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module DefaultValues | |
def has_default_values(default_values = {}) | |
class_attribute :default_values | |
self.default_values = default_values | |
after_initialize :assign_default_values | |
include InstanceMethods | |
end | |
module InstanceMethods | |
private | |
def assign_default_values | |
return unless new_record? | |
default_values.each do |key, value| | |
self[key] = value if self[key].nil? | |
end | |
end | |
end | |
end |
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# In config/initializers | |
ActiveRecord::Base.extend DefaultValues |
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# Example usage | |
class SomeModel < ActiveRecord::Base | |
has_default_values( | |
title: "Default", | |
flag_yn: false | |
) | |
.. | |
end |
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