查询从两个表使用laravel查询生成器+ mysql

Question

我有两个表，一个叫做引号，另一个叫发票。我想检索所有没有发票的报价单。以下是我到目前为止的代码。我只能检索所有报价。我怎么能修改此查询

$quotations = Quotation::lists('id', 'id'); 

mysql> describe quotations; 
+---  ---- --------+------------------+------+-----+---------------------+-----------------------------+ 
| Field   | Type    | Null | Key | Default    | Extra      | 
+---------------+------------------+------+-----+---------------------+-----------------------------+ 
| id   | int(10) unsigned | NO | PRI | NULL    | auto_increment    | 
| customer_id | int(10) unsigned | NO | MUL | NULL    |        | 
| employee_id | int(10) unsigned | NO | MUL | NULL    |        | 
| exchange_rate | int(11)   | NO |  | 0     |        | 
| remark  | varchar(255)  | NO |  |      |        | 
| created_at | timestamp  | NO |  | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP | 
| updated_at | timestamp  | NO |  | 0000-00-00 00:00:00 |        | 
+---------------+------------------+------+-----+---------------------+-----------------------------+ 
mysql> describe invoices; 
+--------------+------------------+------+-----+---------------------+-----------------------------+ 
| Field  | Type    | Null | Key | Default    | Extra      | 
+--------------+------------------+------+-----+---------------------+-----------------------------+ 
| id   | int(10) unsigned | NO | PRI | NULL    | auto_increment    | 
| quotation_id | int(10) unsigned | NO | MUL | NULL    |        | 
| employee_id | int(10) unsigned | NO | MUL | NULL    |        | 
| amount  | int(11)   | NO |  | 0     |        | 
| balance  | int(11)   | NO |  | 0     |        | 
| created_at | timestamp  | NO |  | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP | 
| updated_at | timestamp  | NO |  | 0000-00-00 00:00:00 |        | 
+--------------+------------------+------+-----+---------------------+-----------------------------+ 

Answer 1

您可以使用以下方法：

Quotation::has('invoices', '<', 1)->get();

这上面的代码假设你有你的Quotation模型建立的关系，即：

class Quotation 
{ 
    public function invoices() 
    { 
     return $this->hasMany('\Models\Invoice'); 
    } 
} 

has方法将检查您已定义为第一个参数invoices的关系中的项目总数。第二个参数是小于的比较，第三个是你想比较的数量。因此，这将搜索发票数量小于1的所有报价。

您可以阅读更多about querying relations here根据查询关系存在。

Answer 2

我把它加入感谢下面的代码Emn1ty

$quotations = Quotation::has('taxInvoices', '<', 1)->get();