On 8 April 2011 05:18, Ad Ber
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> HI ALL, i am new to rails and having a hard time understanding some
> things..
>
> I have a Model called person and have this code fragment in my VIew
> 1 <%= form_for :person do |f| %>
> 2 First name: <%= f.text_field :first_name %><br />
> 3 <% end %>
>
> does anybody know what :first_name means or what it does in line 2? In
> my person model i have a first_name field.. Is that an object or the
> field itself im calling or what?
The call:
f.text_field :first_name
does two things with the ''first_name'' parameter.
First, it uses it to set the name of the form element:
<input name="person[first_name]"...
When the form is submitted, this comes in as a parameter like this:
:person => {:first_name => ''Bob''}
which you can use to easily create or update the person record.
Second, it can use the parameter to look up the existing value of the
person''s first_name (if it has one), and display that as the default
value in the form (i.e. if this was an update form, rather than a
create form). For instance, if you started with a @person object that
had the first_name of ''Chad'', then you could get the following
tag:
<input type="text" name="person[first_name]"
value="Chad">
Chris
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