laravel 中的急切加载关系，并带有关系条件

Eager load relationships in laravel with conditions on the relation(laravel 中的急切加载关系，并带有关系条件)

问题描述

我在树中有相互关联的类别.每个类别 hasMany 子项.每个终端类别有许多个产品.

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

产品也belongsToMany 不同的类型.

我想急切地加载带有他们的孩子和产品的类别，但我也想设置一个条件，即产品属于某种类型.

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.

这就是我的类别模型的样子

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');
}

产品型号

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

在我的数据库中，我有四个表:类别、产品、类型和产品类型

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

我尝试过像这样快速加载，但它加载了所有产品，而不仅仅是满足条件的产品:

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();

推荐答案

代替当前查询，尝试这是否符合您的需要.(我根据您的评论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();

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