Laravel5.1 搭建博客 --文章的增删改查

继文件上传后呢，咱来搞一搞文章的事情。

1 更改数据表

我们需要改改数据表的结构因为涉及到重命名列名所以咱需要引入一个包：Doctrine：

composer require "doctrine/dbal"

1.1 新建迁移文件

php artisan make:migration restructure_posts_table --table=posts

1.2 编辑迁移文件

class RestructurePostsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('posts', function (Blueprint $table) {
            // 在title字段后添加subtitle 文章的副标题
            $table->string('subtitle')->after('title');
            // 把content改为content_raw Markdown格式的文本
            $table->renameColumn('content', 'content_raw');
            // 在content字段后添加content_html 使用 Markdown 编辑内容但同时保存 HTML 版本
            $table->text('content_html')->after('content');
            // 在content_html字段后添加page_image 文章使用到缩略图
            $table->string('page_image')->after('content_html');
            // 在page_image字段后添加meta_description 文章说明
            $table->string('meta_description')->after('page_image');
            // 在meta_description字段后添加is_draft 是否是草稿
            $table->boolean('is_draft')->after('meta_description');
            // 在is_draft字段后添加layout 并设置默认值 使用的布局
            $table->string('layout')->after('is_draft')->default('blog.layouts.post');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('posts', function (Blueprint $table) {
            $table->dropColumn('subtitle');
            $table->dropColumn('content_html');
            $table->dropColumn('page_image');
            $table->dropColumn('meta_description');
            $table->dropColumn('is_draft');
            $table->dropColumn('layout');
            $table->renameColumn('content_raw', 'content');
        });
    }
}

1.3 运行迁移

运行命令后看眼数据库是否已经修改成功：

php artisan migrate

2 和Tag关联

文章和标签是多对多的关系，所以先创建迁移文件，然后记得运行迁移：

class CreatePostTagPivot extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('post_tag_pivot', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('tag_id')->unsigned()->index();
            $table->integer('post_id')->unsigned()->index();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('post_tag_pivot');
    }
}

2.1 编辑Tag模型

class Tag extends Model
{
    protected $fillable = ['tag', 'title', 'subtitle', 'page_image', 'meta_description', 'layout', 'reverse_direction'];

    // 定义关系
    public function posts()
    {
        return $this->belongsToMany(Post::class, 'post_tag_pivot');
    }

    /**
     * 批量创建需要的tag
     *
     * @param array $tags
     */
    public static function addNeededTags(array $tags)
    {
        if (count($tags) === 0){
            return;
        }

        // 通过tag字段在$tags数组中查找,把找到的模型通过lists来获取所有的tag字段
        $found = static::WhereIn('tag', $tags)->lists('tag')->all();

        foreach (array_diff($tags, $found) as $tag) {
            // 把不存在的tag进行创建 其他字段先自动填充
            static::create([
                'tag' => $tag,
                'title' => $tag,
                'subtitle' => 'Subtitle for '.$tag,
                'page_image' => '',
                'meta_description' => '',
                'reverse_direction' => false,
            ]);
        }
    }
}

3 展示文章

我们一步步的来，首先先来展示我们的文章吧。

3.1 修改PostController的index方法

    public function index()
    {
        return view('admin.post.index')->withPosts(Post::all());
    }

3.2 修改post/index.blade.php

@extends('admin.layout')

@section('content')
    <div class="container-fluid">
        <div class="row page-title-row">
            <div class="col-md-6">
                <h3>Post <small> >> Listing</small></h3>
            </div>
            <div class="col-md-6 text-right">
                <a href="/admin/post/create" class="btn btn-success btn-md">
                    <i class="fa fa-plus-circle"></i>  New Post
                </a>
            </div>
        </div>

        <div class="row">
            <div class="col-sm-12">
                @include('admin.partials.error')
                @include('admin.partials.success')

