The relation method `update_all` allows you to pass a SQL fragment. The
functionality is already mentioned in the prose but the examples section
does not cover it.
As reported via #26904, there is a regression in how values for
Postgres' HStore column type are being processed, beginning in Rails 5.
Currently, the way that Active Record checks whether or not values need
to be serialized and put into the correct storage format is whether or
not it is a `Hash` object. Since `ActionController::Parameters` no
longer inherits from `Hash` in Rails 5, this conditional now returns
false. To remedy this, we are now checking to see whether the `value`
parameters being passed in responds to a certain method, and then
calling the `serialize` method, except this time with a real Hash
object. Keeping things DRY!
Fixes#26904.
AS::Testing::Isolation has two ways to isolate the process:
forking and subprocessing. The second way is used on JRuby and other
platforms that don't support forking.
The way how subprocessing works is that we prepare a command to run a
new process:
```
/opt/rubies/2.3.0/bin/ruby -I{skipped_load_path} test/initializable_test.rb '' -nInitializableTests::Basic#test_Initializer_provides_context's_class_name
```
As you see, there's unescaped quote at the end of the line.
It leads to:
```
sh: -c: line 0: unexpected EOF while looking for matching `''
sh: -c: line 1: syntax error: unexpected end of file
```
This fixes tests on MRI + NO_FORK variable and on JRuby 🎉
This reverts commit bad3a120f1690f393d8f6204b3ceee60f0ce707b, reversing
changes made to 2384317465ccb1dfca456a2b7798714b99f32711.
Reason: Adding a new option in the API for something that can be done
with a `#presence` check could do.
`rails plugin new` with `--full` and `--skip-sprockets` options generates a dummy application that throws `NoMethodError`.
```
% rails plugin new my_engine -S --full --skip-gemspec
% cd my_engine
% bin/rails test
rails aborted!
NoMethodError: undefined method `assets' for #<Rails::Application::Configuration:0x007f83aa1e6100>
```
Caused by 007e50d8e5a900547471b6c4ec79d9d217682c5d.
https://github.com/rails/rails/pull/26925 was closed in favor of dcb364e.
But dcb364e is only fixed sqlite3 adapter and still broken mysql2
adapter with `prepared_statements: true` (`exec_stmt_and_free`).
```diff
diff --git a/activerecord/test/config.example.yml b/activerecord/test/config.example.yml
index 58e2d45..7b3c1a6 100644
--- a/activerecord/test/config.example.yml
+++ b/activerecord/test/config.example.yml
@@ -56,9 +56,11 @@ connections:
username: rails
encoding: utf8
collation: utf8_unicode_ci
+ prepared_statements: true
arunit2:
username: rails
encoding: utf8
+ prepared_statements: true
oracle:
arunit:
```
```
% be rake test_mysql2 --verbose
...
Using mysql2
/Users/kamipo/src/github.com/rails/rails/activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb:90: warning: assigned but unused variable - result
/Users/kamipo/src/github.com/rails/rails/activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb:101:in `block in exec_stmt_and_free': NameError: undefined local variable or method `result' for #<ActiveRecord::ConnectionAdapters::Mysql2Adapter:0x007fe2c50eb140>: SELECT `ar_internal_metadata`.* FROM `ar_internal_metadata` WHERE `ar_internal_metadata`.`key` = ? LIMIT ? (ActiveRecord::StatementInvalid)
from /Users/kamipo/src/github.com/rails/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:586:in `block in log'
...
```
