laravel5学习之表表之间的关系

public function up()
    {
        Schema::create(‘articles‘, function(Blueprint $table)
        {
            $table->increments(‘id‘);
            $table->integer(‘user_id‘)->unsigned();
            $table->string(‘title‘);
            $table->string(‘body‘);
            $table->timestamp(‘publish_at‘);
            $table->timestamps();

            $table->foreign(‘user_id‘)
                  ->references(‘id‘)
                  ->on(‘users‘)
                  ->onDelete(‘cascade‘);
        });
    }

  //一篇文章属于一个作者
    public function User(){
        return $this->belongsTo(‘App\User‘);
    }

//一个user有很多文章
    public function articles(){
        return $this->hasMany(‘App\Articles‘);
    }