r mongolite - date query

Question

Question

Using the mongolite package in R, how do you query a database for a given date?

Example Data

Answer 1

try mattjmorris's answer from github

library(GetoptLong)
datemillis <- as.integer(as.POSIXct("2015-01-01")) * 1000
data <- data_collection$find(qq('{"createdAt":{"$gt": { "$date" : { "$numberLong" : "@{datemillis}" } } } }'))

reference: https://github.com/jeroenooms/mongolite/issues/5#issuecomment-160996514

Answer 2

Prior converting your date by multiplying it with 1000, do this: options(scipen=1000), as the lack of this workaround will affect certain dates.

This is explained here:

Answer 3

@user2754799 has the correct method, but I've made a couple of small changes so that it answers my question. If they want to edit their answer with this solution I'll accept it.

d <- as.integer(as.POSIXct(strptime("2015-01-01","%Y-%m-%d"))) * 1000
## or more concisely
## d <- as.integer(as.POSIXct("2015-01-01")) * 1000
data <- mong$find(paste0('{"dte":{"$gt": { "$date" : { "$numberLong" : "', d, '" } } } }'))

Answer 4

as this question keeps showing up at the top of my google results when i forget AGAIN how to query dates in mongolite and am too lazy to go find the documentation:

the above Mongodb shell query,

db.test.find({"dte" : {"$gt" : new ISODate("2015-01-01")}})

now translates to

mong$find('{"dte":{"$gt":{"$date":"2015-01-01T00:00:00Z"}}}')

optionally, you can add millis:

mong$find('{"dte":{"$gt":{"$date":"2015-01-01T00:00:00.000Z"}}}')

if you use the wrong datetime format, you get a helpful error message pointing you to the correct format: use ISO8601 format yyyy-mm-ddThh:mm plus timezone, either "Z" or like "+0500"

of course, this is also documented in the mongolite manual