* Fix specs on Rails 6 RC2
`ActiveRecord::MigrationContext` now has a `schema_migration` attribute.
Ref: https://github.com/rails/rails/pull/36439/files#diff-8d3c44120f7b67ff79e2fbe6a40d0ad6R1018
* Use `media_type` instead of `content_type`
Before Rails 6 RC2, the `ActionDispatch::Response#content_type` method
would return only the media part of the `Content-Type` header, without any
other parts. Now the `#content_type` method returns the entire header -
as it is - and `#media_type` should be used instead to get the previous
behavior.
Ref:
- https://github.com/rails/rails/pull/36034
- https://github.com/rails/rails/pull/36854
* Use render template instead of render file
Render file will need the full path in order to avoid security breaches.
In this particular case, there's no need to use render file, it's ok to
use render template.
Ref: https://github.com/rails/rails/pull/35688
* Don't set `represent_boolean_as_integer` on Rails 6
* Update comments [ci skip]
