(2.3.5) removing validations

(sorry for misposting this to rubyonrails-core earlier)

Today I tried to remove (actually overwrite) a validation from a model, from within a plugin.

This was the original validation:   validates_length_of :login, :maximum => 30

This was the only code I could come up with to replace it:

  def self.included(base)     base.class_eval do       @validate_callbacks.delete_if { |callback|         begin           (callback.method.respond_to?(:binding)) &&             (eval("attrs", callback.method.binding).first == :login) &&             (callback.options[:maximum] == 30)         rescue NameError           false         end       }

    validates_length_of(:login, :maximum => 75)   end

Now in this case I could also have changed the options[:maximum] on the callback, but either way - is there a cleaner way?

  -- niklas