我正在使用laravel 5.5来更新条目。问题出在将主键"id"(默认 pk 更改为"project_id")之后。添加项目工作正常,但更新项目无法正常工作。这是我得到的错误。
方法保存不存在。
这是我的模型。
<?php
namespace App;
use IlluminateDatabaseEloquentModel;
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;
$project->save();
return redirect('/listProjects');
}
}
使用 get()
返回一个集合。尽管您正在传递一个"唯一"ID,即project_id
,但它仍然会返回一个集合 - 该集合中只有一个元素。
随后,您的代码将无法像您经历的那样工作,或者至少不会不进行一些更改以使$project
引用集合中的第一个元素。
不过这是一个快速解决方案,只需更改此设置:
$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 将返回与查询匹配的第一个元素,并实际返回该元素(而不是具有一个元素的集合),因此您可以直接编辑和保存它。
找到的解决方案。
$project_id = $request->input('project_id');
$project = Project::find($project_id);
$project->save();
你可以用 id 找到它
Project::find($id);
或者像詹姆斯说的那样得到第一个元素:
$project = Project::where("project_id", $request->input('project_id'))->first();