Laravel 5.5 使用修改后的主键更新条目时不存在方法保存

Question

我正在与 laravel 5.5 合作更新条目。问题是在更改主键 'id' 之后，这是 elequoent 默认 pk 到 'project_id'。添加项目工作正常，但更新项目工作不正常。这是我收到的错误。

Method save does not exist.

这是我的模型。

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Project extends Model
{
   protected $primaryKey = 'project_id';
    public function user()
    {
        return $this->belongsTo(User::class);
    }
    public function tasks()
    {
        return $this->hasMany(Task::class);
    }
}

这是我的控制器函数。

public function editProject($id){

        $project = Project::where('project_id', $id)->firstOrFail();
        $data = ["project_info" => $project];
        return view('projects.edit')->with($data);
    }
    public function updateProject(Request $request){
        $data = $request->all();
        $validator = Validator::make($data, [
            'project_title' => 'required',
            'project_description' => 'required',
            'project_start_date' => 'required',
            'project_end_date' => 'required',
            'project_status' => 'required',
        ]);

        $response = [];

        if ($validator->fails()){
            $response["errors"] = [$validator->messages()->first()];
            $response["success"] = false;
            return json_encode($response);
        }

        else{
            $project = Project::where("project_id", $request->input('project_id'))->get();
            $project->project_title = $request->project_title;
            $project->user_id = Session::get('user_id');
            $project->project_description = $request->project_description;
            $project->project_start_date = $request->project_start_date;
            $project->project_end_date = $request->project_end_date;
            $project->project_status = $request->project_status;
            $project->save();
            return redirect('/listProjects');
        }
    }

Answer 1

使用 get() return 一个 collection。尽管您传递的是 'unique' ID，project_id，它仍将是 return 一个集合 - 该集合将只包含一个元素。

随后，您的代码将不会像您所经历的那样工作，或者至少不会在没有一些更改的情况下使 $project 引用集合中的第一个元素。

虽然这是一个快速修复，只需更改此：

$project = Project::where("project_id", $request->input('project_id'))->get();

对此：

$project = Project::where("project_id", $request->input('project_id'))->first();

通过使用 first()，eloquent 将 return 匹配查询的第一个元素，实际上 return 元素（与只有一个元素的集合相反）这样您就可以直接编辑并保存了。

Answer 2

这是我找到的解决方案。

$project_id = $request->input('project_id');
$project = Project::find($project_id);
$project->save();

Answer 3

您可以使用

通过 id 找到它

Project::find($id);

或者像James说的获取第一个元素：

$project = Project::where("project_id", $request->input('project_id'))->first();

Laravel 5.5 使用修改后的主键更新条目时不存在方法保存

Laravel 5.5 Method save does not exist when updating entries with modified primary key

php

laravel-5

laravel-5.5