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matt

2006-Dec-26 10:07 UTC

Excluding column names from a listing

I have a Listing model that I know I don''t want to display a few of the
columns, but I don''t want to hard-code the columns that I do want
either.

Is there a way to exclude certain columns?

This is what I have:
<% for column in Listing.content_columns %>
    <th><%= column.human_name %></th>


This is roughly what I want (in midnight pseudo-code):
<% for column in Listing.content_columns[exclude: column_1, column_2] %>
    <th><%= column.human_name %></th>

do-able? 

Matt



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Russell Norris

2006-Dec-26 12:29 UTC

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Re: Excluding column names from a listing

Why not just customize your code instead of relying on the scaffolding?

RSL

On 12/26/06, matt <matt-SaPSgiKzPPtdsTMtEp03Dg@public.gmane.org>
wrote:>
>
>
> I have a Listing model that I know I don''t want to display a few
of the
> columns, but I don''t want to hard-code the columns that I do want
> either.
>
> Is there a way to exclude certain columns?
>
> This is what I have:
> <% for column in Listing.content_columns %>
>     <th><%= column.human_name %></th>
>
>
> This is roughly what I want (in midnight pseudo-code):
> <% for column in Listing.content_columns[exclude: column_1, column_2]
%>
>     <th><%= column.human_name %></th>
>
> do-able?
>
> Matt
>
>
>
> >
>
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Jason Norris

2006-Dec-26 14:15 UTC

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Re: Excluding column names from a listing

Usually, it is better to make your own view instead of using the scaffold, but
sometimes it''s easier just to use the scaffolding.

What I did was override the content_columns method. Just take the source:

def content_columns
    @content_columns ||= columns.reject { |c| c.primary || c.name =~
/(_id|_count)$/ || c.name == inheritance_column }
end

And add the column names you want to exclude in the regex with _id and 
_count.

Jason


matt wrote:>
>
> I have a Listing model that I know I don''t want to display a few
of the
> columns, but I don''t want to hard-code the columns that I do want
> either.
>
> Is there a way to exclude certain columns?
>
> This is what I have:
> <% for column in Listing.content_columns %>
>    <th><%= column.human_name %></th>
>
>
> This is roughly what I want (in midnight pseudo-code):
> <% for column in Listing.content_columns[exclude: column_1, column_2]
%>
>    <th><%= column.human_name %></th>
>
> do-able?
> Matt
>
>
>
> >
>

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dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org

2006-Dec-26 14:16 UTC

head link

Re: Excluding column names from a listing

Hi --

On Tue, 26 Dec 2006, matt wrote:
>
>
> I have a Listing model that I know I don''t want to display a few
of the
> columns, but I don''t want to hard-code the columns that I do want
> either.
>
> Is there a way to exclude certain columns?
>
> This is what I have:
> <% for column in Listing.content_columns %>
>   <th><%= column.human_name %></th>
>
>
> This is roughly what I want (in midnight pseudo-code):
> <% for column in Listing.content_columns[exclude: column_1, column_2]
%>
>   <th><%= column.human_name %></th>
>
> do-able?
Absolutely!

I''d say what''s missing is a content_columns_names method (at
least I
can''t find one).  It would look something like this:

   class ActiveRecord::Base
     def self.content_column_human_names
       content_columns.map {|c| c.human_name }
     end
   end

You could put that into a plugin, or just roll it into your
application code (as below).  In either case, it''s probably best to
put the array operation in the controller, which is a better place for
dynamic determination of names you don''t want.

So the whole thing might look like this (untested, and partially
pseudo-code):

In the controller:

   def my_action
     excludes = figure_out_which_names_you_don''t_want
     all_names = Listing.content_columns.map {|c| c.human_name }
     @header_names = all_names - excludes
   end

And in the view:

   <% @header_names.each do |name| %>
     <th><%= name %></th>
   <% end %>


David

-- 
Q. What is THE Ruby book for Rails developers?
A. RUBY FOR RAILS by David A. Black (http://www.manning.com/black)
    (See what readers are saying!  http://www.rubypal.com/r4rrevs.pdf)
Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
A. Ruby Power and Light, LLC (http://www.rubypal.com)

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matt

2006-Dec-26 16:18 UTC

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Re: Excluding column names from a listing

Thanks,

That''s the hint I''ve needed. Hadn''t even thought
about writing my own
method.

I''ve read in numerous books/articles *not* to put the code in the
view..... and look what I was trying to do.


Thanks again. 



On Tue, 2006-12-26 at 09:16 -0500,
dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org wrote:> Hi --
> 
> On Tue, 26 Dec 2006, matt wrote:
> 
> >
> >
> > I have a Listing model that I know I don''t want to display a
few of the
> > columns, but I don''t want to hard-code the columns that I do
want
> > either.
> >
> > Is there a way to exclude certain columns?
> >
> > This is what I have:
> > <% for column in Listing.content_columns %>
> >   <th><%= column.human_name %></th>
> >
> >
> > This is roughly what I want (in midnight pseudo-code):
> > <% for column in Listing.content_columns[exclude: column_1,
column_2] %>
> >   <th><%= column.human_name %></th>
> >
> > do-able?
> 
> Absolutely!
> 
> I''d say what''s missing is a content_columns_names method
(at least I
> can''t find one).  It would look something like this:
> 
>    class ActiveRecord::Base
>      def self.content_column_human_names
>        content_columns.map {|c| c.human_name }
>      end
>    end
> 
> You could put that into a plugin, or just roll it into your
> application code (as below).  In either case, it''s probably best
to
> put the array operation in the controller, which is a better place for
> dynamic determination of names you don''t want.
> 
> So the whole thing might look like this (untested, and partially
> pseudo-code):
> 
> In the controller:
> 
>    def my_action
>      excludes = figure_out_which_names_you_don''t_want
>      all_names = Listing.content_columns.map {|c| c.human_name }
>      @header_names = all_names - excludes
>    end
> 
> And in the view:
> 
>    <% @header_names.each do |name| %>
>      <th><%= name %></th>
>    <% end %>
> 
> 
> David
> 

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Rails - Dec 2006 - Excluding column names from a listing

Excluding column names from a listing

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