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40 lines
1.3 KiB
Elixir
40 lines
1.3 KiB
Elixir
defmodule AshPostgres.Transformers.PreventMultidimensionalArrayAggregates do
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@moduledoc false
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use Spark.Dsl.Transformer
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alias Spark.Dsl.Transformer
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def after_compile?, do: true
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def transform(dsl) do
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resource = Transformer.get_persisted(dsl, :module)
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dsl
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|> Ash.Resource.Info.aggregates()
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|> Stream.filter(&(&1.kind in [:list, :first]))
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|> Stream.filter(& &1.field)
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|> Enum.each(fn aggregate ->
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related = Ash.Resource.Info.related(resource, aggregate.relationship_path)
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type = Ash.Resource.Info.field(related, aggregate.field).type
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case type do
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{:array, _} ->
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raise Spark.Error.DslError,
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module: resource,
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path: [:aggregates, aggregate.name],
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message: """
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Aggregate not supported.
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Aggregate #{inspect(resource)}.#{aggregate.name} is not supported, because its type is `#{aggregate.kind}`, and the destination attribute is an array.
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Postgres does not support multidimensional arrays with differing lengths internally. In the future we may be able to remove this restriction
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for the `:first` type aggregate, but likely never for `:list`. In the meantime, you will have to use a custom calculation to get this data.
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"""
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_ ->
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:ok
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end
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end)
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{:ok, dsl}
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end
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end
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