This adresses an issue correctly brought up by @ryanswood in PR #644
concerning Rails 4.2 where params#to_unsafe_h still needs to be
converted from a Hash to a HWIA to respond to symbol hash keys.
I prefer to trying adding a conditional on Active Record version rather
than an extra HWIA conversion.
The tests are run for Rails 4 and 5, since ActionController::Parameters
was backported to 4.x.
Rails 3 raises if ActionController::Parameters is invoked, so the tests
are skipped in that case.
This commit is necessary because when the following is run:
ActionController::Parameters.new(q: 1).to_unsafe_h.fetch(:q)
with Rails 5 it works, but not with Rails 4.2. The reason is that in
Rails 5, #to_unsafe_h calls
StrongParameters::convert_parameters_to_hashes which converts hashes to
HWIA, whereas in Rails 4.2 it just calls #to_hash without HWIA.
14e66ca59e