                <table id="posts-table" class="table table-bordered table-striped">
                    <thead>
                    <tr>
                        <td>Published</td>
                        <td>Title</td>
                        <td>Subtitle</td>
                        <td data-sortable="false">Published</td>
                    </tr>
                    </thead>
                    <tbody>
                    @foreach($posts as $post)
                        <tr>
                            <td data-order="{{ $post->published_at->timestamp }}">
                                {{ $post->published_at->format('j-M-y g:ia') }}
                            </td>
                            <td>{{ $post->title }}</td>
                            <td>{{ $post->subtitle }}</td>
                            <td>
                                <a href="/admin/post/{{ $post->id }}/edit" class="btn btn-xs btn-info">
                                    <i class="fa fa-edit"></i> Edit
                                </a>
                                <a href="/blog/{{ $post->slug }}" class="btn btn-xs btn-warning">
                                    <i class="fa fa-eye"></i> View
                                </a>
                            </td>
                        </tr>
                    @endforeach
                    </tbody>
                </table>
            </div>
        </div>
    </div>
@endsection

@section('scripts')
    <script>
        $(function () {
            $("#posts-table").DataTable({
                order: [[0, "desc"]]
            });
        });
    </script>
@endsection

4 创建文章

4.1 编辑create方法

    public function create()
    {
        $data = $this->dispatch(new PostFormFields());
        return view('admin.post.create', $data);
    }

在上面的代码中我们使用到了一个任务，这个任务就是返回每个字段的默认值

4.2 创建Job

创建create方法中用到的job：

php artisan make:job PostFormFields

在app/Jobs中找到刚刚创建的job编辑如下：

class PostFormFields extends Job implements SelfHandling
{
    protected $id;

    protected $fieldList = [
        'title' => '',
        'subtitle' => '',
        'page_image' => '',
        'content' => '',
        'meta_description' => '',
        'is_draft' => "0",
        'publish_date' => '',
        'publish_time' => '',
        'layout' => 'blog.layouts.post',
        'tags' => [],
    ];

    /**
     * Create a new job instance.
     *
     * @return void
     */
    public function __construct($id = null)
    {
        $this->id = $id;
    }

    /**
     * Execute the job.
     *
     * @return void
     */
    public function handle()
    {
        $fields = $this->fieldList;
        if ($this->id){
            $fields = $this->fieldsFromModel($this->id, $fields);
        } else {
            $when = Carbon::now()->addHour();
            $fields['publish_date'] = $when->format('M-j-Y');
            $fields['publish_time'] = $when->format('g:i A');
        }
        foreach ($fields as $fieldName => $fieldValue) {
            $fields[$fieldName] = old($fieldName, $fieldValue);
        }
        return array_merge($fields, ['allTags' => Tag::lists('tag')->all()]);
    }

    /**
     * 取出模型中的数据
     *
     * @param $id
     * @param array $fields
     * @return array
     */
    protected function fieldsFromModel($id, array $fields)
    {
        $post = Post::findOrFail($id);
        $fieldNames = array_keys(array_except($fields, ['tags']));
        $fields = ['id' => id];
        foreach ($fieldNames as $field) {
            $fields[$field] = $post->$field;
        }
        $fields['tags'] = $post->tags()->lists('tag')->all();

        return $fields;
    }
}

4.3 添加方法到Post模型

在job中我们使用了publishe_date和time，我们来实现这些get：

    /**
     * 设置ContentRaw的同时设置ContentHTML。
     * 
     * @param $value
     */
    public function setContentRawAttribute($value)
    {
        $this->attributes['content_raw'] = $value;
        $this->attributes['content_html'] = Markdown::convertToHtml($value);
    }


    /**
     * 使用content快捷的返回content_raw
     * 
     * @param $value
     * @return mixed
     */
    public function getContentAttribute($value)
    {
        return $this->content_raw;
    }

    /**
     * 快捷返回publish_time
     * 
     * @param $value
     * @return mixed
     */
    public function getPublishTimeAttribute($value)
    {
        return $this->published_at->format('g:i A');
    }

    /**
     * 快捷返回publish_date
     * 
     * @param $value
     * @return mixed
     */
    public function getPublishDateAttribute($value)
    {
        return $this->published_at->format('M-j-Y');
    }

4.4 下载需要用到的两个前端资源

我们在create视图中需要用到两个前端资源：Selectize.js(下拉列表功能)和Pickadate.js(日期插件)，我们来使用Bower下载：

bower install selectize --save
bower install pickadate --save

使用Gulp来整理前端资源：

var gulp = require('gulp');
var rename = require('gulp-rename');
var elixir = require('laravel-elixir');

