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adding comments to update_attribute method

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1 parent f3409dc commit c9fe3c3bd0ee5010a36a157fe850ef6e8ffb147d @neerajdotname neerajdotname committed
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  1. +4 −0 activerecord/lib/active_record/persistence.rb
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4 activerecord/lib/active_record/persistence.rb
@@ -110,6 +110,10 @@ def becomes(klass)
# * updated_at/updated_on column is updated if that column is available
# * does not work on associations
# * does not work on attr_accessor attributes. The attribute that is being updated must be column name.
+ # * does not work on new record. <tt>record.new_record?</tt> should return false for this method to work.
+ # * updates only the attribute that is input to the method. If there are other changed attributes then
+ # those attributes are left alone. In that case even after this method has done its work <tt>record.changed?</tt>
+ # will return true.
#
def update_attribute(name, value)
raise ActiveRecordError, "#{name.to_s} is marked as readonly" if self.class.readonly_attributes.include? name.to_s

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