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James Byrne

2008-May-01 18:58 UTC

link_to meta programming question

I am trying to create a dynamic menu using the following construct:

  <%- menu_list = [ ''first'', ''second'',
''third''] -%>

<ul>
  <%- menu_list.each do |m| -%>
    <%= link_to "List All #{m.titlecase.pluralize} <m>_path %>
  <%- end -%>
</ul>


What I cannot determine is what I have to do to replace <m> so that the
link_to has a target.  I have tried string substitution ("#{m}"_path)
but that gives a compile error:

_erbout.concat(( link_to "List All #{m.titlecase.pluralize}",
("#{m}"_path) ).to_s); _erbout.concat "

I am sure that there must be a fairly straight forward way to do this.
Can someone point it out to me?
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Xavier Noria

2008-May-01 19:06 UTC

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Re: link_to meta programming question

On May 1, 2008, at 20:58 , James Byrne wrote:
>  <%- menu_list = [ ''first'',
''second'', ''third''] -%>
>
> <ul>
>  <%- menu_list.each do |m| -%>
>    <%= link_to "List All #{m.titlecase.pluralize} <m>_path
%>
>  <%- end -%>
> </ul>
>
>
> What I cannot determine is what I have to do to replace <m> so that  
> the
> link_to has a target.
You can get it this way:

    <%= link_to "List All #{m.titlecase.pluralize}",
send("#{m}_path")
%>

Nevertheless in this case I tend to see repetition as a better option.  
Compare the above to this crystal clear

    <%= link_to "List All Firsts", first_path %>
    <%= link_to "List All Seconds", second_path %>
    <%= link_to "List All Thirds", third_path %>

If you have 35 of those then fine, but for a handful of them I find  
copy & paste gives better code.

-- fxn



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James Byrne

2008-May-01 19:30 UTC

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Re: link_to meta programming question

Xavier Noria wrote:> On May 1, 2008, at 20:58 , James Byrne wrote:
> 
>> the
>> link_to has a target.
> 
> You can get it this way:
> 
>     <%= link_to "List All #{m.titlecase.pluralize}",
send("#{m}_path")
> %>
> 
> Nevertheless in this case I tend to see repetition as a better option.
> Compare the above to this crystal clear
> 
>     <%= link_to "List All Firsts", first_path %>
>     <%= link_to "List All Seconds", second_path %>
>     <%= link_to "List All Thirds", third_path %>
> 
> If you have 35 of those then fine, but for a handful of them I find
> copy & paste gives better code.
> 
> -- fxn
Thank you.

My example was cut down to the essentials to avoid clutter and focus on 
the my present issue.  There are many related bits to each ''m''
that have
a similar construction so that meta programming this represents a clear 
advantage over cut and paste.


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James Byrne

2008-May-01 19:53 UTC

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Re: link_to meta programming question

Now I have a related question.  Some of these methods may or may not 
have routes depending upon when and where they are invoked. So, I have a 
guard conditional set up:

<%- role_list.each do |m| -%>
  <li>  <%= "#{m.titlecase}" %>

  <%= if defined? "#{m.pluralize}_path" then
          link_to "List All #{m.titlecase.pluralize}",
               send("#{m.pluralize}_path")
        else
          nil
        end %>
    </li>
  <%- end -%>


When the guard is explicit ( if defined? firsts_path then ...) this 
works. But I do not know how to test for a dynamically formed method 
name.  How is this done in Ruby?
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Xavier Noria

2008-May-01 20:23 UTC

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Re: link_to meta programming question

2008/5/1 James Byrne
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>:
>  Now I have a related question.  Some of these methods may or may not
>  have routes depending upon when and where they are invoked. So, I have a
>  guard conditional set up:
>
>  <%- role_list.each do |m| -%>
>   <li>  <%= "#{m.titlecase}" %>
>
>   <%= if defined? "#{m.pluralize}_path" then
>  When the guard is explicit ( if defined? firsts_path then ...) this
>  works. But I do not know how to test for a dynamically formed method
>  name.  How is this done in Ruby?
Yeah, defined? is not what you want in that case:

  irb(main):001:0> defined? "foo"
  => "expression"

Use respond_to? instead.

