Merge pull request rails#49998 from fatkodima/fix-pg-rename_table-with-uuid-pk

Fix renaming primary key index when renaming a PostgreSQL table having uuid primary key

Author: jonathanhefner

activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb

@@ -341,7 +341,7 @@ def pk_and_sequence_for(table) # :nodoc:
               JOIN pg_namespace   nsp  ON (t.relnamespace = nsp.oid)
               WHERE t.oid = #{quote(quote_table_name(table))}::regclass
                 AND cons.contype = 'p'
-                AND pg_get_expr(def.adbin, def.adrelid) ~* 'nextval|uuid_generate'
+                AND pg_get_expr(def.adbin, def.adrelid) ~* 'nextval|uuid_generate|gen_random_uuid'
             SQL
           end
 

activerecord/test/cases/adapters/postgresql/rename_table_test.rb

@@ -5,7 +5,6 @@
 class PostgresqlRenameTableTest < ActiveRecord::PostgreSQLTestCase
   def setup
     @connection = ActiveRecord::Base.connection
-    @connection.create_table :before_rename, force: true
   end
 
   def teardown
@@ -14,14 +13,36 @@ def teardown
   end
 
   test "renaming a table also renames the primary key index" do
-    assert_changes(-> { num_indices_named("before_rename_pkey") }, from: 1, to: 0) do
-      assert_changes(-> { num_indices_named("after_rename_pkey") }, from: 0, to: 1) do
-        @connection.rename_table :before_rename, :after_rename
-      end
+    @connection.create_table :before_rename, force: true
+
+    assert_renames_index("before_rename_pkey", "after_rename_pkey") do
+      @connection.rename_table :before_rename, :after_rename
+    end
+  end
+
+  test "renaming a table with uuid primary key and uuid_generate_v4() default also renames the primary key index" do
+    @connection.create_table :before_rename, force: true, id: :uuid, default: -> { "uuid_generate_v4()" }
+
+    assert_renames_index("before_rename_pkey", "after_rename_pkey") do
+      @connection.rename_table :before_rename, :after_rename
+    end
+  end
+
+  test "renaming a table with uuid primary key and gen_random_uuid() default also renames the primary key index" do
+    @connection.create_table :before_rename, force: true, id: :uuid, default: -> { "gen_random_uuid()" }
+
+    assert_renames_index("before_rename_pkey", "after_rename_pkey") do
+      @connection.rename_table :before_rename, :after_rename
     end
   end
 
   private
+    def assert_renames_index(from, to, &block)
+      assert_changes(-> { num_indices_named(from) }, from: 1, to: 0) do
+        assert_changes(-> { num_indices_named(to) }, from: 0, to: 1, &block)
+      end
+    end
+
     def num_indices_named(name)
       @connection.execute(<<~SQL).values.length
         SELECT 1 FROM "pg_index"