[Rails] Select Enumerated Values with FormOptionsHelper

[Jarkko Laine]

Hi Jon,

On 13.2.2005, at 21:12, Jon Bauman wrote:

> Hey,
>
> I'm new, so apologies if I've overlooked obvious resources or violated 
> any etiquette rules for this list.
>
> Since rails does not support the MySQL enum data type, I'm following 
> David's advice of using a varchar and storing the valid values in the 
> application:
> http://one.textdrive.com/pipermail/rails/2005-January/001536.html
>
> So here's my situation. I have a table called "divisions" with a 
> column named "format". It's a varchar, but only the following values 
> are valid: ["open", "womens", "coed"]. Naturally, I want to have an 
> HTML select element on the edit page that contains the valid values, 
> and is set to the current value. It seems like 
> FormOptionsHelper#select should do exactly what I want, so I tried 
> this:
>
> 	<%= select("division", "format", ["open", "womens", "coed"]) %>
>
> But that gets a "raised too few arguments" error. Based on this HOWTO:
> http://wiki.rubyonrails.com/rails/show/HowtoUseFormOptionHelpers
> I tried changing it to this:
>
> 	<%= select("division", "format", { "open" => "open", "womens" => 
> "womens", "coed" => "coed" }) %>

Format is a Ruby kernel method so it's a reserved word you shouldn't be 
using in your app. The error probably means that format gets executed 
with no arguments.

BTW, if you have a list of valid choices (like enum), you should 
probably build that list to your model class so you wouldn't need to 
retype it in every form.

class KlassName < Application...
	def self.ValidFormats
		["open", "womens", "coed"]
	end
end

Then you could use this same list in your validations 
(http://rails.rubyonrails.com/classes/ActiveRecord/Validations.html) 
and your forms: <%= select("objname", "methodname", 
KlassName.ValidFormats) %>



--
Jarkko Laine
http://jlaine.net
http://odesign.fi
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