Validates Constancy
Location: United States, Houston, Texas
This RubyGem and Rails plugin adds a ‘validates_constancy_of’ validation to Active Record. It allows you to prevent particular database fields from being changed after a record is created. A validation error occurs on updates if an attribute of a model object is different from its value in the database.
The code is packaged as both a RubyGem and a Rails plugin. You can use either one, depending on what your needs are.
Homepage: http://constancy.rubyforge.org/
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