`initialize_on_precompile` is not used anymore.
Merge pull request #10833 from hone/remove_initialize_on_precompile

`initialize_on_precompile` is not used anymore.
Fix #10932. Treat "" and "::" as invalid on constantize
Merge pull request #10943 from killthekitten/10932_constantize_empty

Fix #10932. Treat "" and "::" as invalid on constantize
Added an example of the query without except before the example with except
Merge pull request #10937 from prathamesh-sonpatki/except_example

Added an example of the query without except before the example with except
Use DatabaseTasks.env instead of Rails.env in databases.rake
Properly namespace DatabaseTasks