I have an application with mongoid hosted on heroku (cedar) / unicorn.

When I change the mongoid version from 3.0.10 to anything newer and push to heroku, those steps in the push are not executed for some reason:

-----> Preparing app for Rails asset pipeline
Running: rake assets:precompile
Asset precompilation completed (48.30s)

The result are server errors because X is not precompiled (every asset)

Another strange thing is that I can heroku run rake assets:precompile --trace that seem to complete without errors, but when the app is accessed, server still returns 500: X not precompiled.

The list of things fixed in 3.0.11 doesn't seem to show anything relevant:

Resolved Issues

• MONGOID-2522 Fixed Criteria#with to return the criteria and not the class.
• MONGOID-2518 Fix unit of work call for the identity map when using Passenger.
• MONGOID-2512 Ensure nested attributes destroy works with the delayed destroys introduced in 3.0.10 when multiple levels deep.
• MONGOID-2509 Don't hit identity map an extra time when the returned value is an empty hash. (Douwe Maan)

Maybe someone have ideas what could've had changed?