问题描述
我是mongodb/mongomapper的新手，找不到答案.
I am new to mongodb/mongomapper and can't find an answer to this.
我有一个mongomapper类，其中包含以下字段
I have a mongomapper class with the following fields
key :author_id, Integer
key :partecipant_ids, Array
假设我有一个具有以下属性的记录":
Let's say I have a "record" with the following attributes:
{ :author_id => 10, :partecipant_ids => [10,15,201] }
我想检索ID为15的参与者所涉及的所有对象.我在文档中找不到任何提及.
I want to retrieve all the objects where the partecipant with id 15 is involved.I did not find any mention in the documentation.
奇怪的是，以前我在做这个查询
The strange thing is that previously I was doing this query
MessageThread.where :partecipant_ids => [15]
可以，但是在gem/mongodb版本中(也许)进行了一些更改之后，它停止了工作.不幸的是，我不知道以前使用的是哪个版本的mongodb和mongomapper.
which worked, but after (maybe) some change in the gem/mongodb version it stopped working.Unfortunately I don't know which version of mongodb and mongomapper I was using before.
推荐答案
在当前版本的MongoMapper中，这将起作用:
In the current versions of MongoMapper, this will work:
MessageThread.where(:partecipant_ids => 15)
这应该也可以工作...
And this should work as well...
MessageThread.where(:partecipant_ids => [15])
...因为大胆的自动将其扩展为:
...because plucky autoexpands that to:
MessageThread.where(:partecipant_ids => { :$in => [15] })
(请参见 https://github.com/jnunemaker/plucky/blob /master/lib/plucky/criteria_hash.rb#L121 )
我想说一下您的数据，并在Mongo控制台中尝试查询以确保您的查询有效. MongoDB查询直接转换为MM查询，但上述(以及其他一些次要)警告除外.参见 http://www.mongodb.org/display/DOCS/Querying
I'd say take a look at your data and try out queries in the Mongo console to make sure you have a working query. MongoDB queries translate directly to MM queries except for the above (and a few other minor) caveats. See http://www.mongodb.org/display/DOCS/Querying
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