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Don't enable validations when passing false hash values to ActiveMode…
…l.validates Passing a falsey option value for a validator currently causes that validator to be enabled, just like "true": ActiveModel.validates :foo, :presence => false This is rather counterintuitive, and makes it inconvenient to wrap `validates` in methods which may conditionally enable different validators. As an example, one is currently forced to write: def has_slug(source_field, options={:unique => true}) slugger = Proc.new { |r| r[:slug] = self.class.sluggify(r[source_field]) if r[:slug].blank? } before_validation slugger validations = { :presence => true, :slug => true } if options[:unique] validations[:uniqueness] = true end validates :slug, validations end because the following reasonable-looking alternative fails to work as expected: def has_slug(source_field, options={:unique => true}) slugger = Proc.new { |r| r[:slug] = self.class.sluggify(r[source_field]) if r[:slug].blank? } before_validation slugger validates :slug, :presence => true, :slug => true, :uniqueness => options[:unique] end (This commit includes a test, and all activemodel and activerecord tests pass as before.)
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