public function follow(Request $request, FeedModel $model, FeedRepository $repository)

    {

        if (is_null($user = $request->user('api'))) {

            abort(401);

        }

        $limit = $request->query('limit', 15);

        $after = $request->query('after');

        $feeds = $model->leftJoin('user_follow', function ($join) use ($user) {

            $join->where('user_follow.user_id', $user->id);

        })

            ->whereDoesntHave('blacks', function ($query) use ($user) {

                $query->where('user_id', $user);

            })

            ->where(function ($query) use ($user) {

                $query->whereColumn('feeds.user_id', '=', 'user_follow.target')

                    ->orWhere('feeds.user_id', $user->id);

            })

            ->with([

                'user' => function ($query) {

                    return $query->withTrashed();

                },

                'topics' => function ($query) {

                    return $query->select('id', 'name');

                },

                'user.certification',

                'pinnedComments' => function ($query) {

                    return $query->with([

                        'user',

                        'user.certification',

                    ])

                    ->where('expires_at', '>', new Carbon)

                    ->orderBy('amount', 'desc')

                    ->orderBy('created_at', 'desc');

                },

            ])

            ->when((bool) $after, function ($query) use ($after) {

                return $query->where('feeds.id', '<', $after);

            })

            ->distinct()

            ->select('feeds.*')

            ->orderBy('feeds.id', 'desc')

            ->limit($limit)

            ->get();

        return $feeds->map(function (FeedModel $feed) use ($repository, $user) {

            $feed->feed_view_count += 1;

            $feed->hot = $feed->makeHotValue();

            $feed->save();

            $repository->setModel($feed);

            $repository->images();

            $repository->format($user->id);

            $repository->previewComments();

            $feed->has_collect = $feed->collected($user->id);

            $feed->has_like = $feed->liked($user);

            return $feed;

        });

    }