問題描述

我在樹中有相互關聯的類別.每個類別 hasMany 子項.每個終端類別有許多個產品.

I have categories related to each other in a tree. Each category hasMany children. Each end category hasMany products.

產品也belongsToMany 不同的類型.

我想急切地加載帶有他們的孩子和產品的類別，但我也想設置一個條件，即產品屬于某種類型.

I want to eager load the categories with their children and with the products but I also want to put a condition that the products are of a certain type.

這就是我的類別模型的樣子

This is how my categories Model looks like

public function children()
{
    return $this->hasMany('Category', 'parent_id', 'id');
}


public function products()
{
    return $this->hasMany('Product', 'category_id', 'id');
}

產品型號

public function types()
{
    return $this->belongsToMany(type::class, 'product_type');
}

在我的數據庫中，我有四個表:類別、產品、類型和產品類型

In my database I have four tables: category, product, type, and product_type

我嘗試過像這樣快速加載，但它加載了所有產品，而不僅僅是滿足條件的產品:

I've tried eager loading like so but it loads all the products and not just the ones that fulfil the condition:

$parentLineCategories = ProductCategory::with('children')->with(['products'=> function ($query) {
        $query->join('product_type', 'product_type.product_id', '=', 'product.id')
            ->where('product_type.type_id', '=', $SpecificID);
    }]])->get();

推薦答案

代替當前查詢，嘗試這是否符合您的需要.(我根據您的評論修改了我的答案如下)

Instead of the current query, try if this fits your needs. (I modified my answer as follows with your comment)

$parentLineCategories = ProductCategory::with([
            'children' => function ($child) use ($SpecificID) {
                return $child->with([
                    'products' => function ($product) use ($SpecificID) {
                        return $product->with([
                            'types' => function ($type) use ($SpecificID) {
                                return $type->where('id', $SpecificID);
                            }
                        ]);
                    }
                ]);
            }
        ])->get();

這篇關于laravel 中的急切加載關系，并帶有關系條件的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！