ActiveSupport::Notifications::Instrumenter#instrument should yield
its payload the same way that ActiveSupport::Notifications does.
Fix spelling in test name.
I think "uniq" is more Rails-y than select("distinct(categories.id)")
Minor copy editing
update README since email-service isn't a word
Uniq cannot be used directly on an ActiveRecord model. 'DISTINCT field' is the only pluck query that translates into the aforementioned SQL
Cast number to string in Postgres

fixes #9170
Document nested attributes as hash of hashes

Document the possibility to use a hash of hashes for nested attributes for a one-to-many association (in addition to the documented possibility to use an array of hashes).
Align indentation in comments
Fix my typo
Fix missing closing <tt> tag
clarify verbiage
absence validator doc
fix absence validator doc for boolean field
fix missing to
do some typo fixing
Handle conditional get in live requests - this will prevent error when using stale on live streams(issue #9636)
Merge pull request #9713 from imanel/live_stale

Handle conditional get in live requests
extract factory method and push common code up to abstract adapter
use the method so we do not depend on internal ivars
hashes are ordered, so just use the columns_hash ivar