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James Byrne

2008-May-01 21:54 UTC

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Re: link_to meta programming question

Xavier Noria wrote:> 2008/5/1 James Byrne
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>:
> Yeah, defined? is not what you want in that case:
> 
>   irb(main):001:0> defined? "foo"
>   => "expression"
> 
> Use respond_to? instead.

Works great using either idiom:  Thanks!

<ul>
  <%- role_list.each do |m| -%>
    <li>  <%= "#{m.titlecase}" %>
  <! guard against missing path method this way -->
    <%= link_to "List All #{m.titlecase.pluralize}",
          send("#{m.pluralize}_path") \
          if respond_to? "#{m.pluralize}_path" %>
  <!-- or this way -->
    <%= if respond_to? "#{m.pluralize}_path" then
          link_to "List All #{m.titlecase.pluralize}",
            send("#{m.pluralize}_path")
        else
          nil
        end %>
    </li>
  <%- end -%>
</ul>

Can you explain to me the different behaviours between defined? and 
respond_to? in this instance.  I am not clear why defined? would work 
with symbolized path names but not work with the same parameterized 
string.to_sym.

Thanks again.

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Xavier Noria

2008-May-01 22:24 UTC

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Re: link_to meta programming question

On Thu, May 1, 2008 at 11:54 PM, James Byrne
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>  Can you explain to me the different behaviours between defined? and
>  respond_to? in this instance.  I am not clear why defined? would work
>  with symbolized path names but not work with the same parameterized
>  string.to_sym.
respond_to? asks whether the object responds to some method. Since you
want to know whether self responds to the path generator that''s the
one.

defined? is more generic. That''s a special operator in the sense that
Ruby does *not* evaluate its argument. I don''t know the whole story
(anyone?) but a posteriori defined? works at parse time or something
like that to interpret the argument expression in a special way.

For example, if SOME_CONSTANT is unknown

   defined? SOME_CONSTANT

does *not* raise NameError, it does not evaluate the argument. It
silently returns nil. If the constant was known it would return
"constant".

Check this other one for example:

   irb(main):004:0> a = "\n"
   => "\n"
   irb(main):005:0> defined? a.chop!
   => "method"
   irb(main):006:0> a
   => "\n"

You see? chop! is not being called, we are just told that a responds to chop!.

I''d like to provide a better explanation of defined? but don''t
have
Flanagan & Matz at hand.

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Frederick Cheung

2008-May-01 23:21 UTC

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Re: link_to meta programming question

On 1 May 2008, at 23:24, Xavier Noria wrote:
>
> On Thu, May 1, 2008 at 11:54 PM, James Byrne
> <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>
>> Can you explain to me the different behaviours between defined? and
>> respond_to? in this instance.  I am not clear why defined? would work
>> with symbolized path names but not work with the same parameterized
>> string.to_sym.
>
> respond_to? asks whether the object responds to some method. Since you
> want to know whether self responds to the path generator that''s
the
> one.
>
> defined? is more generic. That''s a special operator in the sense
that
> Ruby does *not* evaluate its argument. I don''t know the whole
story
> (anyone?) but a posteriori defined? works at parse time or something
> like that to interpret the argument expression in a special way.
>
defined? is a bit nuts:
http://redhanded.hobix.com/inspect/methodCheckDefined.html


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James Byrne

2008-May-01 23:26 UTC

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Re: link_to meta programming question

Xavier Noria wrote:
> 
> I''d like to provide a better explanation of defined? but
don''t have
> Flanagan & Matz at hand.
The main point that I see here is that when I am testing for the 
existence of methods then I should use respond_to? and that is 
sufficient.
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James Byrne

2008-May-02 00:08 UTC

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Re: link_to meta programming question

For more on defined? see:

http://redhanded.hobix.com/inspect/methodCheckDefined.html
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James Byrne

2008-May-02 16:40 UTC

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Re: link_to meta programming question

I wrote too soon.  I have another blank spot in my knowledge that need 
filling.

