Rails Accepts_nested_attributes_for _destroy 不起作用，除非关联已经加载
Rails 3.0.5 似乎不会使用 accepts_nested_attributes_for 销毁父对象的子对象，除非子对象已加载。有谁知道这是否是设计使然？我觉得有点奇怪。这是设置。
class Foo < AR
has_many :bars
accepts_nested_attributes_for :bars, :allow_destroy => true
end
class Bar < AR
belongs_to :foo
end
# create a Foo with 5 bars (ie. Foo.create :bars_attributes => ... )
# then fetch a foo, without its bars
f = Foo.find(1)
f.update_attributes("bars_attributes" => {"id" => "1", "_destroy" => "1"})
Foo.find(1).bars.length # => 5
f = Foo.find(1, :include => :bars)
f.update_attributes("bars_attributes" => {"id" => "1", "_destroy" => "1"})
Foo.find(1).bars.length # => 4
Rails 3.0.5 doesn't seem to destroy children of a parent object using accepts_nested_attributes_for unless the children are loaded. Does anyone know if this is by design? It seems a bit odd to me. Here's the setup.
class Foo < AR
has_many :bars
accepts_nested_attributes_for :bars, :allow_destroy => true
end
class Bar < AR
belongs_to :foo
end
# create a Foo with 5 bars (ie. Foo.create :bars_attributes => ... )
# then fetch a foo, without its bars
f = Foo.find(1)
f.update_attributes("bars_attributes" => {"id" => "1", "_destroy" => "1"})
Foo.find(1).bars.length # => 5
f = Foo.find(1, :include => :bars)
f.update_attributes("bars_attributes" => {"id" => "1", "_destroy" => "1"})
Foo.find(1).bars.length # => 4
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Foo#bars是一个has_many，因此它会期望不止 1 个东西，这意味着一个Array。尝试传递Hash的Array，如下所示：Foo#barsis ahas_manyso it will be expecting more than 1 thing, which means anArray. Try passing anArrayofHashlike so: