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123 lines
3 KiB
Elixir
123 lines
3 KiB
Elixir
defmodule AshPostgres.Calculation do
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@moduledoc false
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require Ecto.Query
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def add_calculations(query, [], _, _), do: {:ok, query}
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def add_calculations(query, calculations, resource, source_binding) do
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query = AshPostgres.DataLayer.default_bindings(query, resource)
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{:ok, query} =
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AshPostgres.Join.join_all_relationships(
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query,
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%Ash.Filter{
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resource: resource,
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expression: Enum.map(calculations, &elem(&1, 1))
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},
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left_only?: true
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)
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aggregates =
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calculations
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|> Enum.flat_map(fn {_calculation, expression} ->
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used_calculations =
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Ash.Filter.used_calculations(
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expression,
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query.__ash_bindings__.resource,
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[]
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)
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AshPostgres.Aggregate.used_aggregates(
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expression,
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query.__ash_bindings__.resource,
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used_calculations,
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[]
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)
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end)
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|> Enum.uniq()
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case AshPostgres.Aggregate.add_aggregates(
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query,
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aggregates,
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query.__ash_bindings__.resource,
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false,
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source_binding
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) do
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{:ok, query} ->
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query =
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if query.select do
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query
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else
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Ecto.Query.select_merge(query, %{})
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end
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dynamics =
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Enum.map(calculations, fn {calculation, expression} ->
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type =
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AshPostgres.Types.parameterized_type(
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calculation.type,
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Map.get(calculation, :constraints, [])
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)
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expression =
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Ash.Actions.Read.add_calc_context_to_filter(
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expression,
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calculation.context[:actor],
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calculation.context[:authorize?],
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calculation.context[:tenant],
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calculation.context[:tracer]
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)
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expr =
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AshPostgres.Expr.dynamic_expr(
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query,
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expression,
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query.__ash_bindings__,
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false,
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type
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)
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expr =
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if type do
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Ecto.Query.dynamic(type(^expr, ^type))
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else
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expr
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end
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{calculation.load, calculation.name, expr}
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end)
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{:ok, add_calculation_selects(query, dynamics)}
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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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defp add_calculation_selects(query, dynamics) do
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{in_calculations, in_body} =
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Enum.split_with(dynamics, fn {load, _name, _dynamic} -> is_nil(load) end)
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calcs =
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in_body
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|> Map.new(fn {load, _, dynamic} ->
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{load, dynamic}
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end)
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calcs =
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if Enum.empty?(in_calculations) do
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calcs
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else
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Map.put(
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calcs,
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:calculations,
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Map.new(in_calculations, fn {_, name, dynamic} ->
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{name, dynamic}
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end)
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)
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end
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Ecto.Query.select_merge(query, ^calcs)
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end
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end
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