Laravel 5：如何使用Eloquent对数据透视表进行连接查询？

Question

I have 2 tables in my Laravel application namely customers and stores . Customers can belong to many stores and stores can have many customers. There's a pivot table between them to store that relation.

Question is, how do I extract the list of customers for a given store using Eloquent? Is it possible? I am currently able to extract that using Laravel's Query Builder . Here is my code:

| customers | stores      | customer_store |
-------------------------------------------
| id        | id          | customer_id    |
| name      | name        | store_id       |
| created_at| created_at  | created_at     |
| updated_at| updated_at  | updated_at     |

Customer Model:

public function stores(){
        return $this->belongsToMany(Store::class)
            ->withPivot('customer_store', 'store_id')
            ->withTimestamps();
    }

Store Model:

public function customers(){
        return $this->belongsToMany(Customer::class)
            ->withPivot('customer_store', 'customer_id')
            ->withTimestamps();
    }

DB Query (using Query Builder):

$customer = DB::select(SELECT customers.id, customers.name, customers.phone, customers.email, customers.location FROM customers LEFT JOIN customer_store on customers.id = customer_store.customer_id WHERE customer_store.store_id = $storeID);

Answer 1

Try this one:

public function result(Request $request) {

    $storeId = $request->get('storeId');

    $customers = Customer::whereHas('stores', function($query) use($storeId) {
        $query->where('stores.id', $storeId);
    })->get();

}

Answer 2

Try executing this...

$result = Customer::with('stores')->get();

Hope this helps.

To know more about Eloquent Relationship refer: https://laravel.com/docs/5.1/eloquent-relationships

Answer 3

Try below:

Here Customers is your model and $storeID is your store id. $storeID is outside of the scope of your callback. So you must use the use statement to pass them.

Customers::leftJoin('customer_store', function($join) use($storeID){
  $join->on('customers.id', '=', 'customer_store.customer_id')
  ->where('customer_store.store_id','=', $storeID);
})
->whereNotNull('customer_store.store_id')//Not Null Filter
->get();

Hope this help you!