/*
 |--------------------------------------------------------------------------
 | Elixir Asset Management
 |--------------------------------------------------------------------------
 |
 | Elixir provides a clean, fluent API for defining some basic Gulp tasks
 | for your Laravel application. By default, we are compiling the Less
 | file for our application, as well as publishing vendor resources.
 |
 */

/**
 * 拷贝操作
 */
gulp.task("copyfiles", function(){
    // js
    gulp.src("vendor/bower_dl/jquery/dist/jquery.js")
        .pipe(gulp.dest("resources/assets/js/"));
    // bootstrap
    gulp.src("vendor/bower_dl/bootstrap/less/**")
        .pipe(gulp.dest("resources/assets/less/bootstrap"));
    gulp.src("vendor/bower_dl/bootstrap/dist/js/bootstrap.js")
        .pipe(gulp.dest("resources/assets/js/"));
    // font 不用编译和合并 直接复制到public就可以
    gulp.src("vendor/bower_dl/bootstrap/fonts/**")
        .pipe(gulp.dest("public/assets/fonts"));

    // awesome
    gulp.src("vendor/bower_dl/font-awesome/less/**")
        .pipe(gulp.dest("resources/assets/less/fontawesome"));

    gulp.src("vendor/bower_dl/font-awesome/fonts/**")
        .pipe(gulp.dest("public/assets/fonts"));

    // 拷贝 datatables
    var dtDir = 'vendor/bower_dl/datatables.net-plugins/integration/';

    gulp.src("vendor/bower_dl/datatables/media/js/jquery.dataTables.js")
        .pipe(gulp.dest('resources/assets/js/'));

    gulp.src(dtDir + 'bootstrap/3/dataTables.bootstrap.css')
        .pipe(rename('dataTables.bootstrap.less'))
        .pipe(gulp.dest('resources/assets/less/others/'));

    gulp.src(dtDir + 'bootstrap/3/dataTables.bootstrap.js')
        .pipe(gulp.dest('resources/assets/js/'));

    // 拷贝selectize
    gulp.src("vendor/bower_dl/selectize/dist/css/**")
        .pipe(gulp.dest("public/assets/selectize/css"));
    gulp.src("vendor/bower_dl/selectize/dist/js/standalone/selectize.min.js")
        .pipe(gulp.dest("public/assets/selectize/"));

    // 拷贝 pickadate
    gulp.src("vendor/bower_dl/pickadate/lib/compressed/themes/**")
        .pipe(gulp.dest("public/assets/pickadate/themes/"));

    gulp.src("vendor/bower_dl/pickadate/lib/compressed/picker.js")
        .pipe(gulp.dest("public/assets/pickadate/"));

    gulp.src("vendor/bower_dl/pickadate/lib/compressed/picker.date.js")
        .pipe(gulp.dest("public/assets/pickadate/"));

    gulp.src("vendor/bower_dl/pickadate/lib/compressed/picker.time.js")
        .pipe(gulp.dest("public/assets/pickadate/"));
});

elixir(function(mix) {

    // 合并脚本文件
    mix.scripts([
            'js/jquery.js',
            'js/bootstrap.js',
            'js/jquery.dataTables.js',
            'js/dataTables.bootstrap.js'
        ],
        'public/assets/js/admin.js',
        'resources/assets'
    );

    // 编译 Less
    mix.less('admin.less', 'public/assets/css/admin.css');
});

运行Gulp：

gulp copyfiles
gulp

4.5 创建create视图

@extends("admin.layout")
{{-- 样式表 --}}
@section('styles')
    <link rel="stylesheet" href="/assets/selectize/css/selectize.css">
    <link rel="stylesheet" href="/assets/selectize/css/selectize.bootstrap3.css">
    <link rel="stylesheet" href="/assets/pickadate/themes/default.css">
    <link rel="stylesheet" href="/assets/pickadate/themes/default.date.css">
    <link rel="stylesheet" href="/assets/pickadate/themes/default.time.css">
@endsection
{{--content--}}
@section("content")
    <div class="container-fluid">
        <div class="row page-title-row">
            <div class="col-md-12">
                <h3>Posts <small> >> Add New Post</small></h3>
            </div>
        </div>

