2021-12-21 16:19:24 +13:00
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defmodule AshPostgres.Sort do
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@moduledoc false
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require Ecto.Query
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def sort(query, sort, resource) do
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{:ok, query}
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query = AshPostgres.DataLayer.default_bindings(query, resource)
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sort
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|> sanitize_sort()
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|> Enum.reduce_while({:ok, []}, fn
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{order, %Ash.Query.Calculation{} = calc}, {:ok, query_expr} ->
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type =
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if calc.type do
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AshPostgres.Types.parameterized_type(calc.type, [])
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else
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nil
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end
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calc.opts
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|> calc.module.expression(calc.context)
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|> Ash.Filter.hydrate_refs(%{
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resource: resource,
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aggregates: query.__ash_bindings__.aggregate_defs,
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calculations: %{},
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public?: false
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})
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|> case do
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{:ok, expr} ->
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2022-01-25 11:59:31 +13:00
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expr = AshPostgres.Expr.dynamic_expr(query, expr, query.__ash_bindings__, false, type)
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2021-12-21 16:19:24 +13:00
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{:cont, {:ok, query_expr ++ [{order, expr}]}}
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{:error, error} ->
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{:halt, {:error, error}}
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end
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{order, sort}, {:ok, query_expr} ->
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expr =
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case Map.fetch(query.__ash_bindings__.aggregates, sort) do
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{:ok, binding} ->
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aggregate =
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Ash.Resource.Info.aggregate(resource, sort) ||
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raise "No such aggregate for query aggregate #{inspect(sort)}"
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2022-08-19 06:56:36 +12:00
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{:ok, attribute_type} =
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2021-12-21 16:19:24 +13:00
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if aggregate.field do
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related = Ash.Resource.Info.related(resource, aggregate.relationship_path)
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attr = Ash.Resource.Info.attribute(related, aggregate.field)
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if attr && related do
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{:ok, AshPostgres.Types.parameterized_type(attr.type, attr.constraints)}
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else
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{:ok, nil}
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end
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else
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{:ok, nil}
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end
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default_value =
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aggregate.default || Ash.Query.Aggregate.default_value(aggregate.kind)
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if is_nil(default_value) do
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Ecto.Query.dynamic(field(as(^binding), ^sort))
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else
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2022-08-19 06:56:36 +12:00
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if attribute_type do
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2021-12-21 16:19:24 +13:00
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Ecto.Query.dynamic(
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2022-08-19 06:56:36 +12:00
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coalesce(
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field(as(^binding), ^sort),
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type(^default_value, ^attribute_type)
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)
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2021-12-21 16:19:24 +13:00
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)
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else
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Ecto.Query.dynamic(coalesce(field(as(^binding), ^sort), ^default_value))
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end
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end
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:error ->
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Ecto.Query.dynamic(field(as(^0), ^sort))
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end
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{:cont, {:ok, query_expr ++ [{order, expr}]}}
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end)
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|> case do
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{:ok, []} ->
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{:ok, query}
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{:ok, sort_exprs} ->
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new_query = Ecto.Query.order_by(query, ^sort_exprs)
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sort_expr = List.last(new_query.order_bys)
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new_query =
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new_query
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|> Map.update!(:windows, fn windows ->
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order_by_expr = %{sort_expr | expr: [order_by: sort_expr.expr]}
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Keyword.put(windows, :order, order_by_expr)
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end)
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2022-05-11 14:47:21 +12:00
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|> Map.update!(:__ash_bindings__, &Map.put(&1, :__order__?, true))
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2021-12-21 16:19:24 +13:00
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{:ok, new_query}
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{:error, error} ->
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{:error, error}
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end
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end
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2022-01-25 11:59:31 +13:00
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def order_to_ecto([]), do: []
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def order_to_ecto(order) when is_list(order) do
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Enum.map(order, &do_order_to_ecto/1)
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end
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def do_order_to_ecto({sort, order}) do
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case order do
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:asc ->
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Ecto.Query.dynamic([row], fragment("? ASC", field(row, ^sort)))
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:desc ->
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Ecto.Query.dynamic([row], fragment("? DESC", field(row, ^sort)))
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:asc_nils_last ->
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Ecto.Query.dynamic([row], fragment("? ASC NULLS LAST", field(row, ^sort)))
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:asc_nils_first ->
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Ecto.Query.dynamic([row], fragment("? ASC NULLS FIRST", field(row, ^sort)))
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:desc_nils_first ->
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Ecto.Query.dynamic([row], fragment("? DESC NULLS FIRST", field(row, ^sort)))
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:desc_nils_last ->
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Ecto.Query.dynamic([row], fragment("? DESC NULLS LAST", field(row, ^sort)))
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"DESC NULLS LAST"
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end
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end
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2021-12-21 16:19:24 +13:00
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def order_to_postgres_order(dir) do
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case dir do
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:asc -> nil
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:asc_nils_last -> " ASC NULLS LAST"
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:asc_nils_first -> " ASC NULLS FIRST"
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:desc -> " DESC"
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:desc_nils_last -> " DESC NULLS LAST"
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:desc_nils_first -> " DESC NULLS FIRST"
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end
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end
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defp sanitize_sort(sort) do
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sort
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|> List.wrap()
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|> Enum.map(fn
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{sort, {order, context}} ->
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{ash_to_ecto_order(order), {sort, context}}
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{sort, order} ->
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{ash_to_ecto_order(order), sort}
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sort ->
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sort
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end)
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end
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defp ash_to_ecto_order(:asc_nils_last), do: :asc_nulls_last
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defp ash_to_ecto_order(:asc_nils_first), do: :asc_nulls_first
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defp ash_to_ecto_order(:desc_nils_last), do: :desc_nulls_last
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defp ash_to_ecto_order(:desc_nils_first), do: :desc_nulls_first
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defp ash_to_ecto_order(other), do: other
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end
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