MapReduce for counting parameter values
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cnkt
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Published on 2010-12-27T02:56:24Z
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2010/12/27
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I have document like this:
{
"_id": ObjectId("4d17c7963ffcf60c1100002f"),
"title": "Text",
"params": {
"brand": "BMW",
"model": "i3"
}
}
{
"_id": ObjectId("4d17c7963ffcf60c1100002f"),
"title": "Text",
"params": {
"brand": "BMW",
"model": "i5"
}
}
What i need is the count of every params values. like:
brand
---------
BMW (2)
model
---------
i3 (1)
i5 (1)
I think i have to write map/reduce functions. How can i do this? Thanks.
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