        <div class="row">
            <div class="col-sm-12">
                <div class="panel panel-default">
                    <div class="panel-heading">
                        <h3 class="panel-title">New Post Form</h3>
                    </div>
                    <div class="panel-body">
                        
                        @include('admin.partials.error')

                        <form action="{{ route("admin.post.store") }}" method="POST" class="form-horizontal">
                            <input type="hidden" name="_token" value="{{ csrf_token() }}">
                            @include('admin.post._form')
                            <div class="col-md-8">
                                <div class="form-group">
                                    <div class="col-md-10 col-md-offset-2">
                                        <button class="btn btn-primary btn-lg" type="submit">
                                            <i class="fa fa-disk-o"></i>
                                            Save New Post
                                        </button>
                                    </div>
                                </div>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>
@endsection
{{--scripts--}}
@section('scripts')
    <script src="/assets/pickadate/picker.js"></script>
    <script src="/assets/pickadate/picker.date.js"></script>
    <script src="/assets/pickadate/picker.time.js"></script>
    <script src="/assets/selectize/selectize.min.js"></script>
    <script>
        $(function() {
            $("#publish_date").pickadate({
                format: "mmm-d-yyyy"
            });
            $("#publish_time").pickatime({
                format: "h:i A"
            });
            $("#tags").selectize({
                create: true
            });
        });
    </script>
@endsection

创建我们在上面用到的_form.blade.php：

<div class="row">
    <div class="col-md-8">
        <div class="form-group">
            <label for="title" class="col-md-2 control-label">
                Title
            </label>
            <div class="col-md-10">
                <input type="text" class="form-control" name="title" autofocus id="title" value="{{ $title }}">
            </div>
        </div>
        <div class="form-group">
            <label for="subtitle" class="col-md-2 control-label">
                Subtitle
            </label>
            <div class="col-md-10">
                <input type="text" class="form-control" name="subtitle" id="subtitle" value="{{ $subtitle }}">
            </div>
        </div>
        <div class="form-group">
            <label for="page_image" class="col-md-2 control-label">
                Page Image
            </label>
            <div class="col-md-10">
                <div class="row">
                    <div class="col-md-8">
                        <input type="text" class="form-control" name="page_image" id="page_image" onchange="handle_image_change()" alt="Image thumbnail" value="{{ $page_image }}">
                    </div>
                    <script>
                        function handle_image_change() {
                            $("#page-image-preview").attr("src", function () {
                                var value = $("#page_image").val();
                                if ( ! value) {
                                    value = {!! json_encode(config('blog.page_image')) !!};
                                    if (value == null) {
                                        value = '';
                                    }
                                }
                                if (value.substr(0, 4) != 'http' && value.substr(0, 1) != '/') {
                                    value = {!! json_encode(config('blog.uploads.webpath')) !!} + '/' + value;
                                }
                                return value;
                            });
                        }
                    </script>
                    <div class="visible-sm space-10"></div>
                    <div class="col-md-4 text-right">
                        <img src="{{ page_image($page_image) }}" class="img img_responsive" id="page-image-preview" style="max-height:40px">
                    </div>
                </div>
            </div>
        </div>
        <div class="form-group">
            <label for="content" class="col-md-2 control-label">
                Content
            </label>
            <div class="col-md-10">
                <textarea class="form-control" name="content" rows="14" id="content">{{ $content }}</textarea>
            </div>
        </div>
    </div>
    <div class="col-md-4">
        <div class="form-group">
            <label for="publish_date" class="col-md-3 control-label">
                Pub Date
            </label>
            <div class="col-md-8">
                <input class="form-control" name="publish_date" id="publish_date" type="text" value="{{ $publish_date }}">
            </div>
        </div>
        <div class="form-group">
            <label for="publish_time" class="col-md-3 control-label">
                Pub Time
            </label>
            <div class="col-md-8">
                <input class="form-control" name="publish_time" id="publish_time" type="text" value="{{ $publish_time }}">
            </div>
        </div>
        <div class="form-group">
            <div class="col-md-8 col-md-offset-3">
                <div class="checkbox">
                    <label>
                        <input {{ checked($is_draft) }} type="checkbox" name="is_draft">
                        Draft?
                    </label>
                </div>
            </div>
        </div>
        <div class="form-group">
            <label for="tags" class="col-md-3 control-label">
                Tags
            </label>
            <div class="col-md-8">
                <select name="tags[]" id="tags" class="form-control" multiple>
                    @foreach ($allTags as $tag)
                        <option @if (in_array($tag, $tags)) selected @endif value="{{ $tag }}">
                            {{ $tag }}
                        </option>
                    @endforeach
                </select>
            </div>
        </div>
        <div class="form-group">
            <label for="layout" class="col-md-3 control-label">
                Layout
            </label>
            <div class="col-md-8">
                <input type="text" class="form-control" name="layout" id="layout" value="{{ $layout }}">
            </div>
        </div>
        <div class="form-group">
            <label for="meta_description" class="col-md-3 control-label">
                Meta
            </label>
            <div class="col-md-8">
                <textarea class="form-control" name="meta_description" id="meta_description" rows="6">{{ $meta_description }}</textarea>
            </div>
        </div>
    </div>
</div>

