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Home/ Questions/Q 7615597
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T02:40:55+00:00 2026-05-31T02:40:55+00:00

Im trying to follow some online tutorial on annotating my models in rails. However,

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Im trying to follow some online tutorial on annotating my models in rails. However, it seems all the tutorials are either talking about outdated annotation versions or incorrect installations its a mess.

So far Ive tried the following

1) Added this in the Gemfile

gem 'annotate', '2.4.0'

2) Then the command:

bundle install

3) I then saw that the annotation gem was installed and showing up on the command

bundle show

4) lastly in order to annotate my models I used the command

bundle exec annotate --position before

At this point I was expecting my models to be annotated however what I got was the following error message:

/Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/railties/databases.rake:4:in `<top (required)>': undefined method `namespace' for main:Object (NoMethodError)
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/railtie.rb:33:in `load'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/railtie.rb:33:in `block in <class:Railtie>'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/railtie.rb:184:in `instance_exec'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/railtie.rb:184:in `block in load_tasks'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/railtie.rb:184:in `each'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/railtie.rb:184:in `load_tasks'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/engine.rb:423:in `block in load_tasks'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/application/railties.rb:8:in `each'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/application/railties.rb:8:in `all'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/engine.rb:423:in `load_tasks'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/application.rb:145:in `load_tasks'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/railtie/configurable.rb:30:in `method_missing'
from Rakefile:7:in `<top (required)>'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/annotate-2.4.0/lib/annotate.rb:17:in `load'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/annotate-2.4.0/lib/annotate.rb:17:in `load_tasks'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/annotate-2.4.0/bin/annotate:66:in `<top (required)>'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/bin/annotate:19:in `load'
from /Users/AM/.rvm/gems/ruby-1.9.2-p290/bin/annotate:19:in `<main>'

So feeling completely stumped.

Any ideas on how to proceed?

Thanks

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-31T02:40:56+00:00Added an answer on May 31, 2026 at 2:40 am

    Try using the updated beta version.

    gem 'annotate', '2.4.1.beta1'
    
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