This patch
- reduces the duplication among the `reference`-family methods.
- better explains all the optians available for `add_reference`.
- redirects to user from `references` to `add_reference`.
Originated by #20184.
Fix the guide to state that Rails uses Minitest as the default test
framework.
Remove unnecessary mention to Test::Unit from the API docs
('constantize' and 'safe_constantize').
Active Record detects when the process has forked and automatically
creates a new connection pool to avoid sharing file descriptors.
If the existing connection pool had a schema cache associated with it,
the new pool should copy it to avoid unnecessarily querying the database
for its schema.
The code to detect that the process has forked is in ConnectionHandler,
but the existing test for it was in the ConnectionManagement test file.
I moved it to the right place while I was writing the new test for this
change.
this removes the following warning:
```
test/core_ext/integer_ext_test.rb:34: warning: ambiguous first argument; put parentheses or a space even after `-' operator
test/core_ext/integer_ext_test.rb:38: warning: ambiguous first argument; put parentheses or a space even after `-' operator
```
When one rendered a partial template without specifying an object
or a collection (e.g. <%= render partial: 'partial_name' %>), Rails
would make an object called :partial_name available in local_assigns.
I don't think this was the intended behavior, since no local variable
called 'partial_name' gets defined in the view.
Renamed `@reserved_connections` -> `@thread_cached_conns`. New name
clearly conveys the purpose of the cache, which is to speed-up
`#connection` method.
The new `@thread_cached_conns` now also uses `Thread` objects as keys
(instead of previously `Thread.current.object_id`).
Since there is no longer any synchronization around
`@thread_cached_conns`, `disconnect!` and `clear_reloadable_connections!`
methods now pre-emptively obtain ownership (via `checkout`) of all
existing connections, before modifying internal data structures.
A private method `release` has been renamed `thread_conn_uncache` to
clear-up its purpose.
Fixed some brittle `thread.status == "sleep"` tests (threads can go
into sleep even without locks).
In Rails 4.0, json decoding relied on MultiJson. This changed from 4.1
forward since it reached its end of life, and this extra argument was
kept for compatibility. We are safe to remove it now.
