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. Post has an attribute called url, and the following getter is defined:
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 (e.g. it returns http://foo.com if the attribute's true value is 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; rather, it simply returns foo.com
How does form_for access a开发者_如何学运维ttributes on ActiveRecord models? It seems to bypass any overloaded getters.
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?
The text field posts the data to your controller. (The create or update depending on)
In the controller:
@post = Post.new(params[:post])
or
@post.update_attributes(params[:post])
is where the field is set.
If you want to implement the setter to add the http:// you should write your function as def url=
.
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