Add user following

Author: summerblue

app/Http/Controllers/FollowersController.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+
+use App\Http\Requests;
+use App\Http\Controllers\Controller;
+
+use App\Models\User;
+use Auth;
+
+class FollowersController extends Controller
+{
+    public function __construct()
+    {
+        $this->middleware('auth', [
+            'store', 'destroy'
+        ]);
+    }
+
+    public function store($id)
+    {
+        $user = User::findOrFail($id);
+
+        if (Auth::user()->id === $user->id) {
+            return redirect('/');
+        }
+
+        if (!Auth::user()->isFollowing($id)) {
+            Auth::user()->follow($id);
+        }
+
+        return redirect()->route('users.show', $id);
+    }
+
+    public function destroy($id)
+    {
+        $user = User::findOrFail($id);
+
+        if (Auth::user()->id === $user->id) {
+            return redirect('/');
+        }
+
+        if (Auth::user()->isFollowing($id)) {
+            Auth::user()->unfollow($id);
+        }
+
+        return redirect()->route('users.show', $id);
+    }
+}

app/Http/Controllers/UsersController.php

@@ -17,7 +17,7 @@ class UsersController extends Controller
     public function __construct()
     {
         $this->middleware('auth', [
-            'only' => ['edit', 'update', 'destroy']
+            'only' => ['edit', 'update', 'destroy', 'followings', 'followers']
         ]);
 
         $this->middleware('guest', [
@@ -127,4 +127,20 @@ public function confirmEmail($token)
         session()->flash('success', '恭喜你，激活成功！');
         return redirect()->route('users.show', [$user]);
     }
+
+    public function followings($id)
+    {
+        $user = User::findOrFail($id);
+        $users = $user->followings()->paginate(30);
+        $title = '关注的人';
+        return view('users.show_follow', compact('users', 'title'));
+    }
+
+    public function followers($id)
+    {
+        $user = User::findOrFail($id);
+        $users = $user->followers()->paginate(30);
+        $title = '粉丝';
+        return view('users.show_follow', compact('users', 'title'));
+    }
 }

app/Http/routes.php

@@ -19,3 +19,8 @@
 post('password/reset', 'Auth\PasswordController@postReset')->name('password.update');
 
 resource('statuses', 'StatusesController', ['only' => ['store', 'destroy']]);
+
+get('/users/{id}/followings', 'UsersController@followings')->name('users.followings');
+get('/users/{id}/followers', 'UsersController@followers')->name('users.followers');
+post('/users/followers/{id}', 'FollowersController@store')->name('followers.store');
+delete('/users/followers/{id}', 'FollowersController@destroy')->name('followers.destroy');

app/Models/User.php

@@ -10,6 +10,8 @@
 use Illuminate\Contracts\Auth\Access\Authorizable as AuthorizableContract;
 use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;
 
+use Auth;
+
 class User extends Model implements AuthenticatableContract,
                                     AuthorizableContract,
                                     CanResetPasswordContract
@@ -64,7 +66,41 @@ public function statuses()
 
     public function feed()
     {
-        return $this->statuses()
-                    ->orderBy('created_at', 'desc');
+        $user_ids = Auth::user()->followings->pluck('id')->toArray();
+        array_push($user_ids, Auth::user()->id);
+        return Status::whereIn('user_id', $user_ids)
+                              ->with('user')
+                              ->orderBy('created_at', 'desc');
+    }
+
+    public function followers()
+    {
+        return $this->belongsToMany(User::Class, 'followers', 'user_id', 'follower_id');
+    }
+
+    public function followings()
+    {
+        return $this->belongsToMany(User::Class, 'followers', 'follower_id', 'user_id');
+    }
+
+    public function follow($user_ids)
+    {
+        if (!is_array($user_ids)) {
+            $user_ids = compact('user_ids');
+        }
+        $this->followings()->sync($user_ids, false);
+    }
+
+    public function unfollow($user_ids)
+    {
+        if (!is_array($user_ids)) {
+            $user_ids = compact('user_ids');
+        }
+        $this->followings()->detach($user_ids);
+    }
+
+    public function isFollowing($user_id)
+    {
+        return $this->followings->contains($user_id);
     }
 }

database/migrations/2016_12_18_013048_create_followers_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateFollowersTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('followers', function (Blueprint $table) {
+            $table->increments('id');
+            $table->integer('user_id')->index();
+            $table->integer('follower_id')->index();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::drop('followers');
+    }
+}

database/seeds/DatabaseSeeder.php

@@ -16,6 +16,7 @@ public function run()
 
         $this->call('UsersTableSeeder');
         $this->call('StatusesTableSeeder');
+        $this->call('FollowersTableSeeder');
 
         Model::reguard();
     }

database/seeds/FollowersTableSeeder.php

@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Seeder;
+use App\Models\User;
+
+class FollowersTableSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     *
+     * @return void
+     */
+    public function run()
+    {
+        $users = User::all();
+        $user = $users->first();
+        $user_id = $user->id;
+
+        // 获取去除掉 ID 为 1 的所有用户 ID 数组
+        $followers = $users->slice(1);
+        $follower_ids = $followers->pluck('id')->toArray();
+
+        // 关注除了 1 号用户以外的所有用户
+        $user->follow($follower_ids);
+
+        // 除了 1 号用户以外的所有用户都来关注 1 号用户
+        foreach ($followers as $follower) {
+            $follower->follow($user_id);
+        }
+    }
+}

public/css/app.css

@@ -160,8 +160,56 @@ section.user_info {
   border-radius: 50%;
 }
 
+.stats {
+  overflow: auto;
+  margin-top: 0;
+  padding: 0;
+  a {
+    float: left;
+    padding: 0 10px;
+    text-align: center;
+    width: 33%;
+    border-left: 1px solid $gray-lighter;
+    color: gray;
+    &:first-child {
+      padding-left: 0;
+      border: 0;
+    }
+    &:hover {
+      text-decoration: none;
+      color: #337ab7;
+    }
+  }
+  strong {
+    display: block;
+    font-size: 1.2em;
+    color: black;
+  }
+}
+
+.user_avatars {
+  overflow: auto;
+  margin-top: 10px;
+  .gravatar {
+    margin: 1px 1px;
+  }
+  a {
+    padding: 0;
+  }
+}
+
+.users.follow {
+  padding: 0;
+}
+
 /* forms */
 
+#follow_form button {
+  margin: 0 auto;
+  display: block;
+  margin-top: 25px;
+}
+
 input, textarea, select, .uneditable-input {
   border: 1px solid #bbb;
   width: 100%;