Rails - May 2009 - why do we use form_for @story do |f| when there is no loop?

we use

(1..10).each do |i|
  p i
end

so that a value is "yield" to i in a block...

but what about

<% form_for @story do |f| %>
  <%= f.text_field %>
<% end %>

there is no loop at all... why do we need to make it look like a loop?
Can''t we do it without making it look like a loop?  (write in another
way)?

Also, must be use a Story instance here?  Can''t we just use :story and
achieve the same result?  The @story instance is just newly created and
has no data at all -- does it actually help creating the form?  Can''t
:story suffice already?  thanks.
-- 
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On Sun, May 24, 2009 at 11:32 AM, SpringFlowers AutumnMoon
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
> we use
>
> (1..10).each do |i|
>  p i
> end
>
> so that a value is "yield" to i in a block...
>
> but what about
>
> <% form_for @story do |f| %>
>  <%= f.text_field %>
> <% end %>
>
> there is no loop at all... why do we need to make it look like a loop?
> Can''t we do it without making it look like a loop?  (write in
another
> way)?
>
> Also, must be use a Story instance here?  Can''t we just use :story
and
> achieve the same result?  The @story instance is just newly created and
> has no data at all -- does it actually help creating the form?
 Can''t
> :story suffice already?  thanks.
Both these examples of code use blocks, the first just happens to be a
loop, the second only looks like a loop if your first experience of
blocks is in loops.

I think it''s important that you forget about the loop and focus on
blocks, once you''ve understood blocks, it will no longer look like a
loop and you''ll understand that you really don''t want to write
it a
different way (even though it''s possible)

Yes, you can use @story or :story and form_for will figure it out for you.
Mostly it depends on where you''re using the form, new or edit etc.

Andrew Timberlake
http://ramblingsonrails.com

http://MyMvelope.com - The SIMPLE way to manage your savings

Andrew Timberlake wrote:
> On Sun, May 24, 2009 at 11:32 AM, SpringFlowers AutumnMoon
> <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>>
> I think it''s important that you forget about the loop and focus on
> blocks, once you''ve understood blocks, it will no longer look like
a
> loop and you''ll understand that you really don''t want to
write it a
> different way (even though it''s possible)
can i use something like:  (just pseudo code)

with (@story) do |f|
  f.begin_form
  f.textfield :name
  f.end_form
end

so i think the block method will save the begin_form and end_form 
because it automatically add the begin and end before calling the block. 
is that the main benefit?
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SpringFlowers AutumnMoon wrote:
[...]
> can i use something like:  (just pseudo code)
> 
> with (@story) do |f|
>   f.begin_form
>   f.textfield :name
>   f.end_form
> end
You already are.  Just replace "with" with "form_for" and
you''ll see
that the syntax is essentially the same.
> 
> so i think the block method will save the begin_form and end_form 
> because it automatically add the begin and end before calling the block. 
> is that the main benefit?
Oh, now I see what you mean about the syntax.  Yes, that''s sort of it. 
Read more about blocks in Ruby.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
-- 
Posted via http://www.ruby-forum.com/.

Marnen Laibow-Koser wrote:
>> so i think the block method will save the begin_form and end_form 
>> because it automatically add the begin and end before calling the
block.
>> is that the main benefit?
> 
> Oh, now I see what you mean about the syntax.  Yes, that''s sort of
it.
> Read more about blocks in Ruby.
yes, what i meant was something like

    with_model_give_form (@story) do |f|
      f.begin_form
      f.text_field :name
      f.end_form
    end

except the begin_form and end_form can be called within 
"with_model_give_form", so it can become

    with_model_give_form (@story) do |f|
      f.text_field :name
    end

so it is now the same thing as form_for

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