Ruby-on-rails Rails - SimpleForm 中默认选中的单选按钮：collection
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Rails - Default selected radiobutton in SimpleForm :collection
提问by mswiszcz
I've litte problem with radiobuttons in SimpleForm.
我对 SimpleForm 中的单选按钮有一些小问题。
When i use
当我使用
= f.association :manufactureType, :collection => ManufactureType.all, :as => :radio
Rails simply generates few radiobuttons, but none of them are selected. I want first radiobutton to be selected by default. How can i make it?
Rails 只生成很少的单选按钮，但没有一个被选中。我希望默认选择第一个单选按钮。我怎样才能做到？
Thanks
谢谢
回答by Domness
If you pass in the manufacture types into the view, you can do the following:
如果您将制造类型传递到视图中，您可以执行以下操作：
:checked => @manufacture_types[0]
Or
或者
:checked => ManufactureType.first
回答by penner
My example was slightly more complicated, none of the other answers worked for me since there was no collection or model to reference.
我的例子稍微复杂一些，其他答案都不适合我，因为没有可供参考的集合或模型。
= f.input :attending, as: :radio_buttons, :collection => [ ['Yes', true], ['No', false] ], :checked => ['Yes', true]
回答by schpet
from op's comment, adding this parameter worked for me:
根据 op 的评论，添加此参数对我有用：
:checked => 1
回答by The Whiz of Oz
Here is an excerpt of my code which works:
这是我的代码的摘录：
= f.input :body_format,
collection: [['markdown', 'Markdown']],
label_method: :last,
value_method: :first,
as: :radio_buttons,
checked: 'markdown', # THIS
required: true
