设置:
Ruby on rails 3.2.2
Ruby 1.9.2
dataMapper 1.2.0
mongoid 2.4.8
mongoid_orderable 1.0.0
获取
keys must be strings or symbols使用 mongoid_orderable 时出错。我认为这与我使用的 dataMapper 有关系，除了 mongid(使用 dataMapper 从另一个服务器移植数据)
我注意到 dataMapper 和 mongoid 之间的冲突，因为它们都使用各种方法扩展 Symbol，asc、desc 等。这可能是同一个问题吗？
如果有帮助，这是我的堆栈跟踪中的一个片段:
keys must be strings or symbols
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bson-1.6.2/lib/bson/bson_c.rb:24:in `serialize'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bson-1.6.2/lib/bson/bson_c.rb:24:in `serialize'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongo-1.6.2/lib/mongo/collection.rb:436:in `update'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongoid-2.4.8/lib/mongoid/collections/master.rb:25:in `block in update'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongoid-2.4.8/lib/mongoid/collections/retry.rb:29:in `retry_on_connection_failure'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongoid-2.4.8/lib/mongoid/collections/master.rb:24:in `update'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongoid-2.4.8/lib/mongoid/collection.rb:149:in `update'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongoid_orderable-1.0.0/lib/mongoid_orderable/mongoid/contexts/mongo.rb:6:in `inc'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongoid_orderable-1.0.0/lib/mongoid_orderable/mongoid/criteria.rb:1:in `inc'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongoid_orderable-1.0.0/lib/mongoid/orderable.rb:125:in `apply_position'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/mongoid_orderable-1.0.0/lib/mongoid/orderable.rb:85:in `add_to_list'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/callbacks.rb:419:in `block in _run__3008157942946527494__save__4591629889417243504__callbacks'
/Users/hmm/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/callbacks.rb:215:in `block in _conditional_callback_around_742'
mongoid_orderable 的当前实现如下:
class MyModel
include Mongoid::Document
include Mongoid::Orderable
default_scope order_by(:position => :asc)
end
我很确定它与基于堆栈跟踪的 _mongoid_orderable_ 相关，并且如果我注释掉 _mongoid_orderable_ 相关行，它就可以工作。还提交了一个问题 here
最佳答案
解决了。
就像我一样，它与 mongoid 和 DataMapper 发生了冲突。
更改 mongoid_orderable 中的几行解决了。
如果有人偶然发现这个问题，那是因为 DataMapper 和 Mongoid 都使用像 gte, gt, lt, lte 这样的运算符扩展 Symbol 。等等。
为了避免这种冲突，只需使用 mongoids 替代语法:
代替:
order_by(:created_at.desc)
和
where(:type.ne => 'Class')
用这个:
order_by(:created_at => :desc)
和
where(:type => {'$ne' => 'Class'})
关于ruby-on-rails - 键必须是字符串或符号，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10272452/