From: "David A. Black" <dblack@...>
Date: 2008-10-16T21:46:31+09:00
Subject: Re: A Ruby block question

On Thu, 16 Oct 2008, David Trasbo wrote:

> David A. Black wrote:
>> Hi --
>>
>> On Thu, 16 Oct 2008, David Trasbo wrote:
>>
>>> can't convert nil into String
>>>
>>> That doesn't really make sence, does it?
>>
>> Actually it does, because your block contains a call to puts, and puts
>> always returns nil. You probably want your block just to contain a
>> string.
>
> Ah, I see. Let me just explain. Since I'm using Rails I am calling this
> method with the block in a view or a template. My template language is
> Haml, and this is how it's called:
>
> - fields_for_setting("site", "name") do |f|
>  = f.label :value, "Site name", :index => nil
>  = f.text_field :value, :index => nil
>
> The = is a short hand for puts as you pointed out. But I don't see other
> possibilities than using put, otherwise the text field will not show up
> in the view.
>
> How can I both use puts and make some content appear around the text
> field?

I'm not a HAML expert, but in general, you don't want to use puts for
anything you're outputting in a template. You just want to insert
strings. I'm not sure how HAML handles string concatenation of this
kind.


David

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