如何解决Laravel + VueJS完成系统
我已经花了好几个小时来为完成系统定义我的关系,但是我失败了。
我有一个表Users和一个表Episodes,如果用户已完成一集,我想进入我的视图。
我用user_id和Episode_id和一个名为“ completed”的布尔字段创建了一个“ completions”表
这有很多关系吗?我想要一个类似$ episode-> completed的东西,如果登录的用户完成了课程,则给我True,但是我找不到自己的路...我只想知道如何定义我的关系,而不是整体完成的工作。
非常感谢您!!!!
解决方法
我相信您可以告诉Laravel使用哪个表,还可以查询数据透视列。
//user model
public function episodes(){
return $this->belongsToMany( 'App\Episode','completions','user_id','episode_id' );
}
public function completedEpisodes(){
return $this->belongsToMany( 'App\Episode','episode_id' )
->wherePivot('completed','=',true)->get();
}
//episode model
public function users(){
return $this->belongsToMany( 'App\User','episode_id','user_id' );
}
另一种选择是创建您的数据透视表,因为Episode_user和laravel会自动将其检测为数据透视表,向该表中添加一个完整的布尔值,并且它将仅使用:
//user model
public function episodes(){
return $this->belongsToMany('App\Episode');
}
public function completedEpisodes(){
return $this->belongsToMany('App\Episode')
->wherePivot('completed',true)->get();
}
//episode model
public function users(){
return $this->belongsToMany('App\User');
}
查询剧集是否完整:
//也许没有尝试过
//user
public function hasCompletedEpisode($id){
return $this->belongsToMany('App\Episode')->wherePivot('episode_id',$id)
->wherePivot('completed',true)->get();
}
//episode
public function hasCompletedEpisode($id){
$user_id = Auth::id();
return $this->belongsToMany('App\User')->wherePivot('user_id',$user_id)
->wherePivot('completed',true)->get();
}
,
如果我是你,我会使用custom intermediate table。您可以按以下方式实现此功能:
迁移
Schema::create('users',function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name');
$table->timestamps();
});
Schema::create('episodes',function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name');
$table->timestamps();
});
Schema::create('watches',function (Blueprint $table) {
$table->bigIncrements('id');
$table->unsignedBigInteger('user_id');
$table->unsignedBigInteger('epsiode_id');
$table->boolean('completed');
$table->timestamps();
});
模型
class User extends Model
{
protected $guarded = [];
public function watchedEpisodes()
{
return $this->hasMany(Episode::class)->using(Watch::class);
}
public function watches()
{
return $this->hasMany(Watch::class);
}
}
class Episode extends Model
{
protected $guarded = [];
public function users()
{
return $this->hasMany(User::class)->using(Watch::class);
}
}
class Watch extends \Illuminate\Database\Eloquent\Relations\Pivot
{
protected $table = 'watches';
protected $guarded = [];
public static function create(User $user,Episode $episode,bool $completed = false)
{
$watch = new self();
$watch->user_id = $user->id;
$watch->epsiode_id = $episode->id;
$watch->completed = $completed;
$watch->save();
return $watch;
}
public function user()
{
return $this->hasOne(User::class);
}
public function episode()
{
return $this->hasOne(User::class);
}
}
示例用法
$user = User::create(['name' => 'Big Watcher']);
$episode1 = Episode::create(['name' => 'Episode 1']);
$episode2 = Episode::create(['name' => 'Episode 2']);
$episode3 = Episode::create(['name' => 'Episode 3']);
$episode4 = Episode::create(['name' => 'Episode 4']);
Watch::create($user,$episode1);
Watch::create($user,$episode2);
Watch::create($user,$episode3);
return $user->watchedEpisodes;
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。