上面使用到了一个帮助函数，我们在helper.php中添加这个方法：

/**
 * 如果传进来的参数是true 则返回checked,false放回空字符串。
 *
 * @param $value
 * @return string
 */
function checked($value)
{
    return $value ? 'checked' : '';
}

/**
 * Return img url for headers
 */
function page_image($value = null)
{
    if (empty($value)) {
        $value = config('blog.page_image');
    }
    if (! starts_with($value, 'http') && $value[0] !== '/') {
        $value = config('blog.uploads.webpath') . '/' . $value;
    }

    return $value;
}

4.6 创建表单请求类

class PostCreateRequest extends Request
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'title' => 'required',
            'subtitle' => 'required',
            'content' => 'required',
            'publish_date' => 'required',
            'publish_time' => 'required',
            'layout' => 'required',
        ];
    }

    /**
     * 返回创建模型所需要用的数据。
     *
     * @return array
     */
    public function postFillData()
    {
        $published_at = new Carbon(
            $this->publish_date.' '.$this->publish_time
        );
        return [
            'title' => $this->title,
            'subtitle' => $this->subtitle,
            'page_image' => $this->page_image,
            'content_raw' => $this->get('content'),
            'meta_description' => $this->meta_description,
            'is_draft' => (bool)$this->is_draft,
            'published_at' => $published_at,
            'layout' => $this->layout,
        ];
    }
}

4.7 实现store方法

    public function store(RequestsPostCreateRequest $request)
    {
        $post = Post::create($request->postFillData());
        $post->syncTags($request->get('tags', []));
        
        return redirect()
            ->route('admin.post.index')
            ->withSuccess('New Post Successfully Created.');
    }

4.8 实现syncTags方法

在store方法中使用了Post模型的syncTags方法用于同步标签，在Post模型中创建这个方法：

    public function syncTags(array $tags)
    {
        Tag::addNeededTags($tags);

        if (count($tags)){
            $this->tags()->sync(Tag::whereIn('tag', $tags)->lists('id')->all());
            return;
        }
        $this->tags()->detach();
    }

4.9 实现store方法

现在我们可以实现PostController上的store方法了：

    public function store(RequestsPostCreateRequest $request)
    {
        $post = Post::create($request->postFillData());
        $post->syncTags($request->get('tags', []));

        return redirect()
            ->route('admin.post.index')
            ->withSuccess('New Post Successfully Created.');
    }

5 更新Post

5.1 创建edit视图

@extends('admin.layout')

@section('styles')
    <link href="/assets/pickadate/themes/default.css" rel="stylesheet">
    <link href="/assets/pickadate/themes/default.date.css" rel="stylesheet">
    <link href="/assets/pickadate/themes/default.time.css" rel="stylesheet">
    <link href="/assets/selectize/css/selectize.css" rel="stylesheet">
    <link href="/assets/selectize/css/selectize.bootstrap3.css" rel="stylesheet">
@stop

