Do not let use `serialize` on native JSON/array column

2 files changed, 18 insertions, 0 deletions

diff --git a/activerecord/test/cases/adapters/postgresql/array_test.rb b/activerecord/test/cases/adapters/postgresql/array_test.rb
index 8507dbb463..08b17f37e2 100644
--- a/activerecord/test/cases/adapters/postgresql/array_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/array_test.rb
@@ -47,6 +47,15 @@ class PostgresqlArrayTest < ActiveRecord::PostgreSQLTestCase
     assert ratings_column.array?
   end
 
+  def test_not_compatible_with_serialize
+    new_klass = Class.new(PgArray) do
+      serialize :tags, Array
+    end
+    assert_raises(ActiveRecord::AttributeMethods::Serialization::ColumnNotSerializableError) do
+      new_klass.new
+    end
+  end
+
   def test_default
     @connection.add_column "pg_arrays", "score", :integer, array: true, default: [4, 4, 2]
     PgArray.reset_column_information
diff --git a/activerecord/test/cases/adapters/postgresql/json_test.rb b/activerecord/test/cases/adapters/postgresql/json_test.rb
index aa5e03df41..79dcfe110c 100644
--- a/activerecord/test/cases/adapters/postgresql/json_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/json_test.rb
@@ -33,6 +33,15 @@ module PostgresqlJSONSharedTestCases
     x.reload
     assert_equal ["foo" => "bar"], x.objects
   end
+
+  def test_not_compatible_with_serialize_macro
+    new_klass = Class.new(klass) do
+      serialize :payload, JSON
+    end
+    assert_raises(ActiveRecord::AttributeMethods::Serialization::ColumnNotSerializableError) do
+      new_klass.new
+    end
+  end
 end
 
 class PostgresqlJSONTest < ActiveRecord::PostgreSQLTestCase