Read action by related struct

Questions & Help Questions
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3

Thanks @barnabasJ that got me on the right track:

    require Ash.Query
    read :by_definition do
      argument :definition, :map

      prepare fn query, _context ->
        definition_id = Ash.Query.get_argument(query, :definition).id
        Ash.Query.filter(query, definition_id == ^definition_id)
      end
    end