private method doesn't work for singleton methods defined this way
Add tests to ActiveSupport:XmlMini to_tag method
Fix insertion of records for hmt association with scope, fix #3548
Auto-generate stable fixture UUIDs on PostgreSQL.
Fixes: #11524
[Active Record] Renamed private methods create_record and update_record

 This is to ensure that they are not accidentally called by the app code.
 They are renamed to _create_record and _update_record respectively.
 Closes #11645
Refactor test to use DdlHelper.

Follow-Up to https://github.com/rails/rails/pull/14400

This ensures that all tables are removed after each test and thereby
allowing us to run the tests in a random order.
Require yaml explicitly
Merge pull request #14474 from tgxworld/table_cleanup_after_each_test

Refactor test to use DdlHelper.
No need to call to_sym

It is already called inside type_to_sql method.
fix bug on non empty defaults for pg array columns

fixes #10613
Merge pull request #14528 from planas/patch-1

Require yaml explicitly on #database_configuration
fix mysql builds
Do not overwrite selected and disabled attributes
Fix polymorphic preloads on NOT NULL _type columns.

Defer to Association#klass instead of having a custom/duplicate code.
Merge pull request #14509 from lukesteensen/pg-array-defaults

remove calls to sql_type on pg columns
Simplify Preloader#grouped_records code.

The new method relies on AR::Associations::Association knowing about both reflection and a model class.

AR::Base#association now raises a descriptive error when trying to access non-existent associations. Previously it would blow up with a confusing NoMethodError: undefined method `association_class' for nil:NilClass.
Tiny doc fix for Strong Parameters

- accepts_nested_attribute_for -> accepts_nested_attributes_for
Merge pull request #14535 from iancanderson/patch-1

Tiny doc fix for Strong Parameters
refactor, put `PostgreSQLColumn` into `column.rb`.

We have `connection_adapters/column.rb` so it's easier to remember
that the column in in a separate file.
Merge pull request #14532 from thedarkone/polymorphic-preload-fix

Fix polymorphic preloads on NOT NULL _type columns