Hi there,
I've been following one of the recipes in the Advanced Rails Recipes
books, and have arrived for my own particular needs at this scenario:
I want to cache some options data in constants at loadtime (as per the
recipe) for dropdown menus in a form
All of the different options are in a single table and use STI.
I have the following module in my initializer folder, with
caches_constant called on the main activerecord data class (RnData):
#######
module ConstantCache
module ClassMethods
def caches_constants
const_set(self.name.to_s.underscore.upcase, ['my', 'array',
'here'])
end
end
end
ActiveRecord::Base.send(:extend, ConstantCache::ClassMethods)
########
What happens thus far is that all of the subclasses have a constant
defined with the name of the parent class.
e.g.
RnData::RN_DATA
=> '12345'
RnAuto::RN_DATA
=>'12345'
RnAuto::RN_AUTO
LoadError: Expected /Users/dorian/Sites/mysite/app/models/rn/
rn_auto.rb to define RN_AUTO
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/
active_support/dependencies.rb:428:in `load_missing_constant'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/
active_support/dependencies.rb:77:in
`const_missing_not_from_s3_library'
from /opt/local/lib/ruby/gems/1.8/gems/aws-s3-0.5.1/lib/aws/s3/
extensions.rb:174:in `const_missing'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/
active_support/dependencies.rb:89:in `const_missing'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/
active_support/dependencies.rb:439:in `load_missing_constant'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/
active_support/dependencies.rb:93:in `const_missing'
from (irb):2
Ideally I would like something along the lines of:
RnData::RN_DATA
RnData::RN_AUTO
RnData::RN_INCOME
or just
RnAuto::OPTIONS
RnIncome::OPTIONS
as long as it has the right info for the subclass in it, and not just
the parent inherited across all subclass.
So, I'm wondering if there's a way to write this so that it will run
caches_constant for subclass, or do I have to include the
caches_constants line in all my subclasses?
I've replacing caches_constants with this which seems to work, but I'm
worried I may be overwriting something critical in activerecord:
class RnData < ActiveRecord::Base
def self.inherited(subclass)
subclass.caches_constants
end
end
any help much appreciated!
thanks
dorian
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