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How to store UTC time values in Mongo with Mongoid?
原标题:

The behavior I m observing with the Mongoid adapter is that it ll save time fields with the current system timezone into the database. Note that it s the system time and not Rail s environment s Time.zone. If I change the system timezone, then subsequent saves will pick up the current system timezone.

# system currently at UTC -7
@record.time_attribute = Time.now.utc
@record.save

# in mongo, the value is "time_attribute" : "Mon May 17 2010 12:00:00 GMT-0700 (QYZST)"
@record.reload.time_attribute.utc?  # false
问题回答

Try setting the use_utc mongoid config parameter to true.

It tells Mongoid that you want to return times in UTC: http://github.com/durran/mongoid/blob/master/lib/mongoid/config.rb#L22





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