底层执行的 SQL 语句一个 NOT EXISTS 查询: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select * from `users` where not exists ( select * from `posts` where `users`.`id` = `posts`.`user_id` and `posts`.`deleted_at` is null ) and `email_verified_at` is not null 如果想要...
select * from `users` where exists ( select * from `posts` where `users`.`id` = `posts`.`user_id` and `posts`.`deleted_at` is null ) and `email_verified_at` is not null 如果你想要进一步过滤发布文章数量大于 1 的用户,可以带上查询条件:Copy Highlighter-hljs$users = User::has('...
AI代码解释 // Models/Course.phppublicfunctionstudents():BelongsToMany{return$this->belongsToMany(Student::class);}publicfunctionteacher():hasOne{return$this->hasOne(Teacher::class);} 一旦模型间的关系定义完成,我们就可以非常方便的通过 Laravel Eloquent 查询它们之间的数据关系。Laravel 会自动帮我们处理...
第二个参数是当前模型类所属表的外键,在本例中是 user_profiles 表的 user_id 字段,拼接规则和 hasOne 那里类似,只不过这里是基于第四个参数关联关系名称 $relation: Copy Highlighter-hljs if(is_null($relation)) {$relation=$this->guessBelongsToRelation(); } ...if(is_null($foreignKey)) {$foreign...
namespaceIlluminate\Database\Eloquent\Relations;...abstractclassHasOneOrManyextendsRelation{useInteractsWithDictionary;...publicfunctionaddConstraints(){if(static::$constraints){$query=$this->getRelationQuery();$query->where($this->foreignKey,'=',$this->getParentKey());$query->whereNotNull($this...
$query->whereIn('email', ['taylor@laravel.com', 'david@laravel.com']); }); } }), Limiting Relation ResultsYou can limit the number of results that are returned when searching the field by defining a relatableSearchResults property on the class of the resource that you are ...
字符串Controller（App\Http\Controller\PostController.php）：要使用where条件访问hasMany关系，可以使用...
return $this->belongsToMany('App\Role')->wherePivot('approved', 1); return $this->belongsToMany('App\Role')->wherePivotIn('priority', [1, 2]); return $this->belongsToMany('App\Role')->wherePivotNotIn('priority', [1, 2]);...
传递给 hasOneThrough 方法的第一个参数是我们希望访问的最终模型的名称,而第二个参数是中间模型的名称。或者,如果相关的关联已经在关联中涉及的所有模型上被定义,你可以通过调用 through 方法和提供这些关联的名称来流式定义一个「远程一对一」关联。例如,Mechanic 模型有一个 cars 关联,Car 模型有一个 owner ...
Though the history table does not contain a supplier_id column, the hasOneThrough relation can provide access to the user's history to the supplier model. Now that we have examined the table structure for the relationship, let's define it on the Supplier model:...