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uninitialized constant ActiveRecord::Base::MysqlCompat

#4229

ruby 1.9.2-head
rails 3.0.beta1

Developing a Rails 3 application I created an initializer that loads some date from db.

...
puts "count " + StatSource.all.count.to_s

After adding this initializer when making http requests to the application I get error:

Started GET "/websites/3" for 127.0.0.1 at 2010-03-18 21:03:41

NameError (uninitialized constant ActiveRecord::Base::MysqlCompat):
  

Rendered /home/slava/.rvm/gems/ruby-1.9.2-head/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/actionpack/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.0ms)
Rendered /home/slava/.rvm/gems/ruby-1.9.2-head/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/actionpack/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (0.8ms)
Rendered /home/slava/.rvm/gems/ruby-1.9.2-head/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/actionpack/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (4.6ms)

if i comment out that line in initializer everything works, error goes away..

Reported by Slava · March 19th, 2010 @ 04:26 AM

State: new
Milestone: none
Assigned to: nobody
Importance: Low

Activity

  1. Matija Folnovic
    Matija Folnovic

    I'm getting same error, also in initializer ( seems that's initializers issue ), but in rails3.0.beta2!

    April 3rd, 2010 @ 12:16 PM

  2. xdanger (at gmail)
    xdanger (at gmail)

    I'm getting same error, also in initializer, in BETA3

    May 25th, 2010 @ 10:57 AM

  3. Neeraj Singh
    Neeraj Singh

    Looks like this is not an issue with ruby 1.8.7. I am not able to produce this error with ruby 1.8.7 and rails edge.

    ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin10.3.0]

    May 25th, 2010 @ 01:45 PM

  4. Neeraj Singh
    Neeraj Singh
    • Tag set to ruby 1.9

    May 25th, 2010 @ 01:45 PM

  5. Daniel Morris
    Daniel Morris
    • Tag changed from ruby 1.9 to rails 3.0.0.beta3, ruby 1.8.7, ruby 1.9

    I'm getting this error with 1.8.7 and rails 3 beta 3

    NameError: uninitialized constant ActiveRecord::Base::MysqlCompat

    from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb:70:in `mysql_connection'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:226:in `send'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:226:in `new_connection'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:248:in `checkout_new_connection'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `checkout'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `loop'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `checkout'
from /usr/local/rvm/rubies/ruby-1.8.7-p249/lib/ruby/1.8/monitor.rb:242:in `synchronize'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:185:in `checkout'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:99:in `connection'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:330:in `retrieve_connection'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:103:in `retrieve_connection'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:95:in `connection'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/base.rb:758:in `columns'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/persistence.rb:224:in `attributes_from_column_definition'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/locking/optimistic.rb:62:in `attributes_from_column_definition'
from /usr/local/rvm/gems/ruby-1.8.7-p249/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/base.rb:1425:in `initialize'

    May 26th, 2010 @ 02:04 PM

  6. ronin-45053 (at lighthouseapp)
    ronin-45053 (at lighthouseapp)

    I can confirm that I get this problem with both ruby 1.8.7 and 1.9.1 on Windows 7 64bit.
    I first noticed it in the rails console after reloading to see my model changes.

    C:\Users\Samuel Kadolph\My Projects\Rails\Genti>rails console
Loading development environment (Rails 3.0.0.beta3)
irb(main):001:0> u = User.new
=> #<User id: nil, type: nil, username: nil, ...snip... created_at: nil, updated_at: nil>
irb(main):002:0> u.username = "Samuel"
=> "Samuel"
irb(main):003:0> u.password = "abc123"
=> "abc123"
irb(main):004:0> u.save
=> false
irb(main):005:0> reload!
Reloading...
=> true
irb(main):006:0> u
NameError: uninitialized constant ActiveRecord::Base::MysqlCompat
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/mysql_adapter.rb:70:in `mysql_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:226:in `send'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:226:in `new_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:248:in `checkout_new_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `checkout'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `loop'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `checkout'
        from C:/Ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:185:in `checkout'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:99:in `connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:330:in `retrieve_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_specification.rb:103:in `retrieve_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_specification.rb:95:in `connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/base.rb:862:in `columns'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/base.rb:875:in `column_names'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/base.rb:1957:in `inspect'
        from C:/Ruby/lib/ruby/1.8/irb.rb:310:in `output_value'
        from C:/Ruby/lib/ruby/1.8/irb.rb:159:in `eval_input'
        from C:/Ruby/lib/ruby/1.8/irb.rb:271:in `signal_status'
        from C:/Ruby/lib/ruby/1.8/irb.rb:155:in `eval_input'
        from C:/Ruby/lib/ruby/1.8/irb.rb:154:in `eval_input'
        from C:/Ruby/lib/ruby/1.8/irb.rb:71:in `start'
        from C:/Ruby/lib/ruby/1.8/irb.rb:70:in `catch'
        from C:/Ruby/lib/ruby/1.8/irb.rb:70:in `start'
        from C:/Ruby/lib/ruby/gems/1.8/gems/railties-3.0.0.beta3/lib/rails/commands/console.rb:47:in `start'
        from C:/Ruby/lib/ruby/gems/1.8/gems/railties-3.0.0.beta3/lib/rails/commands/console.rb:8:in `start'
        from C:/Ruby/lib/ruby/gems/1.8/gems/railties-3.0.0.beta3/lib/rails/commands.rb:34
        from script/rails:9:in `require'
        from script/rails:9
irb(main):007:0> User.new
NameError: uninitialized constant ActiveRecord::Base::MysqlCompat
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/mysql_adapter.rb:70:in `mysql_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:226:in `send'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:226:in `new_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:248:in `checkout_new_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `checkout'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `loop'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `checkout'
        from C:/Ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:185:in `checkout'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:99:in `connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_pool.rb:330:in `retrieve_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_specification.rb:103:in `retrieve_connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/connection_adapters/abstract/connection_specification.rb:95:in `connection'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/base.rb:862:in `columns'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/base.rb:2105:in `attributes_from_column_definition_without_lock'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/locking/optimistic.rb:55:in `attributes_from_column_definition'
        from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta3/lib/active_record/base.rb:1525:in `initialize'
        from (irb):7:in `new'
        from (irb):7
irb(main):008:0>

    May 29th, 2010 @ 06:29 AM

  7. Jeff Kreeftmeijer
    Jeff Kreeftmeijer
    • Tag cleared.
    • Importance changed from to Low

    Automatic cleanup of spam.

    November 8th, 2010 @ 08:51 AM

  8. bingbing
    bingbing

    March 26th, 2011 @ 01:38 AM