I am getting an error on a view when I move my app to

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Asked: June 5, 20262026-06-05T16:05:56+00:00 2026-06-05T16:05:56+00:00

I am getting an error on a view when I move my app to

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I am getting an error on a view when I move my app to Heroku that I am not getting in development or locally in production mode.
I started with the Devise Mongoid app from railsapp.github.com and added bootstrap.

When I deploy to Heroku I get the following error on the Devise navigation parcial,

ActionView::Template::Error (can't convert Array into String):

Im using Mongoid 3.0.0.rc

I think it’s related to Mongoid because I was able to get it work originally with 2.4.10 but now I get other errors with that version.
Also, If I comment out the lines in the parcial where it errors, it loads the root okay but eventually crashes out if I navigate around.

I’m running out of ideas!

I can post logs or configuration files if that would help.