Schema dumping support for PostgreSQL oid type

Closes #27980

3 files changed, 12 insertions, 11 deletions

diff --git a/activerecord/test/cases/adapters/postgresql/datatype_test.rb b/activerecord/test/cases/adapters/postgresql/datatype_test.rb
index dc17a715e8..0725fde5ae 100644
--- a/activerecord/test/cases/adapters/postgresql/datatype_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/datatype_test.rb
@@ -33,7 +33,7 @@ class PostgresqlDataTypeTest < ActiveRecord::PostgreSQLTestCase
   end
 
   def test_data_type_of_oid_types
-    assert_equal :integer, @first_oid.column_for_attribute(:obj_id).type
+    assert_equal :oid, @first_oid.column_for_attribute(:obj_id).type
   end
 
   def test_time_values
diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb
index ea860ef5de..68193af16c 100644
--- a/activerecord/test/cases/schema_dumper_test.rb
+++ b/activerecord/test/cases/schema_dumper_test.rb
@@ -286,6 +286,11 @@ class SchemaDumperTest < ActiveRecord::TestCase
       assert_match %r{t\.interval\s+"scaled_time_interval",\s+precision: 6$}, output
     end
 
+    def test_schema_dump_oid_type
+      output = dump_table_schema "postgresql_oids"
+      assert_match %r{t\.oid\s+"obj_id"$}, output
+    end
+
     if ActiveRecord::Base.connection.supports_extensions?
       def test_schema_dump_includes_extensions
         connection = ActiveRecord::Base.connection
diff --git a/activerecord/test/schema/postgresql_specific_schema.rb b/activerecord/test/schema/postgresql_specific_schema.rb
index a390a76a16..d6cc4e2d6e 100644
--- a/activerecord/test/schema/postgresql_specific_schema.rb
+++ b/activerecord/test/schema/postgresql_specific_schema.rb
@@ -33,11 +33,14 @@ ActiveRecord::Schema.define do
     t.interval :scaled_time_interval, precision: 6
   end
 
-  %w(postgresql_oids postgresql_timestamp_with_zones
-      postgresql_partitioned_table postgresql_partitioned_table_parent).each do |table_name|
-    drop_table table_name, if_exists: true
+  create_table :postgresql_oids, force: true do |t|
+    t.oid :obj_id
   end
 
+  drop_table 'postgresql_timestamp_with_zones', if_exists: true
+  drop_table 'postgresql_partitioned_table', if_exists: true
+  drop_table 'postgresql_partitioned_table_parent', if_exists: true
+
   execute "DROP SEQUENCE IF EXISTS companies_nonstd_seq CASCADE"
   execute "CREATE SEQUENCE companies_nonstd_seq START 101 OWNED BY companies.id"
   execute "ALTER TABLE companies ALTER COLUMN id SET DEFAULT nextval('companies_nonstd_seq')"
@@ -50,13 +53,6 @@ ActiveRecord::Schema.define do
   end
 
   execute <<_SQL
-  CREATE TABLE postgresql_oids (
-    id SERIAL PRIMARY KEY,
-    obj_id OID
-  );
-_SQL
-
-  execute <<_SQL
   CREATE TABLE postgresql_timestamp_with_zones (
     id SERIAL PRIMARY KEY,
     time TIMESTAMP WITH TIME ZONE