public function upvoters()
    {
        return $this->morphToMany(config('follow.user_model'), config('follow.morph_prefix'), config('follow.followable_table'))
                    ->wherePivot('relation', '=', Follow::RELATION_UPVOTE)
                    ->withPivot('followable_type', 'relation', 'created_at');
    }
public function upvoters()
    {
        return $this->morphToMany(config('follow.user_model'), config('follow.morph_prefix'), config('follow.followable_table'))
                    ->wherePivot('relation', '=', Follow::RELATION_UPVOTE)
                    ->withPivot('followable_type', 'relation', 'created_at');
    }
public function upvoters ( ) { return $ this -> morphToMany ( config ( 'follow.user_model' ) , config ( 'follow.morph_prefix' ) , config ( 'follow.followable_table' ) ) -> wherePivot ( 'relation' , '=' , Follow :: RELATION_UPVOTE ) -> withPivot ( 'followable_type' , 'relation' , 'created_at' ) ; }
Return upvoters.

@return \Illuminate\Database\Eloquent\Relations\BelongsToMany
Return upvoters .