[英]How do input field methods (text_area, text_field, etc.) get attribute values from a record within a form_for block?
I have a standard Rails 2.3.5 app with a model called Post. 我有一个标准的Rails 2.3.5应用程序,模型名为Post。 Post has an attribute called url, and the following getter is defined:
Post具有一个称为url的属性,并定义了以下getter:
def url
p = 'http://'
u = self[:url]
u.starts_with?(p) ? u : "#{p}#{u}"
end
If I load up script/console
, I can do Post.first.url
and get the desired result (eg it returns http://foo.com if the attribute's true value is foo.com) 如果加载
script/console
,则可以执行Post.first.url
并获得所需的结果(例如,如果属性的真实值为foo.com,则返回http://foo.com )
However, if I have a form_for
block, and do something like form.text_field :url
, it will not return the url with http:// prefixed; 但是,如果我有一个
form_for
块,并执行类似form.text_field :url
,它将不会返回带有http://前缀的url; rather, it simply returns foo.com 相反,它只是返回foo.com
How does form_for access attributes on ActiveRecord models? ActiveRecord模型上的form_for访问属性如何? It seems to bypass any overloaded getters.
它似乎绕过了任何重载的吸气剂。
def url_before_type_cast
p = 'http://'
u = self[:url].capitalize
u.starts_with?(p) ? u : "#{p}#{u}"
end
By returns to you mean sets? 所谓的收益是指集?
The text field posts the data to your controller. 文本字段将数据发布到您的控制器。 (The create or update depending on)
(创建或更新取决于)
In the controller: 在控制器中:
@post = Post.new(params[:post])
or
@post.update_attributes(params[:post])
is where the field is set. 是设置字段的地方。
If you want to implement the setter to add the http:// you should write your function as def url=
. 如果要实现设置器以添加http://,则应将函数编写为
def url=
。
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