[英]Showing Sub-categories on menu only if has products with Laravel
I have simple query which populate menu with Main categories and sub-categories. 我有一个简单的查询,其中包含主类别和子类别的菜单。 This work perfectly
这个工作完美
// in controller
$cat=Categories::all();
View::share('categories_menu',$cat);
// in view
@foreach($categories_menu as $category_menu)
@if($category_menu->has('subcategories'))
<ul class="nav nav-stacked cat-nav">
<li>
<a href="#">{{ $category_menu['category_name'] }} </a>
@if($category_menu->subcategories->count())
<ul>
@foreach($category_menu->subcategories as $subcategory)
<li class=""><a href="#">{{$subcategory->sub_cat_name}}</a></li>
@endforeach
</ul>
@endif
</li>
@else
<li><a href="#"><i class="fa fa-link"></i> <span>{{ $category_menu->category_name }}</span></a></li>
@endif
</ul>
@endforeach
This make output like 这使输出像
Main Category
-Sub Cat
-Sub Cat
Second main category
-Sub in second main category
...
The problem is that it is loading also sub-categories which are empty. 问题在于它还加载了空的子类别。 I don't want to show them and I tried to change the query with joining all three tables -
category
, sub_categories
, products
我不想显示它们,我尝试通过连接所有三个表(
category
, sub_categories
, products
来更改查询
This is the query so far 这是到目前为止的查询
$cat = Categories::select('*', DB::raw('category.category_id AS category_id'))
->leftJoin('products', function($join) {
$join->on('products.category_id', '=', 'category.category_id');
})
->leftJoin('sub_category', function($secondjoin){
$secondjoin->on('sub_category.category_id', '=', 'category.category_id');
})
->whereNotNull('products.sub_cat_id')
->get();
The result is strange ( image ) 结果很奇怪(图片)
It's should show me only two main categories each with one sub. 应该只显示两个主要类别,每个类别都有一个子类别。 On the image you can see my product table
在图片上您可以看到我的产品表
Category 1
-sub1
Category 2
-sub3
If need some more source or something i can provide. 如果需要更多资源或我可以提供的东西。
Update with models: 型号更新:
Categories model 类别模型
class Categories extends Eloquent {
protected $table = 'category';
protected $primaryKey = 'category_id';
public $timestamps = false;
public function products()
{
return $this->hasMany('Product', 'category_id');
}
public function subcategories()
{
return $this->hasMany('SubCategories', 'category_id');
}
}
SubCategories model 子类别模型
class SubCategories extends Eloquent {
protected $table = 'sub_category';
protected $primaryKey = 'sub_cat_id';
public $timestamps = false;
public function category()
{
return $this->belongsTo('Category', 'category_id');
}
public function products()
{
return $this->hasMany('Product', 'sub_cat_id');
}
}
Products model 产品型号
class Product extends Eloquent {
protected $table = 'products';
protected $primaryKey = 'product_id';
public function categories()
{
return $this->hasMany('Categories', 'category_id');
}
public $timestamps = false;
}
@foreach($categories_menu as $category_menu)
@if($category_menu->has('subcategories'))
<ul class="nav nav-stacked cat-nav">
<li>
<a href="#">{{ $category_menu['category_name'] }} </a>
@if($category_menu->subcategories->count())
<ul>
@foreach($category_menu->subcategories as $subcategory)
@if($subcategory->products->count())
<li class=""><a href="#">{{$subcategory->sub_cat_name}}</a></li>
@endif
@endforeach
</ul>
@endif
</li>
@else
<li><a href="#"><i class="fa fa-link"></i> <span>{{ $category_menu->category_name }}</span></a></li>
@endif
</ul>
@endforeach
I added a condition for subcatergy to be displayed only if their products count is above 0. 我添加了一个条件,即仅当其产品计数大于0时才显示子类别。
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