Laravel：在插入之前检查记录是否存在

Question

我有两个表：assignments 表（列assignment_id、Staff Name、asset_id、department、date、status）和一个assets 表（列asset_id、tag_name、serial_number、model_number、color）。 asset 表列与 assignments 表相关联。我想在 assignments 表中执行插入，但在插入之前，我想检查 assignments 表中是否已经存在 asset_id 以及是否为 status = 'Active' 那么插入应该抛出错误/不应该发生。

AssignmentsController

class AssignmentController extends Controller
{

public function assignment(){
    $assignments = Assignment::all();
    return view('assignment/index', ['assignments' => $assignments]);
}   

  public function add(Request $request){

    $this->validate($request, [
        'assignment_id' => '',
        'staff_name' => 'required',
        'asset_id' => 'required',
        'department' => 'required',
        'date' => 'required',
        'status' => 'required'
    ]);
    $assignments =  new Assignment;
    $assignments  ->assignment_id = $request->input('assignment_id');
    $assignments  ->staff_id  = $request->input('staff_id');
    $assignments  ->asset_id = $request->input('asset_id');
    $assignments  ->department_id = $request->input('department_id');
    $assignments  ->date  = $request->input('date');
    $assignments  ->status = $request->input('status');

$count = Assignment::where('status', '=' ,'Active' )->
    where('asset_id', '=' ,$assignments->asset_id)->
    count();
    if($count) {
        abort(405, 'Trying to assign an already assigned asset');
    }

    $assignments  ->save();
    return redirect('/assignment/index') ->with('info', 'New Assignment Saved Successfully!');
}

Assginment.php

class Assignment extends Model
{
    protected $primaryKey = 'assignment_id';    

    public function asset()
    {
        return $this->belongsTo('App\Asset', 'asset_id');
    }
}

AssignmentsController 中的以下变量和 if 语句总是抛出 if statement 中的错误，无论它是否为真并且插入不会发生但是当整个语句被清除时，插入发生。

$count = Assignment::where('status', '=' ,'Active' )->
        where('asset_id', '=' ,$assignments->asset_id)->
        count();
        if($count) {
            abort(405, 'Trying to assign an already assigned asset');
        } 

所以我想要一种方法来检查要插入的记录是否已经存在，条件是 asset_id 存在，然后检查它是否是 status ='Active' 然后抛出一个错误，但如果不是，则插入发生。如果您理解它，请帮助。提前致谢。

Answer 1

你可以这样做：

public function add(Request $request){
    $this->validate($request, [
        'assignment_id' => '',
        'staff_name' => 'required',
        'asset_id' => 'required',
        'department' => 'required',
        'date' => 'required',
        'status' => 'required'
    ]);
    $assignment = Assignment::firstOrNew([ 
           "status" => "Active", 
           "asset_id" => $assignments->asset_id
    ], $request->all()); 
    abort_if($assignment->exists(), 405, 'Trying to assign an already assigned asset'); 
    $assignment->save();
    return redirect('/assignment/index')
          ->with('info', 'New Assignment Saved Successfully!');
}

Answer 2

解决方案

  $count = Assignment::where('asset_id', '=' ,$assignments->asset_id)->
        where('status', '=' ,'Active')->
        count();
        if($count == 1 && $assignments->status != 'Disable') {
            abort(405, 'Trying to assign an already assigned asset');
        }

我的代码中的错误：我正在计算所有分配，如果有任何活动状态，我得到一个错误....我需要准确检查我想要分配的分配是活动还是禁用然后分配应该发生或不属于它的状态（活动/禁用）。谢谢你们特别是apokryfos。