Rails - Jan 2007 - Helper versus Partial

hi all,

Im looking for some pointers on best practices of when to use a helper
and when to use a partial.


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first, helpers...

for instance, i need to be able to display a sentence such as

"There are X things in your queue"

where X is an integer

now, depending on the number of things, the grammar will be different.
 if there is only 1 thing, I need it to say "There is 1 thing...",
with 2 or more, it needs to read "There are 2 things..." and with 0
things, "There is nothing..."

now i could put all the code to handle this in my template, but that
would be ugly (and not DRY), or i could but in a helper and just call
the helper when I need to display that sentence correctly

def queue_title(things = 0)
  title = "There "
  case things
    when 0
      title += "is nothing"
    when 1
      title += "is 1 thing"
    else
      title += "are #{things} things"
  end
  title += " in your queue"
  title
end

then in my view template

<%= title_for_queue(@things.size) ->

now a partial is a chunk of your view template that you want to either
reuse or use repeatedly.  candiates for partials are table rows, list
items, forms, etc.

so say i have a form that i want to use a few different views, i would
put it into a partial

_my_form.rhtml

<form ...>
...
</form>

and wherever i want to show this form i can call

<%= render :partial => "my_form" -%>

i suggest you also read the rails docs on helpers and partials.

hope this helps

Chris
On 1/20/07, weepy <jonahfox-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> hi all,
>
> Im looking for some pointers on best practices of when to use a helper
> and when to use a partial.
>
>
> >
>
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My rule of thumb is that if the rhtml is way to full of ERb <% %> tags,
I''ll make a helper instead.

On Jan 20, 6:35 pm, "Chris Hall"
<christopher.k.h...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> first, helpers...
>
> for instance, i need to be able to display a sentence such as
>
> "There are X things in your queue"
>
> where X is an integer
>
> now, depending on the number of things, the grammar will be different.
>  if there is only 1 thing, I need it to say "There is 1
thing...",
> with 2 or more, it needs to read "There are 2 things..." and with
0
> things, "There is nothing..."
>
> now i could put all the code to handle this in my template, but that
> would be ugly (and not DRY), or i could but in a helper and just call
> the helper when I need to display that sentence correctly
>
> def queue_title(things = 0)
>   title = "There "
>   case things
>     when 0
>       title += "is nothing"
>     when 1
>       title += "is 1 thing"
>     else
>       title += "are #{things} things"
>   end
>   title += " in your queue"
>   title
> end
>
> then in my view template
>
> <%= title_for_queue(@things.size) ->
>
> now a partial is a chunk of your view template that you want to either
> reuse or use repeatedly.  candiates for partials are table rows, list
> items, forms, etc.
>
> so say i have a form that i want to use a few different views, i would
> put it into a partial
>
> _my_form.rhtml
>
> <form ...>
> ...
> </form>
>
> and wherever i want to show this form i can call
>
> <%= render :partial => "my_form" -%>
>
> i suggest you also read the rails docs on helpers and partials.
>
> hope this helps
>
> Chris
> On 1/20/07, weepy <jonah...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>
>
> > hi all,
>
> > Im looking for some pointers on best practices of when to use a helper
> > and when to use a partial.

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