php - laravel 如何从其他表中选择字段

Question

我想从另一个表中选择一个字段，我如何在 laravel 中做到这一点，我在 laravel 中还是新手。

这是我的代码

$company = Company::select(
['companies.id', 'companies.CompanyName', 'companies.Discount', 'companies.OrgNumber', 'companies.ExternalID', 'companies.DCity'])
 ->join('companystructures AS cs', 'cs.ChildCompanyID', '=', 'companies.id')
 ->where(['companies.Active' => 1, 'cs.Active' => 1])->get();

我想向表 companystructs 中的字段 ParentCompanyID 添加更多选择。

我尝试这样做，但出现错误

$company = Company::select(['companies.id', 'companies.CompanyName', 'companies.Discount', 'companies.OrgNumber','companies.ExternalID', 'companies.DCity', '**companystructures.ParentCompanyID**'])
 ->join('companystructures AS cs', 'cs.ChildCompanyID', '=', 'companies.id')
 ->where(['companies.Active' => 1, 'cs.Active' => 1])->get();

Answer 1

删除 ** 并在 select 中使用 cs.ParentCompanyID 而不是 companystructs.ParentCompanyID

$company = Company::select([
                 'companies.id', 
                 'companies.CompanyName', 
                 'companies.Discount', 
                 'companies.OrgNumber',
                 'companies.ExternalID', 
                 'companies.DCity', 
                 'cs.ParentCompanyID'
             ])
          ->join('companystructures AS cs', 'cs.ChildCompanyID', '=', 'companies.id')
          ->where(['companies.Active' => 1, 'cs.Active' => 1])
          ->get();