Ash.Changeset.for_update

You're seeing just the function for_update, go back to Ash.Changeset module for more information.

for_update(initial, action, params \\ %{}, opts \\ [])

Constructs a changeset for a given update action, and validates it.

Anything that is modified prior to for_update/4 is validated against the rules of the action, while anything after it is not.

See for_create/4 for more information