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使用with时
with()方法是用作“渴求式加载”的，那主要意味着，laravel将会伴随着主要模型预加载出确切的的关联关系。这就对那些如果你想加在一个模型的所有关联关系非常有帮助。因为“渴求式加载”缓解了1+N的查询问题，仅需1+1次查询就能解决问题，对查询速度有了质的提升。支持过滤条件
$groupInfo =
$this->class::where('site_id',$id)->with(['group'=>function($query){
$query->where('group_is_delete', 0); }])->get();
使用has时
has()方法是基于关联关系去过滤模型的查询结果，所以它的作用和where条件非常相似。如果你只使用has(‘site’),这表示你只想得到这个模型，这个模型的至少存在一个post的关联关系。
$user = User::has('site.site_id', ‘>’, '3')->get();
使用wherehas时 whereHas()方法的原理基本和has()方法相同，但是他允许你自己添加对这个模型的过滤条件。
$users = User::whereHas('site', function($q){ $q->where('site_created_at',
'>=', '2019-08-12'); })->get(); // 只返回用户的post记录在2019年08月12之后的数据