This construct works:

<ul>
  <%- role_list.each do |m| -%>
    <li>
      <%= "#{m.titlecase}" if respond_to?
"#{m.pluralize}_path" %>
      <%= link_to "List All #{m.titlecase.pluralize}", \
            send("#{m.pluralize}_path") if respond_to? 
"#{m.pluralize}_path" %>
      <%= link_to "Add New #{m.titlecase}",
send("new_#{m}_path") \
            if respond_to? "#{m.pluralize}_path" %>
    </li>
  <%- end -%>
</ul>

and this does not:

<ul>
<%- role_list.each do |m| -%>
  <li>
  <!-- guard against missing path methods. We assume (that word again)
       that if the ms_path exists then the new_m_path does as well.-->
<%= if respond_to? "#{m.pluralize}_path" then
      "#{m.titlecase}"
      link_to "List All #{m.titlecase.pluralize}", 
send("#{m.pluralize}_path")
      link_to "Add New #{m.titlecase}",
send("new_#{m}_path")
    end -%>
  </li>

<%- end -%>
</ul>

All I get in the html from this is the output of the last step in the if 
block:

 link_to "Add New #{m.titlecase}", send("new_#{m}_path")

This indicate that I am only getting the final return value of a Ruby 
method as the entire result of the if construct.  This is not what I 
intend or desire so is there some way of getting each step in the if 
block to produce output onto the html page?



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Xavier Noria

2008-May-02 16:58 UTC

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Re: link_to meta programming question

On Fri, May 2, 2008 at 6:40 PM, James Byrne
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>  <ul>
>  <%- role_list.each do |m| -%>
>   <li>
>   <!-- guard against missing path methods. We assume (that word again)
>        that if the ms_path exists then the new_m_path does as well.-->
>
> <%= if respond_to? "#{m.pluralize}_path" then
>       "#{m.titlecase}"
>
>       link_to "List All #{m.titlecase.pluralize}",
>  send("#{m.pluralize}_path")
>       link_to "Add New #{m.titlecase}",
send("new_#{m}_path")
>     end -%>
>   </li>
>
>  <%- end -%>
>  </ul>
>
>  All I get in the html from this is the output of the last step in the if
>  block:
>
>   link_to "Add New #{m.titlecase}",
send("new_#{m}_path")
>
>  This indicate that I am only getting the final return value of a Ruby
>  method as the entire result of the if construct.  This is not what I
>  intend or desire so is there some way of getting each step in the if
>  block to produce output onto the html page?
if is an expression in Ruby, but the easy way to do that in ERb is

  <% if ... %>
    this
    that
   <%= link_to ... %>
  <% end %>

Note the use of <% ... %> instead of <%= ... %>.

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James Byrne

2008-May-02 18:22 UTC

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Re: link_to meta programming question

Xavier Noria wrote:
> if is an expression in Ruby, but the easy way to do that in ERb is
> 
>   <% if ... %>
>     this
>     that
>    <%= link_to ... %>
>   <% end %>
> 
> Note the use of <% ... %> instead of <%= ... %>.
I tried that syntax first and could not get it to work. I have since 
discovered why.  I kept leaving the trailing -%> off of the "if" 
statement.  Sigh.

Thanks again.
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James Byrne

2008-May-02 19:04 UTC

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Re: link_to meta programming question

Me again.

Now that I have this working in a view I want to move it all out into a 
pair of methods that I can call from multiple views: role_list_head and 
role_list_foot.  Two questions arise from this:

Where do I put these methods? In application_helper.rb, 
application_controller.rb, or somewhere else?

