mirror of
https://github.com/ash-project/ash_postgres.git
synced 2024-09-21 05:53:18 +12:00
382 lines
9.1 KiB
Elixir
382 lines
9.1 KiB
Elixir
defmodule AshPostgres.SqlImplementation do
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@moduledoc false
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use AshSql.Implementation
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require Ecto.Query
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@impl true
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def manual_relationship_function, do: :ash_postgres_join
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@impl true
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def manual_relationship_subquery_function, do: :ash_postgres_subquery
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@impl true
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def require_ash_functions_for_or_and_and?, do: true
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@impl true
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def require_extension_for_citext, do: {true, "citext"}
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@impl true
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def expr(
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query,
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%like{arguments: [arg1, arg2], embedded?: pred_embedded?},
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bindings,
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embedded?,
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acc,
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type
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)
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when like in [AshPostgres.Functions.Like, AshPostgres.Functions.ILike] do
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{arg1, acc} =
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AshSql.Expr.dynamic_expr(query, arg1, bindings, pred_embedded? || embedded?, :string, acc)
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{arg2, acc} =
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AshSql.Expr.dynamic_expr(query, arg2, bindings, pred_embedded? || embedded?, :string, acc)
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inner_dyn =
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if like == AshPostgres.Functions.Like do
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Ecto.Query.dynamic(like(^arg1, ^arg2))
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else
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Ecto.Query.dynamic(ilike(^arg1, ^arg2))
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end
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if type != Ash.Type.Boolean do
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{:ok, inner_dyn, acc}
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else
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{:ok, Ecto.Query.dynamic(type(^inner_dyn, ^type)), acc}
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end
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end
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def expr(
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query,
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%AshPostgres.Functions.TrigramSimilarity{
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arguments: [arg1, arg2],
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embedded?: pred_embedded?
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},
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bindings,
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embedded?,
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acc,
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_type
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) do
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{arg1, acc} =
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AshSql.Expr.dynamic_expr(query, arg1, bindings, pred_embedded? || embedded?, :string, acc)
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{arg2, acc} =
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AshSql.Expr.dynamic_expr(query, arg2, bindings, pred_embedded? || embedded?, :string, acc)
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{:ok, Ecto.Query.dynamic(fragment("similarity(?, ?)", ^arg1, ^arg2)), acc}
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end
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def expr(
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query,
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%AshPostgres.Functions.VectorCosineDistance{
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arguments: [arg1, arg2],
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embedded?: pred_embedded?
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},
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bindings,
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embedded?,
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acc,
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_type
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) do
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{arg1, acc} =
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AshSql.Expr.dynamic_expr(query, arg1, bindings, pred_embedded? || embedded?, :string, acc)
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{arg2, acc} =
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AshSql.Expr.dynamic_expr(query, arg2, bindings, pred_embedded? || embedded?, :string, acc)
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{:ok, Ecto.Query.dynamic(fragment("(? <=> ?)", ^arg1, ^arg2)), acc}
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end
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def expr(
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_query,
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_expr,
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_bindings,
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_embedded?,
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_acc,
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_type
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) do
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:error
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end
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@impl true
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def table(resource) do
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AshPostgres.DataLayer.Info.table(resource)
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end
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@impl true
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def schema(resource) do
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AshPostgres.DataLayer.Info.schema(resource)
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end
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@impl true
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def repo(resource, kind) do
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AshPostgres.DataLayer.Info.repo(resource, kind)
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end
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@impl true
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def simple_join_first_aggregates(resource) do
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AshPostgres.DataLayer.Info.simple_join_first_aggregates(resource)
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end
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@impl true
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def list_aggregate(resource) do
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if AshPostgres.DataLayer.Info.pg_version_matches?(resource, ">= 16.0.0") do
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"any_value"
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else
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"array_agg"
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end
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end
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@impl true
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def parameterized_type(type, constraints, no_maps? \\ true)
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def parameterized_type({:parameterized, _, _} = type, _, _) do
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type
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end
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def parameterized_type({:in, type}, constraints, no_maps?) do
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parameterized_type({:array, type}, constraints, no_maps?)
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end
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def parameterized_type({:array, type}, constraints, _) do
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case parameterized_type(type, constraints[:items] || [], false) do
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nil ->
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nil
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type ->
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{:array, type}
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end
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end
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def parameterized_type(Ash.Type.CiString, constraints, no_maps?) do
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parameterized_type(AshPostgres.Type.CiStringWrapper, constraints, no_maps?)
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end
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def parameterized_type(Ash.Type.String, constraints, no_maps?) do
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parameterized_type(AshPostgres.Type.StringWrapper, constraints, no_maps?)
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end
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def parameterized_type(:tsquery, constraints, no_maps?) do
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parameterized_type(AshPostgres.Tsquery, constraints, no_maps?)
