Cosmetic changes: remove trailing whitespaces from tests

update AC::Parameters#permit documentation [ci skip]

bdd105d8 changes the behaviour of AC::Parameters#permit.

params.require(:person).permit(:projects_attributes) was returning
=> {"projects_attributes"=>{"0"=>{"name"=>"Project 1"}}}

When should return
=> {}

You should be doing ...
params.require(:person).permit(projects_attributes: :name)
to get just the projects attributes you want to allow

CacheDigests: Support templates in directories several levels deep

assert_template works when the same partial was rendered multiple times

No need to test for rack-cache present in gem file

this refactoring extracts the semi complex data structure of rendered locals
per view into into a separate class

as it's removed here 
1fc79546

 

Expand the caveat about models in migrations in the rails guide.

Eager autoload Preloader classes

Without eager autoloading, these would be autoloaded
only when #preloader_for is called, which is too late
in threaded applications.

This is an attempt to address issue #6939, where an earlier migration
added a column to the database, and a later migration uses a model and
references that column.

When both migrations were run together with `rake db:migrate` the column
information in memory still referenced the old table structure.

Running the migrations separately fixed this, as a new connection was
then established before referencing the model. Explicitly calling
`reset_column_information` is a more reliable workaround.

remove duplicated require statements in AR test cases

Build failed with an error "invalid multibyte char (US-ASCII)" in these
files. Apparently, some UTF-8 char disguised as whitespace causes this.

Thanks @rafaelfranca

Offer instructions for pg gem when installed via Homebrew

Moving to new hash syntax

Conflicts:
	activerecord/lib/active_record/persistence.rb
	railties/lib/rails/generators/rails/resource_route/resource_route_generator.rb

This reverts commit 1c02b988.

This reverts commit 93b1ca8b.

Fix AS::Cache version upgrading bug

Remove old asset tag concatenation

Use sprockets, jammit, or some other asset bundler