What does the method look like?  Something akin to this I expect:

@role_list_default = [''entity'', ''client'',
''employee'', ''vendor'']

def role_list_head(list=@role_list_default)
  link_to ''Main Page'', :controller =>
''nav_menus''
  list.each do |m|
    # guard against missing path methods.
    if respond_to? "#{m.pluralize}_path" then
      link_to "List All #{m.titlecase.pluralize}", 
send("#{m.pluralize}_path")
    end
  end
  list.each do |m|
    if respond_to? "new_#{m.}_path" then
      link_to "Add New #{m.titlecase}",
send("new_#{m}_path")
    end
  end
end

I know that this does not work, because I tried it.  But something 
somewhat like this has to be the answer.
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Xavier Noria

2008-May-02 19:39 UTC

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Re: link_to meta programming question

On Fri, May 2, 2008 at 9:04 PM, James Byrne
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>  What does the method look like?  Something akin to this I expect:
>
>  @role_list_default = [''entity'',
''client'', ''employee'',
''vendor'']
This could be a constant.
>  def role_list_head(list=@role_list_default)
>   link_to ''Main Page'', :controller =>
''nav_menus''
>   list.each do |m|
>
>     # guard against missing path methods.
>
>     if respond_to? "#{m.pluralize}_path" then
>
>       link_to "List All #{m.titlecase.pluralize}",
>  send("#{m.pluralize}_path")
>     end
>   end
>   list.each do |m|
>     if respond_to? "new_#{m.}_path" then
>
>       link_to "Add New #{m.titlecase}",
send("new_#{m}_path")
>     end
>   end
>  end
>
>  I know that this does not work, because I tried it.  But something
>  somewhat like this has to be the answer.
That''s view stuff so should go to a helper or to a partial. The helper
would build and return a single string with HTML so that you can use
it like this

   <%= role_list_header %>

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James Byrne

2008-May-02 21:06 UTC

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Re: link_to meta programming question

Xavier Noria wrote:
> That''s view stuff so should go to a helper or to a partial. The
helper
> would build and return a single string with HTML so that you can use
> it like this
> 
>    <%= role_list_header %>
yes, but which helper file exactly? All that I have read about helpers 
indicates that they are tied to a specific controller by name. I tried 
adding a dummy method to a file called lib/application_helper.rb but 
when I called the method from a view I got a missing method error.
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Xavier Noria

2008-May-02 21:14 UTC

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Re: link_to meta programming question

On Fri, May 2, 2008 at 11:06 PM, James Byrne
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>  > That''s view stuff so should go to a helper or to a partial.
The helper
>  > would build and return a single string with HTML so that you can use
>  > it like this
>  >
>  >    <%= role_list_header %>
>
>  yes, but which helper file exactly? All that I have read about helpers
>  indicates that they are tied to a specific controller by name. I tried
>  adding a dummy method to a file called lib/application_helper.rb but
>  when I called the method from a view I got a missing method error.
There are several options, but you can just throw it into
app/helpers/application_helper.rb. That file contains helpers that are
available everywhere.

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James Byrne

2008-May-02 21:17 UTC

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Re: link_to meta programming question

James Byrne wrote:

I figured out what I was doing wrong in application_helper.rb. It really 
helps if you put:

module ApplicationHelper
  ...
end

around your code. double sigh.
-- 
Posted via http://www.ruby-forum.com/.

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Xavier Noria

2008-May-02 21:28 UTC

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Re: link_to meta programming question

On Fri, May 2, 2008 at 11:17 PM, James Byrne
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>  James Byrne wrote:
>
>  I figured out what I was doing wrong in application_helper.rb. It really
>  helps if you put:
>
>  module ApplicationHelper
>   ...
>  end
>
>  around your code. double sigh.
Careful, you don''t need that file in lib, see the path in my previous
post.

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James Byrne

2008-May-02 22:05 UTC

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Re: link_to meta programming question

Xavier Noria wrote:
> 
> Careful, you don''t need that file in lib, see the path in my
previous
> post.
What are the implications of each.  Why one place rather than the other?
-- 
Posted via http://www.ruby-forum.com/.

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Xavier Noria

2008-May-02 22:10 UTC

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Re: link_to meta programming question

On Sat, May 3, 2008 at 12:05 AM, James Byrne
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>
>  Xavier Noria wrote:
>
>  >
>  > Careful, you don''t need that file in lib, see the path in my
previous
>  > post.
>
>  What are the implications of each.  Why one place rather than the other?
Because app/helpers is the directory where helpers are expected to be
by convention. Note that application_helper.rb is generated there by
the rails command, and it already contains a module ApplicationHelper.

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