[英]How to modify Rails 3 form builder
What is the best way to override form_for
?覆盖form_for
的最佳方法是什么?
For example, in every form_for(@post)
,例如,在每个form_for(@post)
中,
I would like to automatically set the <form>
id attribute to @post.object_id
,我想自动将<form>
id 属性设置为@post.object_id
,
and add the following field: hidden_field_tag:form_id, @post.object_id
并添加以下字段: hidden_field_tag:form_id, @post.object_id
Can I do this using alias_method_chain
?我可以使用alias_method_chain
来做到这一点吗?
Technically, you could probably achieve your goal by using alias_method_chain
, but it would require parsing the form and injecting/modifying the content, which could get really ugly, really fast.从技术上讲,您可能可以通过使用alias_method_chain
来实现您的目标,但它需要解析表单并注入/修改内容,这可能会变得非常难看,非常快。
Instead, I'd suggest overriding form_for
with your own custom version (the original source can be seen here http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_for by clicking "show source" at the bottom).相反,我建议用您自己的自定义版本覆盖form_for
(原始来源可以在这里看到http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_for通过单击“显示来源”在底部)。
One way to achieve this is described in a post I wrote recently: http://davidsulc.com/blog/2011/05/01/self-marking-required-fields-in-rails-3/我最近写的一篇文章中描述了实现此目的的一种方法: http://davidsulc.com/blog/2011/05/01/self-marking-required-fields-in-rails-3/
The difference being: instead of overriding the label
method, you'll be rewriting the form_for
method.不同之处在于:您将重写form_for
方法,而不是覆盖label
方法。
PS: out of curiosity, why do you need to expose the object_id
? PS:出于好奇,为什么需要公开object_id
?
This should work (it worked for me):这应该有效(它对我有用):
<%= hidden_field(:post :form_id, :value => @post.object_id) %>
In a Rails helper you can simply do something like:在 Rails 助手中,您可以简单地执行以下操作:
def form_for(record, options = {}, &block)
options[:id] = record.class.to_s + '-' + record.id
super
end
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