From: Stefano Crocco <stefano.crocco@...>
Date: 2008-10-16T20:47:25+09:00
Subject: Re: A Ruby block question

Alle Thursday 16 October 2008, David Trasbo ha scritto:
> Stefano Crocco wrote:
> >> In other words I need to put user-defined input in between some
> >> pre-defined content. How can I approach that?
> >
> > If I understand correctly what you want to do, you don't need to do
> > anything
> > special:
> >
> > def my_method
> >   puts "predefined text 1"
> >   puts yield
> >   puts "predefined text 2"
> > end
>
> My method looks like this:
>
> def fields_for_setting(namespace, name, &block)
>   namespace = namespace.to_s
>   name = name.to_s
>   id = "settings_#{namespace}_#{name}_"
>   m = Builder::XmlMarkup.new :indent => 2
>   fields_for "settings[]", setting =
> Setting.find_or_initialize_by_namespace_and_name(namespace, name) do |f|
>     m.p do
>       unless setting.new_record?
>         m << (f.hidden_field :id, :index => nil, :id => id+"id")
>       end
>       m << (f.hidden_field :namespace, :index => nil, :id =>
> id+"namespace")
>       m << (f.hidden_field :name, :index => nil, :id => id+"name")
>       #puts yield f???
>     end
>   end
> end
>
> The problem is, I'm using Builder::XmlMarkup and the fields_for from
> Rails. I want to put some hidden fields AND the text fields defined by
> the block into a <p> tag. That means I need to be able to access the f
> object provided by fields_for and use it in this method's block.
>
> But how?

I don't know Rails and Builder::XmlMarkup, so I can be completely wrong. From 
a quick look at Builder::XmlMarkup api, I'd say that, if the block returns the 
string you want to insert in the p element, you only have to insert it in m 
like you did for the texts:

m << yield f

Stefano