Question

我有一个数据透视表（builder_project），该表用于'项目'和' builders '表之间的多对多关系。至此一切正常。

但是，我希望用户能够在数据透视表（ builder_project ）中添加'注释'，因为应该可以添加许多注释，所以我创建了名为“ 注释”的表，该表与数据透视表具有一对多关系。

但是，我尝试为数据透视表创建模型；当我尝试在数据透视模型中访问该方法时，出现以下错误：

SQLSTATE [42S22]：找不到列：1054未知的列“注释”。在 'where子句'（SQL：从存在的builder_project中选择* （从notes中选择*，其中builder_project。project_projectID = notes。``））

这是我的数据透视模型的代码：

namespace Estimating;

use Illuminate\Database\Eloquent\Relations\Pivot;

class Builder_project extends Pivot
{


    protected $table = "builder_project";

    protected $primaryKey = 'project_projectID'; // I need to add the other primary key here but I undestand it's not possible on Laravel
    protected $fillable = [
        'project_projectID',
        'builder_builderID',
        'note',

    ];
    // One to many relationships
    /**
     * 
     */
    public function test()
    {
        return $this->hasMany('Estimating\Builder_project_note');
    }

}

这是Builder_project_note的模型：

<?php

namespace Estimating;

use Illuminate\Database\Eloquent\Model;

class Builder_project_note extends Model
{
    //Determines which database table to use, in this case 'projects' table
    protected $table = "notes";

    protected $primaryKey = 'noteID';
    protected $fillable = [
        'project_projectID',
        'builder_builderID',
        'note',

    ];

    // One to many relationships
    /**
     * Get the status that owns the project.
     */
    public function test()
    {
        return $this->belongsTo(
            'Estimating\Builder_project'); // I know that here I need an ID from Builder_project pivot table - but I have a composite key!;
    }


}

这就是我试图从控制器中获取数据并收到错误的方式：

public function editBuilderProject(Request $request, $builderID, $projectID)
    {
        $browserDetails = new Agent();
        $project = Project::find($projectID); 
        $builder = Builder::find($builderID);

        $builder_project_statuses = Builder_project_status::all();

        $builder_project_note = Builder_project::has('test')->get();

        dd($builder_project_note);



        return view('projects/edit-builder-project', compact('browserDetails', 'project','builder', 'builder_project_statuses', 'builder_project_note'));
        //return  $projectID."  ". $builderID;
    }

如果有人不够清楚，我可以感谢我向我指出正确的方向-这是我在这里的第一篇文章:)

我已经上传了我的数据库模型的样本： Database Model example

Answer 1

Laravel不喜欢基于多列的主键。您需要在数据透视表中添加自己的builder_project.id列，该列将成为便笺表使用的字段。

使用数据透视表的外键为Table创建雄辩的关系-Laravel

1 个答案: