Require missing association in test
Fix "nonexistent" typo in tests
remove useless methods
Merge pull request #17889 from mxie/mx-fix-nonexistent-typo

Fix "nonexistent" typo in tests
Removed use of mocha in the info_controller tests
[ci skip] remove references to `Numeric#from_now`
Merge pull request #17892 from y-yagi/active_support_core_extensions_guide

[ci skip] remove references to `Numeric#from_now`
Merge pull request #17890 from sergey-alekseev/remove-useless-methods

remove useless methods
skip test to get `sqlite3_mem` suite passing.
document that `.delete` does work on `#readonly?` records. Closes #11860

[ci skip]

This is due to the fact that `.delete` is directly translated to SQL.
It tries to follow the same rules as `.delete_all` which is not able
to verify that records are `#readonly?`.
Failure to rollback t.timestamps when within a change_table migration

When running the following migration:

    change_table(:table_name) { |t| t/timestamps }

The following error was produced:

    wrong number of arguments (2 for 1) .... /connection_adapters/abstract/schema_statements.rb:851:in `remove_timestamps'

This is due to `arguments` containing an empty hash as its second
argument.
Move PredicateBuilder instantiation to constructor

In order to maintain thread safety and prevent race condition from memoization.
Merge pull request #17651 from CLUSTERfoo/fix/adding_timestamps_migration_not_reversible

Failure to rollback t.timestamps when within a change_table migration
docs, add new changelog entries at the top :sweat: [ci skip] #17651
Active Record changelog needs to keep pointing at 4-2-stable. #17651

[ci skp]
Merge pull request #17898 from mrgilman/move-predicate-builder-to-constructor

Move PredicateBuilder instantiation to constructor
Merge pull request #17891 from prathamesh-sonpatki/remove-mocha-from-info-controller-tests

Removed use of mocha in the info_controller tests
Clarify that batching methods can be used with any orderable type primary key, not just integer ones, as per @a58cafeb3a86be46849de57481b6644094fb8165
Prevent Symbol GC
Add documentation to MessageVerifier

[ci skip]

Complements #17727 and closes ee73d9ff8.

@lleger How do you feel about this?