有没有办法轻松克隆Eloquent对象,包括它的所有关系?
例如,如果我有这些表:
users ( id, name, email )
roles ( id, name )
user_roles ( user_id, role_id )
除了在users
表中创建一个新行,除了id
之外所有列都相同,它还应该在user_roles
表中创建一个新行,为新用户分配相同的角色。
像这样的东西:
$user = User::find(1);
$new_user = $user->clone();
用户模型的位置
class User extends Eloquent {
public function roles() {
return $this->hasMany('Role', 'user_roles');
}
}
在laravel 4.2中测试了belongsToMany的关系
如果你在模特中:
//copy attributes
$new = $this->replicate();
//save model before you recreate relations (so it has an id)
$new->push();
//reset relations on EXISTING MODEL (this way you can control which ones will be loaded
$this->relations = [];
//load relations on EXISTING MODEL
$this->load('relation1','relation2');
//re-sync everything
foreach ($this->relations as $relationName => $values){
$new->{$relationName}()->sync($values);
}
您也可以尝试eloquent提供的复制功能:
http://laravel.com/api/4.2/Illuminate/Database/Eloquent/Model.html#method_replicate
$user = User::find(1);
$new_user = $user->replicate();
$new_user->push();
你可以试试这个(Object Cloning):
$user = User::find(1);
$new_user = clone $user;
由于clone
没有深度复制,因此如果有任何子对象可用,则不会复制子对象,在这种情况下,您需要手动使用clone
复制子对象。例如:
$user = User::with('role')->find(1);
$new_user = clone $user; // copy the $user
$new_user->role = clone $user->role; // copy the $user->role
在你的情况下,roles
将是Role
对象的集合,因此集合中的每个Role object
都需要使用clone
手动复制。
此外,您需要注意这一点,如果您不使用roles
加载with
,那么这些将不会加载或在$user
中不可用,当您调用$user->roles
时,那些对象将在运行时加载在$user->roles
召唤之后的时间,直到这个,那些roles
没有加载。
这个答案是针对Larave-4
的,现在Laravel提供了replicate()
方法,例如:
$user = User::find(1);
$newUser = $user->replicate();
// ...
对于Laravel 5.使用hasMany关系进行测试。
$model = User::find($id);
$model->load('invoices');
$newModel = $model->replicate();
$newModel->push();
foreach($model->getRelations() as $relation => $items){
foreach($items as $item){
unset($item->id);
$newModel->{$relation}()->create($item->toArray());
}
}
以下是来自@ sabrina-gelbart的解决方案的更新版本,它将克隆所有hasMany关系,而不仅仅是她发布的belongsToMany:
//copy attributes from original model
$newRecord = $original->replicate();
// Reset any fields needed to connect to another parent, etc
$newRecord->some_id = $otherParent->id;
//save model before you recreate relations (so it has an id)
$newRecord->push();
//reset relations on EXISTING MODEL (this way you can control which ones will be loaded
$original->relations = [];
//load relations on EXISTING MODEL
$original->load('somerelationship', 'anotherrelationship');
//re-sync the child relationships
$relations = $original->getRelations();
foreach ($relations as $relation) {
foreach ($relation as $relationRecord) {
$newRelationship = $relationRecord->replicate();
$newRelationship->some_parent_id = $newRecord->id;
$newRelationship->push();
}
}
如果你有一个名为$ user的集合,使用下面的代码,它会创建一个与旧集合相同的新集合,包括所有关系:
$new_user = new \Illuminate\Database\Eloquent\Collection ( $user->all() );
此代码适用于laravel 5。
这是在laravel 5.8,在旧版本中没有尝试过
//# this will clone $eloquent and asign all $eloquent->$withoutProperties = null
$cloned = $eloquent->cloneWithout(Array $withoutProperties)
编辑,就在今天,即2019年4月7日laravel 5.8.10 launched
现在可以使用复制
$post = Post::find(1);
$newPost = $post->replicate();
$newPost->save();
当您通过任何您想要的关系获取对象,并在此之后复制时,您复制的所有关系也会被复制。例如:
$oldUser = User::with('roles')->find(1);
$newUser = $oldUser->replicate();
如果其他解决方案不能安抚你,这是另一种方法:
<?php
/** @var \App\Models\Booking $booking */
$booking = Booking::query()->with('segments.stops','billingItems','invoiceItems.applyTo')->findOrFail($id);
$booking->id = null;
$booking->exists = false;
$booking->number = null;
$booking->confirmed_date_utc = null;
$booking->save();
$now = CarbonDate::now($booking->company->timezone);
foreach($booking->segments as $seg) {
$seg->id = null;
$seg->exists = false;
$seg->booking_id = $booking->id;
$seg->save();
foreach($seg->stops as $stop) {
$stop->id = null;
$stop->exists = false;
$stop->segment_id = $seg->id;
$stop->save();
}
}
foreach($booking->billingItems as $bi) {
$bi->id = null;
$bi->exists = false;
$bi->booking_id = $booking->id;
$bi->save();
}
$iiMap = [];
foreach($booking->invoiceItems as $ii) {
$oldId = $ii->id;
$ii->id = null;
$ii->exists = false;
$ii->booking_id = $booking->id;
$ii->save();
$iiMap[$oldId] = $ii->id;
}
foreach($booking->invoiceItems as $ii) {
$newIds = [];
foreach($ii->applyTo as $at) {
$newIds[] = $iiMap[$at->id];
}
$ii->applyTo()->sync($newIds);
}
诀窍是擦除id
和exists
属性,以便Laravel创建一个新记录。
克隆自我关系有点棘手但我已经包含了一个例子。您只需创建旧ID到新ID的映射,然后重新同步。