fix: cast calcs in query expressions

lib/expr.ex

@@ -442,9 +442,10 @@ defmodule AshPostgres.Expr do
          },
          bindings,
          embedded?,
-         type
+         _type
        ) do
     calculation = %{calculation | load: calculation.name}
+    type = AshPostgres.Types.parameterized_type(calculation.type, [])
 
     case Ash.Filter.hydrate_refs(
            calculation.module.expression(calculation.opts, calculation.context),
@@ -519,7 +520,7 @@ defmodule AshPostgres.Expr do
          } = ref,
          bindings,
          embedded?,
-         type
+         _type
        ) do
     binding_to_replace =
       Enum.find_value(bindings.bindings, fn {i, binding} ->
@@ -533,6 +534,8 @@ defmodule AshPostgres.Expr do
       |> Map.delete(0)
       |> Map.update!(binding_to_replace, &Map.merge(&1, %{path: [], type: :root}))
 
+    type = AshPostgres.Types.parameterized_type(calculation.type, [])
+
     case Ash.Filter.hydrate_refs(
            calculation.module.expression(calculation.opts, calculation.context),
            %{

test/calculation_test.exs

@@ -248,6 +248,7 @@ defmodule AshPostgres.CalculationTest do
   test "calculations using if and literal boolean results can run" do
     Post
     |> Ash.Query.load(:was_created_in_the_last_month)
+    |> Ash.Query.filter(was_created_in_the_last_month == true)
     |> Api.read!()
   end
 

test/support/resources/post.ex

@@ -99,11 +99,11 @@ defmodule AshPostgres.Test.Post do
       :boolean,
       expr(
         # This is written in a silly way on purpose, to test a regression
-        if fragment("(? <= (now() - '1 month'::interval))", created_at) do
-          true
-        else
+        if(
+          fragment("(? <= (now() - '1 month'::interval))", created_at),
+          true,
           false
-        end
+        )
       )
     )
   end