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Message from discussion besides emit() in map(), can I simply omit this map-reduce cycle?
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λq  
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 More options Jul 12 2011, 12:16 am
From: λq <lamb...@gmail.com>
Date: Tue, 12 Jul 2011 12:16:21 +0800
Local: Tues, Jul 12 2011 12:16 am
Subject: Re: [mongodb-user] besides emit() in map(), can I simply omit this map-reduce cycle?
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{
  'user': user1,
  'day': '2011-07-09'
  'top-list': [
    {'score': score1, 'date': date1, 'app': app1},
    {'score': score2, 'date': date2, 'app': app2},
    {'score': score3, 'date': date3, 'app': app3},
  ]

},

{
  'user': user1,
  'day': '2011-07-10'
  'top-list': [
    {'score': score1, 'date': date1, 'app': app1},
    {'score': score3, 'date': date3, 'app': app3},
    {'score': score4, 'date': date4, 'app': app4},
  ]
},

{
  'user': user1,
  'day': '2011-07-11'
  'top-list': [
    {'score': score3, 'date': date3, 'app': app3},
    {'score': score4, 'date': date4, 'app': app4},
    {'score': score2, 'date': date2, 'app': app2},
  ]

},

Given app3, return a result like:

{'2011-07-09': 3, '2011-07-10': 2, '2011-07-11': 1}

app3 is at rank #3 place in 2011-07-09, raised to #1 and #1 in the following
days.

But in the collection, app3 is out of the 'top-list'array, so I do not want
the mapReduce() to process this document, yes just a 'query' parameter for
mapReduce() could filter that out, but since I already need to iterate the
whole 'top-list' array in the map() function, I think I don't need 'query'
parameter?

So can I skip a number of documents for a map() ?

2011/7/12 Eliot Horowitz <eliothorow...@gmail.com>

> I'm a bit confused by what you mean.
> Is that a sample document that's in the collection?

> What would the output look like?

> 2011/7/11 λq <lamb...@gmail.com>:
> > Hi guys,
> > I knew that mapReduce() has a query parameter, but in my case,

> > {
> >   'user': user1,
> >   'top-list': [
> >     {'score': score1, 'date': date1, 'app': app1},
> >     {'score': score4, 'date': date4, 'app': app4},
> >     {'score': score3, 'date': date3, 'app': app3},
> >   ]
> > }
> > I want to use mapReduce() to find the history position change of a
> > particular my_app
> > the query parameter can do the job, but IMHO it looks redundant because
> when
> > doing the map(), I have to iterate the 'top-list' array again.
> > Is there something like pass() or omit() besides the standard emit() in
> map
> > function? So mongodb could just skip this round of map-reduce and
> continue
> > next?

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