fix: properly detect nested array decimals

Author: zachdaniel

lib/migration_generator/migration_generator.ex

@@ -3593,8 +3593,8 @@ defmodule AshPostgres.MigrationGenerator do
     ["decimal", precision, scale]
   end
 
-  defp sanitize_type(type, size, precision, decimal) when is_atom(type) and is_integer(size) do
-    [sanitize_type(type, nil, precision, decimal), size]
+  defp sanitize_type(type, size, precision, decimal) when is_tuple(type) do
+    sanitize_type(elem(type, 0), size, precision, decimal)
   end
 
   defp sanitize_type(type, _, _, _) do

test/migration_generator_test.exs

@@ -2511,6 +2511,11 @@ defmodule AshPostgres.MigrationGeneratorTest do
             public?: true
           )
 
+          attribute(:decimal_list, {:array, :decimal},
+            default: [Decimal.new("123.4567890987654321987")],
+            public?: true
+          )
+
           attribute(:name, :string, default: "Fred", public?: true)
           attribute(:tag, :atom, default: :value, public?: true)
           attribute(:enabled, :boolean, default: false, public?: true)