Declares a non-writable attribute with a create and update default of &DateTime.utc_now/0

Examples

update_timestamp :inserted_at

Arguments

• :name - The name of the attribute.

Options

• :type - false The type of the attribute. The default value is :utc_datetime.

• :constraints - Constraints to provide to the type when casting the value. See the type's documentation for more information.

• :primary_key? - Whether or not the attribute is part of the primary key (one or more fields that uniquely identify a resource) The default value is false.

• :allow_nil? - Whether or not the attribute can be set to nil The default value is true.

• :generated? - Whether or not the value may be generated by the data layer The default value is false.

• :writable? - false Whether or not the value can be written to The default value is false.

• :update_default - false A zero argument function, an {mod, fun, args} triple or {:constant, value}. If no value is provided for the attribute on update, this value is used. The default value is &DateTime.utc_now/0.

• :default - false A zero argument function, an {mod, fun, args} triple or {:constant, value}. If no value is provided for the attribute on create, this value is used. The default value is &DateTime.utc_now/0.