method
field_changed?
field_changed?(attr, old, value)
private
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# File activerecord/lib/active_record/attribute_methods/dirty.rb, line 80 def field_changed?(attr, old, value) if column = column_for_attribute(attr) if column.number? && (changes_from_nil_to_empty_string?(column, old, value) || changes_from_zero_to_string?(old, value)) value = nil else value = column.type_cast(value) end end old != value end