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Home/ Questions/Q 7662535
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T13:49:36+00:00 2026-05-31T13:49:36+00:00

I’m currently trying to get a Mongo database running alongside Devise. I’m using Rails

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I’m currently trying to get a Mongo database running alongside Devise. I’m using Rails 3.2.2 and Ruby 1.9.3, mongo_mapper 0.11.0, devise 1.1.9, and devise-mongo_mapper 0.0.2. I’ve referred to numerous sources online, but they seem to be invariably outdated.

A huge problem I’m facing right now involves devise-mongo_mapper. With mongod running on the terminal, trying to run the rails server gives me the following:

/usr/local/lib/ruby/gems/1.9.1/gems/devise-1.1.9/lib/devise.rb:193:in `mailer=': undefined method `ref' for ActiveSupport::Dependencies:Module (NoMethodError)
from /usr/local/lib/ruby/gems/1.9.1/gems/devise-1.1.9/lib/devise.rb:195:in `<module:Devise>'
from /usr/local/lib/ruby/gems/1.9.1/gems/devise-1.1.9/lib/devise.rb:4:in `<top (required)>'
from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `require'
from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `each'
from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `block in require'
from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `each'
from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `require'
from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler.rb:122:in `require'
from /home/neilbasu/Desktop/rails_practice_app/onemoremongopractice/config/application.rb:13:in `<top (required)>'
from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands.rb:53:in `require'
from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands.rb:53:in `block in <top (required)>'
from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands.rb:50:in `tap'
from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands.rb:50:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'

I checked online and found this could be because my devise isn’t updated. Trying to update it gave me this:

Bundler could not find compatible versions for gem "devise":
  In Gemfile:
    devise-mongo_mapper (>= 0) ruby depends on
      devise (~> 1.1.0) ruby

    devise (2.0.4)

So basically, the older devise won’t work, and the newest version isn’t compatible with my current devise-mongo_mapper. Is there any way around this? Either a way to get all of these programs working together or a way to not need devise-mongo_mapper at all would be great.

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-31T13:49:37+00:00Added an answer on May 31, 2026 at 1:49 pm

    Take a look at several of the forks.

    They just bumped the version in the gemspec and the code probably works unchanged.

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