->integer('item_id')->unsigned()->index();
$table->foreign('item_id')
->references('id')->on('db_items')
->onDelete('cascade');
$table->integer('category_id')->unsigned()->index();
$table->foreign('category_id')
->references('id')->on('db_item_categories')
->onDelete('cascade');
$table->timestamps();
});
}
And 3 models
class DbItem extends Model
{
function weapon()
{
return $this->hasOne(DbItemWeapon::class, 'item_id');
}
function categories()
{
return $this->belongsToMany(DbItemCategory::class,'db_item_db_item_category','item_id','category_id');
}
}
class DbItemWeapon extends Model
{
function DbItem()
{
return $this->belongsTo(DbItem::class);
}
}
class DbItemCategory extends Model
{
function items()
{
return $this->belongsToMany(DbItem::class,'db_item_db_item_category','category_id','item_id')->with('weapon');
}
}
When i try to get some inforamtion it wotrks for example
#foreach($categories as $category)
<li>
<a class="uk-accordion-title" href="#">{{ $category->name }}</a>
<div class="uk-accordion-content">
#foreach( $category->items as $item)
<p>{{ $item->id }}</p>
#endforeach
</div>
</li>
#endforeach
i got the categories wtith their items and i can view the items id which contains in categoryes but if i want to see more information, its not work
$item->weapon->name

Answer 1

Maybe some of the items does not have a weapon, check for the weapon's existence first:
#foreach($categories as $category)
<li>
<a class="uk-accordion-title" href="#">{{ $category->name }}</a>
<div class="uk-accordion-content">
#foreach( $category->items as $item)
#php
$weapon = $item->weapon;
#endphp
<p>{{ $item->id }}</p>
<p>{{ $weapon ? $weapon->name : null }}</p>
#endforeach
</div>
</li>
#endforeach