User defined types should not raise an error

Fixes #15697 on 4-1-stable.

activerecord/CHANGELOG.md

@@ -1,3 +1,9 @@
+*   Don't error when quoting user defined types in PostgreSQL.
+
+    Fixes #15697.
+
+    *Sean Griffin*
+
 *   Ensure both parent IDs are set on join records when both sides of a
     through association are new.
 

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

@@ -16,7 +16,7 @@ def unescape_bytea(value)
 
         # Quotes PostgreSQL-specific data types for SQL input.
         def quote(value, column = nil) #:nodoc:
-          return super unless column
+          return super unless column && column.type
 
           sql_type = type_to_sql(column.type, column.limit, column.precision, column.scale)
 

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

@@ -0,0 +1,28 @@
+require 'cases/helper'
+
+class PostgreSQLCustomDomainTest < ActiveRecord::TestCase
+  class CustomDomain < ActiveRecord::Base
+  end
+
+  setup do
+    @connection = ActiveRecord::Base.connection
+    @connection.execute "CREATE DOMAIN password AS TEXT"
+    @connection.create_table :custom_domains do |t|
+      t.column :passwd, 'password'
+    end
+  end
+
+  teardown do
+    if @connection
+      @connection.execute 'DROP TABLE IF EXISTS custom_domains'
+      @connection.execute 'DROP DOMAIN IF EXISTS password'
+    end
+  end
+
+  test "custom domain types do not create errors" do
+    silence_warnings do
+      record = CustomDomain.create!(passwd: 'password')
+      assert_equal record.id, CustomDomain.where(passwd: 'password').last.id
+    end
+  end
+end