Rails 3 和 ar_extensions：未定义的方法 attribute_condition

Question

升级到 Rails 3 后，我的 Rails 应用程序中不断出现此错误。

>> u.sent_messages
NoMethodError: undefined method `attribute_condition' for #Class:0x105523f18
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/base.rb:1008:in `method_missing'
    from /Library/Ruby/Gems/1.8/gems/ar-extensions-0.9.2/lib/ar-extensions/finders.rb:79:in `sanitize_sql_from_hash'
    from /Library/Ruby/Gems/1.8/gems/ar-extensions-0.9.2/lib/ar-extensions/finders.rb:55:in `each_pair'
    from /Library/Ruby/Gems/1.8/gems/ar-extensions-0.9.2/lib/ar-extensions/finders.rb:55:in `sanitize_sql_from_hash'
    from /Library/Ruby/Gems/1.8/gems/ar-extensions-0.9.2/lib/ar-extensions/finders.rb:27:in `sanitize_sql'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/reflection.rb:131:in `send'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/reflection.rb:131:in `sanitized_conditions'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/associations/association_proxy.rb:105:in `conditions'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/associations/has_many_association.rb:103:in `construct_sql'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/associations/association_collection.rb:24:in `initialize'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/associations/has_many_association.rb:11:in `initialize'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/associations.rb:1492:in `new'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.4/lib/active_record/associations.rb:1492:in `sent_messages'
    from (irb):36
    from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.4/lib/active_support/callbacks.rb:488

结果我仍在使用 中的 ar_extensions Gem http://www.continuousthinking.com/tags/arext。一方面，他们有一个后继者，另一方面，ActiveRecord 中现在有一个批量插入选项，可能值得检查（使用 Model.create([hash1, hash2, hash3, ...])）。

Answer 1

ar-extensions 仅适用于 Rails 2.x。对于 Rails 3.x，您应该使用 activerecord-import gem。它具有相同的导入 API。

https://github.com/zdennis/activerecord-import