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Editorial Team
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Editorial Team
Asked: June 10, 20262026-06-10T19:48:22+00:00 2026-06-10T19:48:22+00:00

mongo.rb:1: uninitialized constant MongoMapper (NameError) that’s the error i get on my config/initializers/mongo.rb file.

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mongo.rb:1: uninitialized constant MongoMapper (NameError) that’s the error i get on my config/initializers/mongo.rb file.

i follwed the config tutorial from the http://www.mongodb.org website
that’s the code in mongo.rb file

MongoMapper.connection = Mongo::Connection.new(‘localhost’, 27017)
MongoMapper.database = “#monmil-#{Rails.env}”

if defined?(PhusionPassenger)
PhusionPassenger.on_event(:starting_worker_process) do |forked|
MongoMapper.connection.connect if forked
end
end

thanks in advance

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  1. Editorial Team
    Editorial Team
    2026-06-10T19:48:24+00:00Added an answer on June 10, 2026 at 7:48 pm

    The initializer is no longer needed. That tutorial is outdated. Read the docs on http://mongomapper.com/

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