Ash.Api.read_one

You're seeing just the callback read_one, go back to Ash.Api module for more information.

Specs

read_one(Ash.Query.t() | Ash.Resource.t(), params :: Keyword.t()) ::
  {:ok, Ash.Resource.record()}
  | {:ok, Ash.Resource.record(), Ash.Query.t()}
  | {:error, term()}

Run a query on a resource, but fail on more than one result

This is useful if you have a query that doesn't include a primary key but you know that it will only ever return a single result