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Active Record Attribute Methods Write

Methods
W

Instance Public methods

write_attribute(attr_name, value)

Updates the attribute identified by attr_name using the specified value. The attribute value will be type cast upon being read.

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/write.rb, line 31
def write_attribute(attr_name, value)
  name = attr_name.to_s
  name = self.class.attribute_aliases[name] || name

  name = @primary_key if name == "id" && @primary_key
  @attributes.write_from_user(name, value)
end