我正在使用laravel 5.5来更新条目。问题是在更改主键'id'之后,这是一个默认的默认pk为'project_id'。添加项目工作正常,但更新项目不能正常工作。这是我得到的错误。
方法保存不存在。
这是我的模特。
<?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 $this->hasMany(Task::class);
}
}
这是我的控制器功能。
public function editProject($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;
$project->save();
return redirect('/listProjects');
}
}
答案 0 :(得分:21)
使用get()
会返回collection。尽管您传递了一个“唯一”ID project_id
,它仍将返回一个集合 - 该集合中只有一个元素。
随后,您的代码将无法按照您的经验运行,或者至少在没有一些更改的情况下使$project
引用集合中的第一个元素。
这是一个快速解决方案,只需改变这个:
$project = Project::where("project_id", $request->input('project_id'))->get();
到此:
$project = Project::where("project_id", $request->input('project_id'))->first();
通过使用first()
,eloquent将返回与查询匹配的第一个元素并实际返回元素(而不是具有一个元素的集合),因此您可以直接编辑并保存它。
答案 1 :(得分:1)
这是我找到的解决方案。
$project_id = $request->input('project_id');
$project = Project::find($project_id);
$project->save();
答案 2 :(得分:1)
您可以使用ID通过ID查找它
Project::find($id);
或者像詹姆斯所说的那样获得第一个元素:
$project = Project::where("project_id", $request->input('project_id'))->first();