数组中元素的 Mongoid 正则表达式
我有两个模型，一个用户和一个嵌入式模型消息，
class User
include Mongoid::Document
embeds_many :messages
end
class Message
include Mongoid::Document
field :keywords, :type => Array
end
我正在尝试执行类似的操作：
u = User.last
u.messages.where(:keywords => /sometext/).first
但这不会返回任何内容，如果字段不是 Array 类型并且是 <代码>字符串。我怎样才能用 Mongoid 做这样的事情？
我还应该提到这个 Mongo 查询工作正常：
db.users.find({"messages.keywords" : /index/ })
I have two models, a User and an embedded model Message
class User
include Mongoid::Document
embeds_many :messages
end
class Message
include Mongoid::Document
field :keywords, :type => Array
end
I am trying to do something like:
u = User.last
u.messages.where(:keywords => /sometext/).first
But this returns nothing, the regex seems to work fine if the field is not of type Array and is a String. How can I do something like this with Mongoid?
I should also mention this Mongo query works fine:
db.users.find({"messages.keywords" : /index/ })
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如果你正在处理一个数组，你可以使用“in”。
如果我没记错的话应该可以。
Alex
现在您拥有了消息并且可以执行任何操作，但是您无法获取所有用户的消息集合，这样就不行了。
If you are dealing with an array, you use "in".
should work if I am not mistaken.
Alex
Now you have your messages and can do whatever, but you can't get a collections of messages for all users it does not work that way.
您的直接 Mongo 查询正在查找所有嵌入了具有指定匹配子字符串的消息的用户文档。看起来您的 Mongoid 查询的目的是在已返回的用户文档上查找匹配的消息。我不确定您正在寻找哪种行为，但如果您想在 Mongoid 中执行相同的 Mongo 直接查询，它看起来像这样：
Your direct Mongo query is finding all user documents that have embedded messages with the specified matching substring. It looks like the intention of your Mongoid query is to find a matching message on an already returned user document. I'm not sure which behavior you're looking for, but if you want to perform the same Mongo-direct query in Mongoid, it would look something like this: