如何修复错误 Base table or view not found： 1146 Table laravel 关系表

我是一个新手，我试图在表之间建立多对多的关系，我的问题是当我在数据库中插入数据时，我遇到了错误

查询连接中的异常.php第713行:SQLSTATE[42S02]:找不到基表或视图:1146 table'learn.类别_posts'不存在(SQL:插入category_posts(category_idposts_id)个值(4，))

有谁能帮帮我吗？下面是我的迁移和代码:

2016_08_04_131009_create_table_posts.php

public function up()
{
    Schema::create('posts', function (Blueprint $table) {
        $table->increments('id');
        $table->text('title');
        $table->text('body');
        $table->timestamps();
    });
}

2016_08_04_131053_create_table_categories.php

public function up()
{
    Schema::create('categories', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name');
        $table->timestamps();
    });
}

2016_08_04_131413_创建_表格_类别_帖子.php

public function up()
{
    Schema::create('category_post', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('category_id')->unsigned();
        $table->integer('post_id')->unsigned();
        $table->foreign('category_id')->references('id')->on('categories')->onUpdate('cascade')->onDelete('cascade');
        $table->foreign('post_id')->references('id')->on('posts')->onUpdate('cascade')->onDelete('cascade');
        $table->timestamps();
    });
}

and my model Posts.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Posts extends Model
{
    protected $table = 'posts';

    public function categories()
    {
        return $this->belongsToMany('App\Category');
    }
}

Category.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Category extends Model
{
    protected $table = 'categories'; 

    public function posts()
    {
        return $this->belongsToMany('App\Posts');
    }   
}

我的邮差.php

public function create()
{
    $categories = Category::all();
    return view('create',compact('categories'));
}

public function store(Request $request)
{
   $post = new Posts;
   $post->title = $request->title;
   $post->body = $request->body;
   $post->categories()->attach($request->categories_id);

    return redirect()->route('posts.index');
}

我的视图创建.刀身php

{!!Form::open(array('route' => 'store', 'method' => 'POST'))!!}

    {{Form::text('title')}}<br>
    {{Form::textarea('body')}}<br>
    <select name="categories_id" multiple>
        @foreach ($categories as $category)
            <option value="{{ $category->id }}">{{ $category->name }}</option>
        @endforeach
    </select>
    <br>
    {{Form::submit('submit')}}

{!!Form::close()!!}