I am new to GoLang & MongoDB. I am trying to understand their relation using mgo. However , I am unable to find a suitable example on how to fetch referenced objects from mongo in Go using mgo. I have heard about populate method but no idea how mgo uses it. Can anyone throw light on the same?
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- dsgwdigu84950 2018-12-28 09:22关注
Your question is too broad, but in general if you want to fetch "referenced" object with a single query, you have to use MongoDB's Aggregation framework, specifically the lookup stage.
The aggregation framework can be used from
mgo
with theCollection.Pipe()
method.For an example, see Get a value in a reference of a lookup with MongoDB and Golang.
Some more examples:
How to get the count value using $lookup in mongodb using golang?
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