One option would be to put it in the controller. You can simply check the
dates and create an instance variable containing an error message. That
isn't very DRY though. Want to do it somewhere else? Then you're duplicating
the code.
Another option is to create a dummy model that does not inherit from
ActiveRecord, then include the validations there. If you add the right
methods, you can interact with it just like a normal AR model. Something
like this should get you started:
class MySearchClass
include ActiveModel::Validations
validates :start_date
validates :end_date
def save
return false unless valid?
# the dates were valid, go ahead and query the records
return true
end
end
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