问我可以在不持久化的情况下移除Mongoid中嵌入的文档吗？

EN

class MyParent
  include Mongoid::Document

  field :name, type: String
  embeds_many :my_children

  def remove_my_child(child)
    assign_attributes(my_children: my_children.select { |c| c != child })
  end
end

class MyChild
  include Mongoid::Document

  embedded_in :my_parent

  def remove
    parent.remove_my_child(self)
  end
end

my_parent = MyParent.first
my_first_child = my_parent.my_children.first

# no mongo queries are executed
my_first_child.remove

# now we can make another change with no query executed
my_parent.name = 'foo'

# and finally we can save the whole thing in one query which is the
# reason we used an embedded document in the first place, right?
my_parent.save!

update_all()

User.update_all(name: 'Joe')