avoiding iterations and calling of underscore on all elements of array

Test order dependency fixes

[ci skip] typo in ArgumentError in 4_0_release_notes.md

Fix bad test order dependency between LoadAllFixturesTest#test_all_there and FoxyFixturesTest#test_ignores_belongs_to_symbols_if_association_and_foreign_key_are_named_the_same

Fix bad test order dependency between test/cases/validations/i18n_generate_message_validation_test.rb and test/cases/validations/uniqueness_validation_test.rb

[ci skip] Update gem versions for 3.2 and 3.1. Also change some words.

Use set_backtrace instead of @backtrace in ActionView error

Change Relation#all to Relation#load [ci skip]

Merge pull request #12779 from dougbarth/dont_swallow_exceptions_during_transactional_statements_in_mysql

Don't swallow exceptions in transctional statements

Explicitly exit with status "1" for create and drop task failures

Conflicts:
	activerecord/CHANGELOG.md

From PR, @tenderlove would prefer to not maintain these tests.

Allocate one less object using html_safe during content_tag construction

Fix #10847: allow to pass a block to `cattr_reader`.

added one test case and example for ActiveRecord::Base.to_param method

Remove broken Commmand Line guide link

[ci skip]

Example:

    class A
      cattr_reader(:defr) { 'default_reader_value' }
    end
    A.defr # => 'default_reader_value'

Fix CHANGELOG typo [ci skip]

Only set the value once after it's calculated.

Take Hash with options inside Array in #url_for

Example:

    >> r = /some-regexp/
    => /some-regexp/
    >> r.source.object_id == r.source.object_id
    => false