@section('content')
    <div class="container-fluid">
        <div class="row page-title-row">
            <div class="col-md-12">
                <h3>Posts <small>» Edit Post</small></h3>
            </div>
        </div>

        <div class="row">
            <div class="col-sm-12">
                <div class="panel panel-default">
                    <div class="panel-heading">
                        <h3 class="panel-title">Post Edit Form</h3>
                    </div>
                    <div class="panel-body">

                        @include('admin.partials.error')
                        @include('admin.partials.success')

                        <form class="form-horizontal" role="form" method="POST" action="{{ route('admin.post.update', $id) }}">
                            <input type="hidden" name="_token" value="{{ csrf_token() }}">
                            <input type="hidden" name="_method" value="PUT">

                            @include('admin.post._form')

                            <div class="col-md-8">
                                <div class="form-group">
                                    <div class="col-md-10 col-md-offset-2">
                                        <button type="submit" class="btn btn-primary btn-lg" name="action" value="continue">
                                            <i class="fa fa-floppy-o"></i>
                                            Save - Continue
                                        </button>
                                        <button type="submit" class="btn btn-success btn-lg" name="action" value="finished">
                                            <i class="fa fa-floppy-o"></i>
                                            Save - Finished
                                        </button>
                                        <button type="button" class="btn btn-danger btn-lg" data-toggle="modal" data-target="#modal-delete">
                                            <i class="fa fa-times-circle"></i>
                                            Delete
                                        </button>
                                    </div>
                                </div>
                            </div>

                        </form>

                    </div>
                </div>
            </div>
        </div>

        {{-- 确认删除 --}}
        <div class="modal fade" id="modal-delete" tabIndex="-1">
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="modal-header">
                        <button type="button" class="close" data-dismiss="modal">
                            ×
                        </button>
                        <h4 class="modal-title">Please Confirm</h4>
                    </div>
                    <div class="modal-body">
                        <p class="lead">
                            <i class="fa fa-question-circle fa-lg"></i>
                            Are you sure you want to delete this post?
                        </p>
                    </div>
                    <div class="modal-footer">
                        <form method="POST" action="{{ route('admin.post.destroy', $id) }}">
                            <input type="hidden" name="_token" value="{{ csrf_token() }}">
                            <input type="hidden" name="_method" value="DELETE">
                            <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                            <button type="submit" class="btn btn-danger">
                                <i class="fa fa-times-circle"></i> Yes
                            </button>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>

@stop

@section('scripts')
    <script src="/assets/pickadate/picker.js"></script>
    <script src="/assets/pickadate/picker.date.js"></script>
    <script src="/assets/pickadate/picker.time.js"></script>
    <script src="/assets/selectize/selectize.min.js"></script>
    <script>
        $(function() {
            $("#publish_date").pickadate({
                format: "mmm-d-yyyy"
            });
            $("#publish_time").pickatime({
                format: "h:i A"
            });
            $("#tags").selectize({
                create: true
            });
        });
    </script>
@stop

5.2 生成edit方法

我们创建好edit视图后要生成对应的方法：PostController下的edit方法。

    public function edit($id)
    {
        $data = $this->dispatch(new PostFormFields($id));
        return view('admin.post.edit', $data);
    }

5.3 创建修改用的Request

php artisan make:request PostUpdateRequest

我们的修改用的Request和创建用的Request很相像，所以直接继承就好：

class PostUpdateRequest extends PostCreateRequest
{
    
}

5.4 编辑update方法

    public function update(RequestsPostUpdateRequest $request, $id)
    {
        $data = $request->postFillData();
        $post = Post::findOrFail($id);
        $post->fill($data);
        $post->save();
        $post->syncTags($request->get('tags', []));

        if ($request->get('action') === 'continue'){
            return redirect()->back()->withSuccess('Post saved.');
        }

        return redirect()->route('admin.post.index')->withSuccess('Post saved.');
    }

6 删除Post

修改destroy方法：

    public function destroy($id)
    {
        $post = Post::findOrFail($id);
        // 删除中间表的数据。
        $post->tags()->detach();
        $post->delete();

        return redirect()
            ->route('admin.post.index')
            ->withSuccess('Post deleted.');
    }

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原文地址：https://www.cnblogs.com/sun-kang/p/7702675.html