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Description: Rails Plugin - specify attributes within a model that can be set but not modified
Homepage: http://6brand.com
Clone URL: git://github.com/JackDanger/immutable_attributes.git
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allowing nils to be overwritten
Jack Danger Canty (author)
Tue Apr 29 09:30:24 -0700 2008
commit  e7686e142eafadd3fb42c9d4e0a08bbec1474e6f
tree    311dff8e7f35a411fed49bfb5f7a84065ae1e825
parent  611798732ebd560ac6c759976e9eff00dee4f168
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lib/immutable_attributes.rb 
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@@ -10,7 +10,9 @@ module ImmutableAttributes
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     args.each do |meth|
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       class_eval do
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         define_method("#{meth}=") do |value|
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-          new_record? ? write_attribute(meth, value) : raise(ActiveRecord::ImmutableAttributeError, "#{meth} is immutable!")
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+          new_record? || read_attribute(meth).nil? ?
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+            write_attribute(meth, value) :
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+            raise(ActiveRecord::ImmutableAttributeError, "#{meth} is immutable!")
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         end
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       end
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     end

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