[英]Mongo query that matches field to any element of array
I am trying to query a Mongo Db through R (rmongodb package). 我正在尝试通过R(rmongodb程序包)查询Mongo Db。 i have a simple requirement:
我有一个简单的要求:
I saw this response to an earlier question ( Mongo: If any array position matches single query ) and am trying along the lines: 我看到了对一个较早问题的回答( Mongo:如果任何数组位置都与单个查询匹配 ),并且正在尝试:
eids_l <- paste0("'", unique(usr$email), "'", collapse=", ")
eids_l1 <- sprintf("[ %s ]", eids_l)
q <- sprintf('{"email": {"$in": %s}}', eids_l1)
cursor <- mongo.find.all(mongo, namespace, buf)
I still get an error: 我仍然收到错误消息:
Error in mongo.bson.from.JSON(arg) :
Not a valid JSON content: {"email": {"$in": [ 'xx@gmail.com',
cursor <- mongo.find.all(mongo, "namespace", query='{ "email": { "$in": ["xx@gmail.com", "yy@gmail.com", "zz@gmail.com" ] } }')
光标<-mongo.find.all(mongo,“ namespace”,query ='{“ email”:{“ $ in”:[“ xx@gmail.com”,“ yy@gmail.com”,“ zz @ gmail .com“]}}')
Be careful with the use of apostrophes(') and quotation marks("). 请注意使用撇号(')和引号(“)。
I always use the rmongodb Cheat sheet: 我总是使用rmongodb备忘单:
https://cran.r-project.org/web/packages/rmongodb/vignettes/rmongodb_cheat_sheet.pdf https://cran.r-project.org/web/packages/rmongodb/vignettes/rmongodb_cheat_sheet.pdf
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