php - BadMethodCallException with message 'Call to undefined method Illuminate\Database\Query\Builder::belongToMany()' -

following instructions in laracast :

https://laracasts.com/series/laravel-5-fundamentals/episodes/21

i created channel model

class channel extends model {     //     protected $fillable = [         'title',         'description',         'published_at',      ];      public function scopepublished($query) {         $query->where('published_at', '<=', carbon::now());     }      public function setpublishedatattribute($date) {         $this->attributes['published_at'] = carbon::createfromformat('y-m-d', $date);        }     /*     * tags associated given channel     *     */     public function tags() {         return $this->belongstomany('app\tag'); //tag_id     } } 

and tag model

class tag extends model {     //     protected $fillable = [         'name', 'description',     ];     /**     * channels associated given tag     */     public function channels() {         return $this->belongtomany('app\channel'); //channel_id     } } 

so there's many-to-many relation betweeen channel , tag through pivot table.

my migrations follows

use illuminate\database\schema\blueprint; use illuminate\database\migrations\migration;  class createchannelstable extends migration {     /**      * run migrations.      *      * @return void      */     public function up()     {         schema::create('channels', function (blueprint $table) {             $table->increments('id');             $table->string('title');             $table->text('description');             $table->text('url');             $table->text('channelposter');             $table->timestamp('published_at');             $table->timestamps();         });     }      /**      * reverse migrations.      *      * @return void      */     public function down()     {         schema::drop('channels');     } } 

and

use illuminate\database\schema\blueprint; use illuminate\database\migrations\migration;  class createtagstable extends migration {     /**      * run migrations.      *      * @return void      */     public function up()     {         schema::create('tags', function (blueprint $table) {             $table->increments('id');             $table->string('name');             $table->string('description');             $table->timestamps();          });         //channel_tag         schema::create('channel_tag', function(blueprint $table) {             $table->integer('channel_id')->unsigned()->index();             $table->foreign('channel_id')->references('id')->on('channels')->ondelete('cascade');              $table->integer('tag_id')->unsigned()->index();             $table->foreign('tag_id')->references('id')->on('tags')->ondelete('cascade');             $table->timestamps();         });        }      /**      * reverse migrations.      *      * @return void      */     public function down()     {         schema::drop('tags');         schema::drop('channel_tag');     } } 

however, when use artisan tinker connect channel tag follows :

==> php artisan  tinker psy shell v0.6.1 (php 5.6.16 — cli) justin hileman >>> $channel=app\channel::first(); => app\channel {#660      id: 1,      title: "test1",      description: "test1",      url: "",      channelposter: "",      published_at: "2016-01-06 02:54:20",      created_at: "2016-01-06 02:54:20",      updated_at: "2016-01-06 02:54:20",    } >>> $tag = new app\tag; => app\tag {#649} >>> $tag->name = "recommended"; => "recommended" >>> $tag->description = "recommended"; => "recommended" >>> $tag->save(); => true >>> db::select('select * channel_tag'); => [] >>> $channel->tags()->attach(1); => null >>> db::select('select * channel_tag'); => [      {#658        +"channel_id": 1,        +"tag_id": 1,        +"created_at": "2016-01-05 21:56:46",        +"updated_at": "0000-00-00 00:00:00",      },    ] >>> $tag->channels->toarray(); badmethodcallexception message 'call undefined method illuminate\database\query\builder::belongtomany()' 

this not making sense , feels might bug i'm not sure. i'm using laravel framework version 5.2.6 , php 5.6.16

belongstomany not belongtomany

public function channels() {     return $this->belongstomany('app\channel'); //channel_id }