Rails - Jan 2007 - Storage of constants

Hello,

For a number of my models I have many constant key value pairs
(sometimes dozens).  I have considered putting them in the model but it
ends up creating a very cluttered model file.  Is there an approvaed
approach to having an external data file that is associated with a
model?  Should I use a yaml file of the same name? xml?  csv?
Recommendations are appreciated.

Thanks,
Ryan Glover
http://www.prioninteractive.com

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Hi --

On Sun, 14 Jan 2007, Ryan Glover wrote:
>
> Hello,
>
> For a number of my models I have many constant key value pairs
> (sometimes dozens).  I have considered putting them in the model but it
> ends up creating a very cluttered model file.  Is there an approvaed
> approach to having an external data file that is associated with a
> model?  Should I use a yaml file of the same name? xml?  csv?
> Recommendations are appreciated.
How about Ruby? :-)  Just define some constants and pull them in at
runtime.  You can put things in lib/ and then require them from your
model file(s), or from the bottom of environment.rb.  For example, you
could create a file called extra_data.rb:

   module ExtraData
     COLORS = %w{ red orange yellow }
   end

Then in your model file:

   require ''extra_data''
   # now you have access to ExtraData::COLORS.


David

-- 
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    (See what readers are saying!  http://www.rubypal.com/r4rrevs.pdf)
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Ryan Glover wrote:
> Hello,
> 
> For a number of my models I have many constant key value pairs
> (sometimes dozens).  I have considered putting them in the model but it
> ends up creating a very cluttered model file.  Is there an approvaed
> approach to having an external data file that is associated with a
> model?  Should I use a yaml file of the same name? xml?  csv?
> Recommendations are appreciated.
> 
> Thanks,
> Ryan Glover
> http://www.prioninteractive.com
You could have a subfolder of app/models called constants.

#app/models/foo.rb
require ''constants/foo''
class Foo < AR::B
  include FooConstants
  self.bar = BAZ
end

#app/models/constants/foo.rb
module FooConstants
  BAZ = "Foobar!"
end

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