javascript - 删除关联中的所有对象

Question

给定一个看起来像这样的模型：

App.Parent = Ember.Model.extend(
    children: DS.attr.hasMany('App.Child')
)

App.Child = Ember.Model.extend(
    parent: DS.attr.belongsTo('App.Parent')
)

parent = App.Parent.find(1)

# How do I remove parent and all of it's children?
# This doesn't work since I'm removing elements from an array while iterating it
parent.get('children').forEach( c -> c.deleteRecord() )
parent.deleteRecord()

# Only removing the parent like this won't work either, 
# Ember-data generates some strange PUT requests for every child
parent.deleteRecord()

# I guess I could do this, but it feels really awkward and 
# wrong to use the adapter directly.
# And it also side-steps transactions making bulk updates impossible
App.store.adapter.deleteRecords(App.store, App.Child, parent.get('children'))
parent.deleteRecord()
App.store.commit()

有没有更直接的方法，只删除父级时会产生什么奇怪的 PUT 请求？

Answer 1

也许使用 toArray() 方法http://emberjs.com/api/classes/Ember.ArrayProxy.html#method_toArray应该可以工作，因为您不再直接修改 ManyArray

parent.get('children').toArray().forEach( c -> c.deleteRecord() )

对于子节点上奇怪的 PUT 请求，这是因为在删除父节点时，ember-data 将子节点上的父属性“无效”。

Answer 2

纯 JavaScript 而不是 CoffeeScript，但我认为您将能够转换：

var children = parent.get('children'),
    i = children.length;

while (i--) {
    children[i].deleteRecord();
}