Hello guys! I am running with two problem in my system.. I installed Laravel 5.4 and followed the Blog tutorial step by step. When I login and go to the link posts, I see all posted posts but if I press the edit button, I get the following error: 2/2 ErrorException in Builder.php line 2508: Call to undefined method Illuminate\Database\Query\Builder::getRelatedIds() (View: C:\wamp64\www\GOLITOnuevo\resources\views\posts\edit.blade.php)..

1/2 BadMethodCallException in Builder.php line 2508: Call to undefined method Illuminate\Database\Query\Builder::getRelatedIds()..

When I go the link blog in the main menu. If I press the button see more, I get the following errors: 2/2 ErrorException in a00eaacb888ecdb0fab13fde293184ce85a468a8.php line 1: Trying to get property of non-object (View: C:\wamp64\www\GOLITO1\resources\views\blog\single.blade.php) 1/2ErrorException in a00eaacb888ecdb0fab13fde293184ce85a468a8.php line 1: Trying to get property of non-object..

This is the code for the BlogController:..

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use App\Post;
use App\Tag;
use App\Category;
use Session;
use Purifier;
use Image;

class PostController extends Controller
{
    public function __construct() {
        $this->middleware('auth');
    }
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $posts = Post::orderBy('id', 'desc')->paginate(10);
        return view('posts.index')->withPosts($posts);
    }


    
    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        $categories = Category::all();
        $tags = Tag::all();
        return view('posts.create')->withCategories($categories)->withTags($tags);
    }
    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        // validate the data
        $this->validate($request, array(
                'title'         => 'required|max:255',
                'slug'          => 'required|alpha_dash|min:5|max:255|unique:posts,slug',
                'category_id'   => 'required|integer',
                'body'          => 'required'
                // 'featured_image' => 'sometimes|image'
            ));
        // store in the database
        $post = new Post;
        $post->title = $request->title;
        $post->slug = $request->slug;
        $post->category_id = $request->category_id;
        $post->body = Purifier::clean($request->body);

        if ($request->hasFile('featured_image')) {
            $image = $request->file('featured_image');
            $filename = time() .'.' .$image->getClientOriginalExtension();
            $location = public_path('images/' . $filename);
            Image::make($image)->resize(800, 400)->save($location);

            $post->image = $filename;
        }

        $post->save();

        $post->tags()->sync($request->tags, false);

        Session::flash('success', 'The blog post was successfully saved!');

        return redirect()->route('posts.show', $post->id);
    }
    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        $post = Post::find($id);
        return view('posts.show')->withPost($post);
    }
    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        // find the post in the database and save as a var
        $post = Post::find($id);
        $categories = Category::all();
        $categories = array();
        foreach ($categories as $category) {
            $categories[$category->id] = $category->name;
        }
        $tags = Tag::all();
        $tags2 = array();
        foreach ($tags as $tag) {
            $tags2[$tag->id] = $tag->name;
        }
        // return the view and pass in the var we previously created
        return view('posts.edit')->withPost($post)->withCategories($categories)->withTags($tags2);
    }
    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        // Validate the data
        $post = Post::find($id);

        if ($request->input('slug') == $post->slug) {
            $this->validate($request, array(
                'title' => 'required|max:255',
                'category_id' => 'required|integer',
                'body'  => 'required'
            ));
        } else {
        $this->validate($request, array(
                'title' => 'required|max:255',
                'slug'  => 'required|alpha_dash|min:5|max:255|unique:posts,slug',
                'category_id' => 'required|integer',
                'body'  => 'required'
            ));
        }
        // Save the data to the database
        $post = Post::find($id);
        $post->title = $request->input('title');
        $post->slug = $request->input('slug');
        $post->category_id = $request->input('category_id');
        $post->body = Purifier::clean($request->input('body'));
        $post->save();
        if (isset($request->tags)) {
            $post->tags()->sync($request->tags);
        } else {
            $post->tags()->sync(array());
        }

        // set flash data with success message
        Session::flash('success', 'This post was successfully saved.');
        // redirect with flash data to posts.show
        return redirect()->route('posts.show', $post->id);
    }
    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        $post = Post::find($id);
        $post->tags()->detach();
        $post->delete();
        Session::flash('success', 'The post was successfully deleted.');
        return redirect()->route('posts.index');
    }
}

I will attach the code for Blog/index.blade.php as well..

@extends('main')

@section('title', '| Blog')

@section('content')


	<div class="row">
		<div class="col-md-8 col-md-offset-2">
			<h1>Blog</h1>
		</div>
	</div>

	@foreach ($posts as $post)
	<div class="row">
		<div class="col-md-8 col-md-offset-2">
			<h2>{{ $post->title }}</h2>
			<h5>Published: {{ date('M j, Y', strtotime($post->created_at)) }}</h5>

			<p>{{ substr(strip_tags($post->body), 0, 250) }}{{ strlen(strip_tags($post->body)) > 250 ? '...' : "" }}</p>

			<a href="{{ route('blog.single', $post->id) }}" class="btn btn-success">Read More</a>
			<hr>
		</div>
	</div>
	@endforeach

