试图获取非对象的属性“ id” 如何修复该错误，请向我解释某人
edit.blade.php
@extends（'layouts.app'）
@section（'content'）
<div class="card">
<div class="card-header text-center">Edit Post : {{$posts->title}}</div>
<div class="card-body">
@if(count($errors)>0)
<ul class="list-group alert">
@foreach($errors->all() as $error)
<li class="list-group-item text-danger">
{{$error}}
</li>
@endforeach
</ul>
@endif
<form action="{{route('post.update',['id'=>$posts->id])}}" method="post" enctype="multipart/form-data">
{{csrf_field()}}
<div class="form-group">
<label for="title">Post Title</label>
<input type="text" name="title" placeholder="Enter" class="form-control" value="{{$posts->title}} ">
</div>
<div class="form-group">
<label for="image">Featured Image</label>
<input type="file" name="image" class="form-control">
</div>
<div class="form-group">
<label for="category">Select a Category</label>
<select name="category_id" id="category" class="form-control">
@foreach($categories as $cat)
<option value="{{$cat->id}}"
@if($posts->cat->id== $cat->id)
selected
@endif
>{{$cat->name}}</option>
@endforeach
</select>
</div>
<div class="form-group">
<label for="tag">Select Tags</label>
@foreach($tag as $tags)
<div class="checkbox">
<label><input type="checkbox" name="tags[]" value="{{$tags->id}}"
@foreach($posts->tags as $t)
@if($tags->id==$t->id)
checked
@endif
@endforeach
>{{$tags->tag}}</label>
</div>
@endforeach
</div>
<div class="form-group">
<label for="content">Description</label>
<textarea name="content" id="content" cols="5" rows="5" class="form-control"> {{$posts->content}}</textarea>
</div>
<div class="form-group">
<input type="submit" name="submit" value="Submit" class="btn btn-primary">
</div>
</form>
</div>
</div>
@endsection PostController.php @extends（'layouts.app'）
@section（'content'）
<div class="card">
<div class="card-header text-center">Edit Post : {{$posts->title}}</div>
<div class="card-body">
@if(count($errors)>0)
<ul class="list-group alert">
@foreach($errors->all() as $error)
<li class="list-group-item text-danger">
{{$error}}
</li>
@endforeach
</ul>
@endif
<form action="{{route('post.update',['id'=>$posts->id])}}" method="post" enctype="multipart/form-data">
{{csrf_field()}}
<div class="form-group">
<label for="title">Post Title</label>
<input type="text" name="title" placeholder="Enter" class="form-control" value="{{$posts->title}} ">
</div>
<div class="form-group">
<label for="image">Featured Image</label>
<input type="file" name="image" class="form-control">
</div>
<div class="form-group">
<label for="category">Select a Category</label>
<select name="category_id" id="category" class="form-control">
@foreach($categories as $cat)
<option value="{{$cat->id}}"
@if($posts->cat->id== $cat->id)
selected
@endif
>{{$cat->name}}</option>
@endforeach
</select>
</div>
<div class="form-group">
<label for="tag">Select Tags</label>
@foreach($tag as $tags)
<div class="checkbox">
<label><input type="checkbox" name="tags[]" value="{{$tags->id}}"
@foreach($posts->tags as $t)
@if($tags->id==$t->id)
checked
@endif
@endforeach
>{{$tags->tag}}</label>
</div>
@endforeach
</div>
<div class="form-group">
<label for="content">Description</label>
<textarea name="content" id="content" cols="5" rows="5" class="form-control"> {{$posts->content}}</textarea>
</div>
<div class="form-group">
<input type="submit" name="submit" value="Submit" class="btn btn-primary">
</div>
</form>
</div>
</div>
@endsection 当我选择未选择的类别并显示id为非对象时，尝试获取非对象的属性“ id”
PostController.php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Category;
use App\Post;
use App\Tag;
use Session;
class PostController extends Controller
{
/**
* Display a listing of the resource.
*
* @return \Illuminate\Http\Response
*/
public function index()
{
return view('admin.posts.index')->with('posts',Post::all());
}
/**
* Show the form for creating a new resource.
*
* @return \Illuminate\Http\Response
*/
public function create()
{
$categories=Category::all();
if($categories->count()==0){
Session::flash('info','You must have some categories before attempt post.');
return redirect()->back();
}
return view('admin.posts.create')->with('category',$categories)->with('tags',Tag::all());
}
/**
* Store a newly created resource in storage.
*
* @param \Illuminate\Http\Request $request
* @return \Illuminate\Http\Response
*/
public function store(Request $request)
{
$this->validate($request,[
'title'=>'required|max:255',
'image'=>'required|image',
'content'=>'required',
'category_id'=>'required',
'tags'=>'required'
]);
$images=$request->image;
$image_new_name=time().$images->getClientOriginalName();
$images->move('uploads/posts',$image_new_name);
$post=Post::create([
'title'=>$request->title,
'image'=>$request->image,
'content'=>$request->content,
'image'=>'uploads/posts/'.$image_new_name,
'category_id'=>$request->category_id,
'slug'=>str_slug($request->title)
]);
$post->tags()->attach($request->tags);
Session::flash('success','Post Created Successfully');
return redirect()->back();
}
/**
* Display the specified resource.
*
* @param int $id
* @return \Illuminate\Http\Response
*/
public function show($id)
{
//
}
/**
* Show the form for editing the specified resource.
*
* @param int $id
* @return \Illuminate\Http\Response
*/
public function edit($id)
{
$post=Post::find($id);
return view('admin.posts.edit')->with('posts',$post)
->with('categories',Category::all())
->with('tag',Tag::all());
}
/**
* Update the specified resource in storage.
*
* @param \Illuminate\Http\Request $request
* @param int $id
* @return \Illuminate\Http\Response
*/
public function update(Request $request, $id)
{
$this->validate($request,[
'title'=>'required',
'content'=>'required',
'category_id'=>'required',
]);
$post=Post::find($id);
if ($request->hasFile('image'))
{
$featured=$request->image;
$featured_new_name=time().$featured->getClientOriginalName();
$featured->move('uploads/posts',$featured_new_name);
$post->image='uploads/posts/'.$featured_new_name;
}
$post->title=$request->title;
$post->content=$request->content;
$post->category_id=$request->category_id;
$post->save();
$post->tags()->sync($request->tags);
Session::flash('success','Your Post Updated Successfully');
return redirect()->back();
}
/**
* Remove the specified resource from storage.
*
* @param int $id
* @return \Illuminate\Http\Response
*/
public function destroy($id)
{
$post=Post::find($id);
$post->delete();
Session::flash('success','Post was just trashed');
return redirect()->back();
}
public function trashed(){
$post=Post::onlyTrashed()->get();
return view('admin.posts.trashed')->with('posts',$post);
}
public function kill($id){
$post=Post::withTrashed()->where('id',$id)->first();
$post->forceDelete();
Session::flash('success','Post deleted permanently');
return redirect()->back();
}
public function restore($id){
$post=Post::withTrashed()->where('id',$id)->first();
$post->restore();
Session::flash('success','Post Restore ');
return redirect()->route('posts');
}
}
答案 0 :(得分：0)
请确保categories，tags不为空，并且Post的关系也为真。