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end
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def parameterized_type(type, _constraints, false)
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when type in [Ash.Type.Map, Ash.Type.Map.EctoType],
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do: :map
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def parameterized_type(type, _constraints, true)
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when type in [Ash.Type.Map, Ash.Type.Map.EctoType],
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do: nil
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def parameterized_type(type, constraints, no_maps?) do
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if Ash.Type.ash_type?(type) do
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cast_in_query? =
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if function_exported?(Ash.Type, :cast_in_query?, 2) do
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Ash.Type.cast_in_query?(type, constraints)
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else
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Ash.Type.cast_in_query?(type)
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end
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if cast_in_query? do
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type = Ash.Type.ecto_type(type)
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parameterized_type(type, constraints, no_maps?)
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else
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nil
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end
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else
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if is_atom(type) && :erlang.function_exported(type, :type, 1) do
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type =
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if type == :ci_string do
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:citext
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else
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type
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end
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{:parameterized, type, constraints || []}
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else
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type
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end
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end
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end
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@impl true
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def determine_types(mod, values) do
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Code.ensure_compiled(mod)
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name =
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cond do
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function_exported?(mod, :operator, 0) ->
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mod.operator()
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function_exported?(mod, :name, 0) ->
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mod.name()
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true ->
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nil
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end
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cond do
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:erlang.function_exported(mod, :types, 0) ->
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mod.types()
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:erlang.function_exported(mod, :args, 0) ->
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mod.args()
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true ->
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[:any]
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end
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|> Enum.concat(Map.keys(Ash.Query.Operator.operator_overloads(name) || %{}))
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|> Enum.map(fn types ->
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case types do
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:same ->
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types =
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for _ <- values do
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:same
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end
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closest_fitting_type(types, values)
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:any ->
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for _ <- values do
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:any
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end
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types ->
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closest_fitting_type(types, values)
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end
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end)
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|> Enum.filter(fn types ->
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Enum.all?(types, &(vagueness(&1) == 0))
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end)
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|> case do
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[type] ->
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if type == :any || type == {:in, :any} do
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nil
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else
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type
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end
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# There are things we could likely do here
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# We only say "we know what types these are" when we explicitly know
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_ ->
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Enum.map(values, fn _ -> nil end)
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end
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end
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defp closest_fitting_type(types, values) do
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types_with_values = Enum.zip(types, values)
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types_with_values
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|> fill_in_known_types()
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|> clarify_types()
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end
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defp clarify_types(types) do
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basis =
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types
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|> Enum.map(&elem(&1, 0))
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|> Enum.min_by(&vagueness(&1))
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Enum.map(types, fn {type, _value} ->
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replace_same(type, basis)
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end)
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end
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defp replace_same({:in, type}, basis) do
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{:in, replace_same(type, basis)}
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end
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defp replace_same(:same, :same) do
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:any
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end
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defp replace_same(:same, {:in, :same}) do
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{:in, :any}
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end
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defp replace_same(:same, basis) do
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basis
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end
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defp replace_same(other, _basis) do
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other
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end
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defp fill_in_known_types(types) do
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Enum.map(types, &fill_in_known_type/1)
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end
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defp fill_in_known_type(
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{{:array, type},
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%Ash.Query.Function.Type{arguments: [inner, {:array, type}, constraints]} = func}
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) do
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{:in,
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fill_in_known_type({type, %{func | arguments: [inner, type, constraints[:items] || []]}})}
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end
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defp fill_in_known_type(
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{{:array, type},
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%Ash.Query.Ref{attribute: %{type: {:array, type}, constraints: constraints} = attribute} =
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ref}
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) do
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{:in,
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fill_in_known_type(
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{type,
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%{ref | attribute: %{attribute | type: type, constraints: constraints[:items] || []}}}
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)}
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end
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defp fill_in_known_type(
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{vague_type, %Ash.Query.Function.Type{arguments: [_, type, constraints]}} = func
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)
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when vague_type in [:any, :same] do
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if Ash.Type.ash_type?(type) do
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type = type |> parameterized_type(constraints) |> array_to_in()
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{type || :any, func}
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else
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type =
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if is_atom(type) && :erlang.function_exported(type, :type, 1) do
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{:parameterized, type, []} |> array_to_in()
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else
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type |> array_to_in()
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end
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{type, func}
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end
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end
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defp fill_in_known_type(
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{vague_type, %Ash.Query.Ref{attribute: %{type: type, constraints: constraints}}} = ref
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)
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when vague_type in [:any, :same] do
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if Ash.Type.ash_type?(type) do
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type = type |> parameterized_type(constraints) |> array_to_in()
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{type || :any, ref}
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else
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type =
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if is_atom(type) && :erlang.function_exported(type, :type, 1) do
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{:parameterized, type, []} |> array_to_in()
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else
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type |> array_to_in()
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end
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{type, ref}
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end
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end
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defp fill_in_known_type({type, value}), do: {array_to_in(type), value}
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defp array_to_in({:array, v}), do: {:in, array_to_in(v)}
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defp array_to_in({:parameterized, type, constraints}),
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do: {:parameterized, array_to_in(type), constraints}
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defp array_to_in(v), do: v
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defp vagueness({:in, type}), do: vagueness(type)
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defp vagueness(:same), do: 2
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defp vagueness(:any), do: 1
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defp vagueness(_), do: 0
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end
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