fix: use schema when changing reference deferrability

lib/migration_generator/operation.ex

@@ -454,16 +454,34 @@ defmodule AshPostgres.MigrationGenerator.Operation do
     @moduledoc false
     defstruct [:table, :schema, :references, :direction, no_phase: true]
 
-    def up(%{direction: :up, table: table, references: %{name: name, deferrable: true}}) do
-      "execute(\"ALTER TABLE #{table} alter CONSTRAINT #{name} DEFERRABLE INITIALLY IMMEDIATE\");"
+    defp prefix_name(name, prefix) do
+      if prefix do
+        "#{prefix}.#{name}"
+      else
+        name
+      end
+    end
+
+    def up(%{
+          direction: :up,
+          schema: schema,
+          table: table,
+          references: %{name: name, deferrable: true}
+        }) do
+      "execute(\"ALTER TABLE #{prefix_name(table, schema)} ALTER CONSTRAINT #{name} DEFERRABLE INITIALLY IMMEDIATE\");"
     end
 
-    def up(%{direction: :up, table: table, references: %{name: name, deferrable: :initially}}) do
-      "execute(\"ALTER TABLE #{table} alter CONSTRAINT #{name} DEFERRABLE INITIALLY DEFERRED\");"
+    def up(%{
+          direction: :up,
+          schema: schema,
+          table: table,
+          references: %{name: name, deferrable: :initially}
+        }) do
+      "execute(\"ALTER TABLE #{prefix_name(table, schema)} ALTER CONSTRAINT #{name} DEFERRABLE INITIALLY DEFERRED\");"
     end
 
-    def up(%{direction: :up, table: table, references: %{name: name}}) do
-      "execute(\"ALTER TABLE #{table} alter CONSTRAINT #{name} NOT DEFERRABLE\");"
+    def up(%{direction: :up, schema: schema, table: table, references: %{name: name}}) do
+      "execute(\"ALTER TABLE #{prefix_name(table, schema)} ALTER CONSTRAINT #{name} NOT DEFERRABLE\");"
     end
 
     def up(_), do: ""

test/migration_generator_test.exs

@@ -1499,6 +1499,90 @@ defmodule AshPostgres.MigrationGeneratorTest do
       assert File.read!(file) =~ ~S{create index(:posts, [:post_id])}
     end
 
+    test "references with deferrable modifications generate changes with the correct schema" do
+      defposts do
+        attributes do
+          uuid_primary_key(:id)
+          attribute(:key_id, :uuid, allow_nil?: false, public?: true)
+          attribute(:foobar, :string, public?: true)
+        end
+
+        postgres do
+          schema "example"
+        end
+      end
+
+      defposts Post2 do
+        attributes do
+          uuid_primary_key(:id)
+          attribute(:name, :string, public?: true)
+          attribute(:related_key_id, :uuid, public?: true)
+        end
+
+        relationships do
+          belongs_to(:post, Post) do
+            public?(true)
+          end
+        end
+
+        postgres do
+          schema "example"
+
+          references do
+            reference(:post, index?: true, deferrable: :initially)
+          end
+        end
+      end
+
+      defdomain([Post, Post2])
+
+      AshPostgres.MigrationGenerator.generate(Domain,
+        snapshot_path: "test_snapshots_path",
+        migration_path: "test_migration_path",
+        quiet: true,
+        format: false
+      )
+
+      defposts Post2 do
+        attributes do
+          uuid_primary_key(:id)
+          attribute(:name, :string, public?: true)
+          attribute(:related_key_id, :uuid, public?: true)
+        end
+
+        relationships do
+          belongs_to(:post, Post) do
+            public?(true)
+          end
+        end
+
+        postgres do
+          schema "example"
+
+          references do
+            reference(:post, index?: true, deferrable: true)
+          end
+        end
+      end
+
+      AshPostgres.MigrationGenerator.generate(Domain,
+        snapshot_path: "test_snapshots_path",
+        migration_path: "test_migration_path",
+        quiet: true,
+        format: false
+      )
+
+      assert file =
+               "test_migration_path/**/*_migrate_resources*.exs"
+               |> Path.wildcard()
+               |> Enum.reject(&String.contains?(&1, "extensions"))
+               |> Enum.sort()
+               |> Enum.at(1)
+               |> File.read!()
+
+      assert file =~ ~S{execute("ALTER TABLE example.posts ALTER CONSTRAINT}
+    end
+
     test "index generated by index? true also adds column when using attribute multitenancy" do
       defresource Org, "orgs" do
         attributes do