php - Laravel 试图获取非对象的属性 'project_name'

Question

我是 Laravel 的新手，只是想指出一些问题。我在读取我的展示页面时遇到问题，当我打开展示页面 (show.blade.php) 时它返回此错误

Trying to get property 'project_name' of non-object (View: C:\Server\data\htdocs\ProjectCMS\resources\views\project\show.blade.php).

我不知道我做错了什么，因为我让它工作了，当我再次打开显示页面时它返回了错误。

如有任何帮助，我们将不胜感激!

ProjectController.php:

public function show($id)
{
    $user_id = auth()->user()->id;
    $project = Project::where('user_id', $user_id)->first();
    $projectitem = Projectitem::where('project_id', $id)->first();

    return view('project.show', [
        'project'     => $project,
        'projectitem' => $projectitem,
    ]);
}

web.php 路由

Route::get('/projects/{id}', 'ProjectController@show');

show.blade.php:

@extends('layouts.app')

@section('content')

    <div class="container">

        <div class="well">

            <div class="card mt-5 mb-5">
                <h2 class="card-header">{{$projectitem->project_name}}</h2>
                <div class="card-body">


                    <h2 class="card-text mt-4 mb-2"><b>Beschrijving:</b></h2><br>
                    {!!$projectitem->description!!}

                    <h2 class="mt-4 mb-2"><b>Tijdsduur(in uren):</b>&nbsp;{{$projectitem->time_span}} Uren</h2><br>

                    <h2 class="mt-2 mb-2"><b>Opdrachtgever:</b> &nbsp;{{$projectitem->client}}</h2>

                    <h2 class="mt-4 mb-2"><b>Text verslag:</b></h2><br>
                    {!!$projectitem->text_report!!}

                    <h2 class="mt-4 mb-2"><b>Foto's vooraf: &nbsp;</b></h2><br>
                    {!!$projectitem->images_before!!}
                    <h2 class="mt-4 mb-2"><b>Foto's achteraf: &nbsp;</b></h2><br>
                    {!!$projectitem->images_after!!}

                    <div class="row">
                        <div class="col-md-6">
                            <h2 class="mt-4"><b>Beschikbaar op: &nbsp;</b></h2>
                            <h4>Facebook:&nbsp;<?php if($projectitem->facebook == 1){echo "wel";}else{echo "niet";}?></h4>
                            <h4>Instagram:&nbsp;<?php if($projectitem->instagram == 1){echo "wel";}else{echo "niet";}?></h4>
                            <h4>Linkedin:&nbsp;<?php if($projectitem->linkedin == 1){echo "wel";}else{echo "niet";}?></h4>
                            <h4>Website:&nbsp;<?php if($projectitem->website == 1){echo "wel";}else{echo "niet";}?></h4>
                        </div>
                    </div>

                    <h4 class="mt-4 mb-2"><b>Aangemaakt door:</b>&nbsp;{{$projectitem->created_by}}</h4><br>
                    <div class="row">
                        <div class="col-md-6">
                            <h4 class="mt-4 mb-2 floatl "><b>Aangemaakt op:</b>&nbsp;{{$projectitem->created_at}}</h4><br>
                        </div>
                        <div class="col-md-6">
                            <h4 class="mt-4 mb-2 ml-1 mr-1 floatr "><b>Laatst gewijzigd op:</b>&nbsp;{{$projectitem->updated_at}}</h4><br>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>


@endsection

Projectitem.php(模型)

namespace App;

use Illuminate\Database\Eloquent\Model;

class Projectitem extends Model
{
    protected $table = "project_item";

    function project(){

        return $this->belongsTo('App\Project');

    }
}

Project.php(模型)

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Project extends Model
{
    protected $table = "project";



public function projectitem()
    {
        return $this->hasMany('App\Projectitem');
    }

}

迁移projectitem表

 public function up()
{
    Schema::create('project_item', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('project_name');
        $table->string('client');
        $table->text('description');
        $table->float('time_span');
        $table->text('text_report');
        $table->text('images_before');
        $table->text('images_after');
        $table->boolean('facebook');
        $table->boolean('instagram');
        $table->boolean('linkedin');
        $table->boolean('website');
        $table->integer('belongs_to');
        $table->string('created_by');
        $table->timestamps();
    });
}

Answer 1

检查您的数据库中是否有 Projectitem 模型的记录。

听起来它正在返回 null，这意味着没有找到您指定的 where 条件的结果。