dayofweek - How to find documents in all mondays from last 7 weeks in mongodb -

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   {     "_id" : objectid("568b650543712795bf864a45")     "companyid" : "55e2d7cfdc8f74d14f5c900f",     "timestamp" : isodate("2014-12-02t18:30:00.000z")    },    {     "_id" : objectid("568b650543712795bf864a46")     "companyid" : "55e2d7cfdc8f74d14f5c900f",     "timestamp" : isodate("2014-12-03t18:30:00.000z")  },   {     "_id" : objectid("568b650543712795bf864a47")     "companyid" : "55e2d7cfdc8f74d14f5c900f",     "timestamp" : isodate("2014-12-04t18:30:00.000z")  }

retrieve documents in mondays timestamp field last 7 weeks.

you have use mongodb aggregation framework achieve this.

find date of start (current day - 7 weeks) in whatever programming language using. have use aggregation operation $dayofweek achieve this

 var pipeline = [     {       $match: {timestamp: {$gte: startdate}}     },     {       $project: {dayofweek: {$dayofweek: '$timestamp'}}      },     {       $match: {dayofweek: 1}     }   ]; db.mycollection.aggreage(pipeline)

in above have projected 1 field, may project more fields.

for more information please click $dayofweek


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