4 replies

:datetime with constraints vs :utc_datetime_usec

Hey all, I’m looking at the docs for the different datetime options and they mention

>A wrapper around :datetime for backwards compatibility

https://hexdocs.pm/ash/Ash.Type.UtcDatetimeUsec.html

In a new project with the latest version of Ash what is the most appropriate way to define a timestamp with microsecond precision?

Should I prefer:

attribute :xx, :datetime do
  constraints precision: microsecond
end

attribute :xx, :datetime do
  constraints precision: microsecond
end

attribute :xx, :datetime do
  constraints precision: microsecond
end

attribute :xx, :datetime do
  constraints precision: microsecond
end

attribute :xx, :utc_datetime_usec

attribute :xx, :utc_datetime_usec

attribute :xx, :utc_datetime_usec

attribute :xx, :utc_datetime_usec

I don’t quite understand what the implication of the “warning” about backward compatibility is :/

Solution

They are equivalent and will likely not change anytime soon. Someday we may warn when you use

:utc_datetime_usec

:utc_datetime_usec

:utc_datetime_usec

:utc_datetime_usec over the constraint.

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:datetime with constraints vs :utc_datetime_usec

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