Rails - Sep 2006 - Overwriting ActiveRecord::Base.content_columns

Hi guys,

I want to define my own Content_colums methode as part of the 
ActiveRecord::Base class.

To do so, I have added the following code:

[Environment.rb]
require ''model_extensions''
ActiveRecord::Base.send(:extend, ModelExtensions)

[model_extensions.rb]
module ModelExtensions
  #Define Mixins for the ActiveRecord::Base modelclass
  # Define list of available items for select
  def valid_items(current_item=nil)
    #.... works fine
  end

  # Overwrite displayble columns attribute, eliminate: created_* and 
updated_*
  def content_columns
    @content_columns ||= columns.reject { |c| c.primary || c.name =~ 
/(_id|_count)$/ || c.name == inheritance_column || c.name == 
locking_column || c.name =~ /(created_|updated_)/}
  end
end


However, this won''t work for the content_columns! The valid_items
method
though works perfectly as it is added to the AR:Base class.
But overwriting content_columns has no effect at all.
I tried to put ''attr :content_columns, true'' but no effect
neither


Any clues?

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Jan wrote:
> I want to define my own Content_colums methode as part of the 
> ActiveRecord::Base class.
> 
> To do so, I have added the following code:
> 
> [Environment.rb]
> require ''model_extensions''
> ActiveRecord::Base.send(:extend, ModelExtensions)
> 
> [model_extensions.rb]
> module ModelExtensions
>   #Define Mixins for the ActiveRecord::Base modelclass
>   # Define list of available items for select
>   def valid_items(current_item=nil)
>     #.... works fine
>   end
> 
>   # Overwrite displayble columns attribute, eliminate: created_* and 
> updated_*
>   def content_columns
>     @content_columns ||= columns.reject { |c| c.primary || c.name =~ 
> /(_id|_count)$/ || c.name == inheritance_column || c.name == 
> locking_column || c.name =~ /(created_|updated_)/}
>   end
> end
> 
> 
> However, this won''t work for the content_columns! The valid_items
method
> though works perfectly as it is added to the AR:Base class.
> But overwriting content_columns has no effect at all.
> I tried to put ''attr :content_columns, true'' but no
effect neither
extend will only add methods, not re-define existing ones.

Instead, just write model_extensions.rb as

class ActiveRecord::Base
   def self.valid_items(current_item=nil)
     ...
   end

   def self.content_columns
     ...
   end
end

and require this in environment.rb

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