[{"_id":{"$oid":"60a55de5c6006332a883ffc8"},"date":{"$date":"2021-05-19T18:49:15.504Z"},"user":"Bob","movies":[{"genre":[28,80,18,53],"_id":{"$oid":"60a55b737098830015d15238"},"id":1621449587465,"title":"Heat","poster":"/obpPQskaVpSiC9RcJRB6iWDTCXS.jpg","release":"1995-12-15","ranking":3},{"genre":[28,878,18],"_id":{"$oid":"60a55b777098830015d15239"},"id":1621449591251,"title":"Snowpiercer","poster":"/nzccOvhrLGI0nvAknCEAk8bchD9.jpg","release":"2013-08-01","ranking":2},{"genre":[18,80],"_id":{"$oid":"60a55b7b7098830015d1523a"},"id":1621449595243,"title":"The Shawshank Redemption","poster":"/q6y0Go1tsGEsmtFryDOJo3dEmqu.jpg","release":"1994-09-23","ranking":1}],"__v":0},{"_id":{"$oid":"60a55de5c6006332a883ffc9"},"date":{"$date":"2021-05-19T18:49:15.504Z"},"user":"Bob2","movies":[{"genre":[28,80,18,53],"_id":{"$oid":"60a55b737098830015d15238"},"id":1621449587465,"title":"Heat","poster":"/obpPQskaVpSiC9RcJRB6iWDTCXS.jpg","release":"1995-12-15","ranking":3},{"genre":[28,878,18],"_id":{"$oid":"60a55b777098830015d15239"},"id":1621449591251,"title":"Snowpiercer","poster":"/nzccOvhrLGI0nvAknCEAk8bchD9.jpg","release":"2013-08-01","ranking":2},{"genre":[18,80],"_id":{"$oid":"60a55b7b7098830015d1523a"},"id":1621449595243,"title":"The Shawshank Redemption","poster":"/q6y0Go1tsGEsmtFryDOJo3dEmqu.jpg","release":"1994-09-23","ranking":1}],"__v":0},{"_id":{"$oid":"60a55de5c6006332a883ffc7"},"date":{"$date":"2021-05-19T18:49:15.504Z"},"user":"Bob","movies":[{"genre":[28,80,18,53],"_id":{"$oid":"60a55b737098830015d15238"},"id":1621449587465,"title":"Heat","poster":"/obpPQskaVpSiC9RcJRB6iWDTCXS.jpg","release":"1995-12-15","ranking":3},{"genre":[28,878,18],"_id":{"$oid":"60a55b777098830015d15239"},"id":1621449591251,"title":"Snowpiercer","poster":"/nzccOvhrLGI0nvAknCEAk8bchD9.jpg","release":"2013-08-01","ranking":2},{"genre":[18,80],"_id":{"$oid":"60a55b7b7098830015d1523a"},"id":1621449595243,"title":"The Shawshank Redemption","poster":"/q6y0Go1tsGEsmtFryDOJo3dEmqu.jpg","release":"1994-09-23","ranking":1}],"__v":0}]

db.collection.aggregate([{"$group":{"_id":"$user","Data":{"$addToSet":"$$ROOT"}}}])