	<div class="row">
		<div class="col-md-12">
			<div class="text-center">
				{!! $posts->links() !!}
			</div>
		</div>
	</div>


@endsection

This is the code in the single.blade.php

@extends('main')

<?php $titleTag = htmlspecialchars($post->title); ?>

@section('title', "| $titleTag")

@section('content')

	<div class="row">
		<div class="col-md-8 col-md-offset-2">
			<img src="{{ asset('images/' .$post->image) }}" height="400" width="800"/>
			<h1>{{ $post->title }}</h1>
			<p>{!! $post->body !!}</p>
			<hr>
			<p>Posted In: {{ $post->category->name }}</p>
		</div>
	</div>

	<div class="row">
		<div class="col-md-8 col-md-offset-2">
			<h3 class="comments-title"><span class="glyphicon glyphicon-comment"></span>  {{ $post->comments()->count() }} Comments</h3>
			@foreach($post->comments as $comment)
				<div class="comment">
					<div class="author-info">

						<img src="{{ "https://www.gravatar.com/avatar/" . md5(strtolower(trim($comment->email))) . "?s=50&d=monsterid" }}" class="author-image">
						<div class="author-name">
							<h4>{{ $comment->name }}</h4>
							<p class="author-time">{{ date('F nS, Y - g:iA' ,strtotime($comment->created_at)) }}</p>
						</div>

					</div>

					<div class="comment-content">
						{{ $comment->comment }}
					</div>

				</div>
			@endforeach
		</div>
	</div>

	<div class="row">
		<div id="comment-form" class="col-md-8 col-md-offset-2" style="margin-top: 50px;">
			{{ Form::open(['route' => ['comments.store', $post->id], 'method' => 'POST']) }}

				<div class="row">
					<div class="col-md-6">
						{{ Form::label('name', "Name:") }}
						{{ Form::text('name', null, ['class' => 'form-control']) }}
					</div>

					<div class="col-md-6">
						{{ Form::label('email', 'Email:') }}
						{{ Form::text('email', null, ['class' => 'form-control']) }}
					</div>

					<div class="col-md-12">
						{{ Form::label('comment', "Comment:") }}
						{{ Form::textarea('comment', null, ['class' => 'form-control', 'rows' => '5']) }}

						{{ Form::submit('Add Comment', ['class' => 'btn btn-success btn-block', 'style' => 'margin-top:15px;']) }}
					</div>
				</div>

			{{ Form::close() }}
		</div>
	</div>

@endsection

This is the code for Post/edit.blade.php..

@extends('main')

@section('title', '| Edit Blog Post')

@section('stylesheets')

   {!! Html::style('css/select2.min.css') !!}

   <script src="//cloud.tinymce.com/stable/tinymce.min.js"></script>

    <script>
        tinymce.init({
         selector:'textarea',
         plugins: 'link code'
         
         });
        
    </script>

@endsection

@section('content')

   <div class="row">
      {!! Form::model($post, ['route' => ['posts.update', $post->id], 'method' => 'PUT']) !!}
      <div class="col-md-8">
         {{ Form::label('title', 'Title:') }}
         {{ Form::text('title', null, ["class" => 'form-control input-lg']) }}

         {{ Form::label('slug', 'Slug:', ['class' => 'form-spacing-top']) }}
         {{ Form::text('slug', null, ['class' => 'form-control']) }}

         {{ Form::label('category_id', "Category:", ['class' => 'form-spacing-top']) }}
         {{ Form::select('category_id', $categories, null, ['class' => 'form-control']) }}

         {{ Form::label('tags', 'Tags:', ['class' => 'form-spacing-top']) }}
         {{ Form::select('tags[]', $tags, null, ['class' => 'form-control select2-multi', 'multiple' => 'multiple']) }}

         {{ Form::label('featured_image', 'Update Featured Image:') }}
         {{ Form::file('featured_image') }}
         
         {{ Form::label('body', "Body:", ['class' => 'form-spacing-top']) }}
         {{ Form::textarea('body', null, ['class' => 'form-control']) }}
      </div>

      <div class="col-md-4">
         <div class="well">
            <dl class="dl-horizontal">
               <dt>Created At:</dt>
               <dd>{{ date('M j, Y h:ia', strtotime($post->created_at)) }}</dd>
            </dl>

            <dl class="dl-horizontal">
               <dt>Last Updated:</dt>
               <dd>{{ date('M j, Y h:ia', strtotime($post->updated_at)) }}</dd>
            </dl>
            <hr>
            <div class="row">
               <div class="col-sm-6">
                  {!! Html::linkRoute('posts.show', 'Cancel', array($post->id), array('class' => 'btn btn-danger btn-block')) !!}
               </div>
               <div class="col-sm-6">
                  {{ Form::submit('Save Changes', ['class' => 'btn btn-success btn-block']) }}
               </div>
            </div>

         </div>
      </div>
      {!! Form::close() !!}
   </div>   <!-- end of .row (form) -->

@stop

@section('scripts')

   {!! Html::script('js/select2.min.js') !!}

   <script type="text/javascript">
      $('.select2-multi').select2();
      $('.select2-multi').select2().val({!! json_encode($post->tags()->getRelatedIds()) !!}).trigger('change');
   </script>

@endsection