will paginate conflict Rails 3.1.0.rc4

Question

I am having a problem gettin my Rails 3.1.0.rc4 application running because of an error or conflict with will_paginate gem.

The error produced when I try to start the server is as follows:

/Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/will_paginate-2.3.15/lib/will_paginate.rb:39:in `enable_activerecord': uninitialized constant ActiveRecord::Associations::AssociationCollection (NameError)
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/will_paginate-2.3.15/lib/will_paginate.rb:88:in `<top (required)>'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/bundler-1.0.15/lib/bundler/runtime.rb:68:in `require'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/bundler-1.0.15/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/bundler-1.0.15/lib/bundler/runtime.rb:66:in `each'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/bundler-1.0.15/lib/bundler/runtime.rb:66:in `block in require'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/bundler-1.0.15/lib/bundler/runtime.rb:55:in `each'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/bundler-1.0.15/lib/bundler/runtime.rb:55:in `require'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/bundler-1.0.15/lib/bundler.rb:120:in `require'
    from /Users/imac/railsprojects/hbg/config/application.rb:12:in `<top (required)>'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/railties-3.1.0.rc4/lib/rails/commands.rb:52:in `require'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/railties-3.1.0.rc4/lib/rails/commands.rb:52:in `block in <top (required)>'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/railties-3.1.0.rc4/lib/rails/commands.rb:49:in `tap'
    from /Users/imac/.rvm/gems/ruby-1.9.2-p180@hbg_3.1/gems/railties-3.1.0.rc4/lib/rails/commands.rb:49:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

Answer 1

I run into the same problem. It seems that this is a known issue that will be fixed soon : https://github.com/mislav/will_paginate/issues/124

There is patch you can use in the meantime : https://github.com/p7r/will_paginate/commit/53d1da6da003dc172ee054e4cc416d0723f00b88

Or, better yet, use the following line in your Gemfile:

gem "will_paginate", :git => "https://github.com/p7r/will_paginate.git", :branch => "rails3"

Hope this answers your question.