Rails own_to 和单表继承行为不正常
我有一个 Bike 模型和一个 Component 模型。几个模型继承自 Component：Frame、Chain、Crankset 等。
当我提交表单时，我的参数看起来像这样：
"bike" => { "frame" => { "id" => "4" }, "chain" => { "id" => "19" }, ... }
在我的控制器中，以下代码中断：
@bike = Bike.new(params[:bike])
> Frame(#90986230) expected, got HashWithIndifferentAccess(#81888970)
如果我破解表单以生成以下参数，它会起作用：
"bike" => { "frame_id" => "4", "chain_id" => "19" ... }
这是我的模型：
class Bike < ActiveRecord::Base
belongs_to :frame
belongs_to :chain
...
end
class Component < ActiveRecord::Base
has_many :bikes
end
class Frame < Component
end
单表继承正在工作 - 我可以调用 Frame.first 并Component.all 没有问题。
我要疯了吗？嵌套参数不是通常的约定吗？这就是产生的：
- f.fields_for @bike.frame do |frame|
= frame.hidden_field :id
我做错了什么？
I have a Bike model and a Component model. Several models inherit from Component: Frame, Chain, Crankset etc.
When I submit my form, my params look like this:
"bike" => { "frame" => { "id" => "4" }, "chain" => { "id" => "19" }, ... }
In my controller, the following code breaks:
@bike = Bike.new(params[:bike])
> Frame(#90986230) expected, got HashWithIndifferentAccess(#81888970)
If I hack my form to generate the following params, it works:
"bike" => { "frame_id" => "4", "chain_id" => "19" ... }
Here's my models:
class Bike < ActiveRecord::Base
belongs_to :frame
belongs_to :chain
...
end
class Component < ActiveRecord::Base
has_many :bikes
end
class Frame < Component
end
Single table inheritance is working - I can call Frame.first and Component.all without issue.
Am I going insane? Isn't the nested params the usual convention? That's what gets generated by:
- f.fields_for @bike.frame do |frame|
= frame.hidden_field :id
What am I doing wrong??
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您正在使用嵌套表单，因此如果您使用
accepts_nested_attributes_for标记，则嵌套参数应该有效（请参阅railscast 196/197)。You are using nested forms, so nested params should work if you use the
accepts_nested_attributes_fortag (see railscast 196/197).