mirror of
https://github.com/ash-project/ash_sqlite.git
synced 2024-09-20 05:13:19 +12:00
83 lines
1.8 KiB
Elixir
83 lines
1.8 KiB
Elixir
defmodule AshSqlite.Calculation do
|
|
@moduledoc false
|
|
|
|
require Ecto.Query
|
|
|
|
def add_calculations(query, [], _, _), do: {:ok, query}
|
|
|
|
def add_calculations(query, calculations, resource, _source_binding) do
|
|
query = AshSqlite.DataLayer.default_bindings(query, resource)
|
|
|
|
{:ok, query} =
|
|
AshSqlite.Join.join_all_relationships(
|
|
query,
|
|
%Ash.Filter{
|
|
resource: resource,
|
|
expression: Enum.map(calculations, &elem(&1, 1))
|
|
},
|
|
left_only?: true
|
|
)
|
|
|
|
query =
|
|
if query.select do
|
|
query
|
|
else
|
|
Ecto.Query.select_merge(query, %{})
|
|
end
|
|
|
|
dynamics =
|
|
Enum.map(calculations, fn {calculation, expression} ->
|
|
type =
|
|
AshSqlite.Types.parameterized_type(
|
|
calculation.type,
|
|
Map.get(calculation, :constraints, [])
|
|
)
|
|
|
|
expr =
|
|
AshSqlite.Expr.dynamic_expr(
|
|
query,
|
|
expression,
|
|
query.__ash_bindings__,
|
|
false,
|
|
type
|
|
)
|
|
|
|
expr =
|
|
if type do
|
|
Ecto.Query.dynamic(type(^expr, ^type))
|
|
else
|
|
expr
|
|
end
|
|
|
|
{calculation.load, calculation.name, expr}
|
|
end)
|
|
|
|
{:ok, add_calculation_selects(query, dynamics)}
|
|
end
|
|
|
|
defp add_calculation_selects(query, dynamics) do
|
|
{in_calculations, in_body} =
|
|
Enum.split_with(dynamics, fn {load, _name, _dynamic} -> is_nil(load) end)
|
|
|
|
calcs =
|
|
in_body
|
|
|> Map.new(fn {load, _, dynamic} ->
|
|
{load, dynamic}
|
|
end)
|
|
|
|
calcs =
|
|
if Enum.empty?(in_calculations) do
|
|
calcs
|
|
else
|
|
Map.put(
|
|
calcs,
|
|
:calculations,
|
|
Map.new(in_calculations, fn {_, name, dynamic} ->
|
|
{name, dynamic}
|
|
end)
|
|
)
|
|
end
|
|
|
|
Ecto.Query.select_merge(query, ^calcs)
|
|
end
|
|
end
|