[{"_id":"5d3ac84a86688123789e13b2","name":"Puja","email":"puja@gmail.com","password":"$2a$10$r17zOU1gTJvwoB.nBdRvi.qvDmsJhIlHbp//s8l0KEKgCEvbKoZAu","location":"Delhi","createdDate":"2019-07-26T09:30:50.243Z","farm":[{"location":["11.33,22.99"],"_id":"5d3ff9d68e34cb265c030819","farmName":"Xyz","description":"Testing that info is saved ","farmAddDate":"2019-07-30T08:03:34.247Z","device":[{"_id":"5d402def7cef9f20c8272fc4","deviceName":" DeviceX01","deviceType":" Test","description":" This is a test","deviceLocation":"11.22,33.12","Parameter":" temp","Topic":"v1/ DeviceX01/11.22,33.12/ temp"}]},{"location":[],"_id":"5d42d171e7ceef2a90245470","farmName":"Xilo","description":"This is test from Postman Api Request","farmAddDate":"2019-08-01T11:48:01.883Z","device":[{"_id":"5d441878f1877637cc712d07","deviceName":"Xki","deviceType":"Muc","description":"This is test for updation of specific data in a specfic farm .Test Pass","deviceLocation":["11","180"],"Parameter":"Hello Happy","Topic":"v1/Xki/11,180/Hello Happy"},{"_id":"5d4418953968370e64c32e1f","deviceName":"Xki","deviceType":"Muc","description":"This is test for updation of specific data in a specfic farm .Test Pass","deviceLocation":["11","180"],"Parameter":"Hello Happy","Topic":"v1/Xki/11,180/Hello Happy"},{"_id":"5d4425548b3cf92af46e2c9a","deviceName":"Xki","deviceType":"Muc","description":"This is test for updation of specific data in a specfic farm .Test Pass","deviceLocation":["11","180"],"Parameter":"Hello Happy 1","Topic":"sagita/5d42d171e7ceef2a90245470/Xki/11,180/Hello Happy 1"},{"_id":"5d44256d8b3cf92af46e2c9b","deviceName":" DeviceX01","deviceType":" Test","description":" This is a test","deviceLocation":"11.22,33.12","Parameter":" set","Topic":"sagita/5d42d171e7ceef2a90245470/ DeviceX01/11.22,33.12/ set","DeviceJson":["{ \"$schema\": \"http://json-schema.org/draft-04/schema#\", \"type\": \"object\", \"properties\": { \"_id\": { \"type\": \"ObjectId\" }, \"name\": { \"type\": \"string\" }, \"email\": { \"type\": \"string\" }, \"password\": { \"type\": \"string\" }, \"location\": { \"type\": \"string\" }, \"createdDate\": { \"type\": \"Date\" }, \"farm\": { \"type\": \"array\", \"items\": [ { \"type\": \"object\", \"properties\": { \"location\": { \"type\": \"array\", \"items\": [ { \"type\": \"string\" } ] }, \"_id\": { \"type\": \"ObjectId\" }, \"farmName\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"farmAddDate\": { \"type\": \"Date\" }, \"device\": { \"type\": \"array\", \"items\": [ { \"type\": \"object\", \"properties\": { \"_id\": { \"type\": \"ObjectId\" }, \"deviceName\": { \"type\": \"string\" }, \"deviceType\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"deviceLocation\": { \"type\": \"string\" }, \"Parameter\": { \"type\": \"string\" }, \"Topic\": { \"type\": \"string\" } }, \"required\": [ \"_id\", \"deviceName\", \"deviceType\", \"description\", \"deviceLocation\", \"Parameter\", \"Topic\" ] } ] } }, \"required\": [ \"location\", \"_id\", \"farmName\", \"description\", \"farmAddDate\", \"device\" ] }, { \"type\": \"object\", \"properties\": { \"location\": { \"type\": \"array\", \"items\": {} }, \"_id\": { \"type\": \"ObjectId\" }, \"farmName\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"farmAddDate\": { \"type\": \"Date\" }, \"device\": { \"type\": \"array\", \"items\": [ { \"type\": \"object\", \"properties\": { \"_id\": { \"type\": \"ObjectId\" }, \"deviceName\": { \"type\": \"string\" }, \"deviceType\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"deviceLocation\": { \"type\": \"array\", \"items\": [ { \"type\": \"string\" }, { \"type\": \"string\" } ] }, \"Parameter\": { \"type\": \"string\" }, \"Topic\": { \"type\": \"string\" } }, \"required\": [ \"_id\", \"deviceName\", \"deviceType\", \"description\", \"deviceLocation\", \"Parameter\", \"Topic\" ] }, { \"type\": \"object\", \"properties\": { \"_id\": { \"type\": \"ObejctId\" }, \"deviceName\": { \"type\": \"string\" }, \"deviceType\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"deviceLocation\": { \"type\": \"array\", \"items\": [ { \"type\": \"string\" }, { \"type\": \"string\" } ] }, \"Parameter\": { \"type\": \"string\" }, \"Topic\": { \"type\": \"string\" } }, \"required\": [ \"_id\", \"deviceName\", \"deviceType\", \"description\", \"deviceLocation\", \"Parameter\", \"Topic\" ] }, { \"type\": \"object\", \"properties\": { \"_id\": { \"type\": \"ObjectId\" }, \"deviceName\": { \"type\": \"string\" }, \"deviceType\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"deviceLocation\": { \"type\": \"array\", \"items\": [ { \"type\": \"string\" }, { \"type\": \"string\" } ] }, \"Parameter\": { \"type\": \"string\" }, \"Topic\": { \"type\": \"string\" } }, \"required\": [ \"_id\", \"deviceName\", \"deviceType\", \"description\", \"deviceLocation\", \"Parameter\", \"Topic\" ] }, { \"type\": \"object\", \"properties\": { \"_id\": { \"type\": \"ObjectId\" }, \"deviceName\": { \"type\": \"string\" }, \"deviceType\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"deviceLocation\": { \"type\": \"string\" }, \"Parameter\": { \"type\": \"string\" }, \"Topic\": { \"type\": \"string\" }, \"DeviceJson\": { \"type\": \"array\", \"items\": [ { \"type\": \"string\" } ] } }, \"required\": [ \"_id\", \"deviceName\", \"deviceType\", \"description\", \"deviceLocation\", \"Parameter\", \"Topic\", \"DeviceJson\" ] } ] } }, \"required\": [ \"location\", \"_id\", \"farmName\", \"description\", \"farmAddDate\", \"device\" ] }, { \"type\": \"object\", \"properties\": { \"location\": { \"type\": \"array\", \"items\": [ { \"type\": \"string\" } ] }, \"_id\": { \"type\": \"ObjectId\" }, \"farmName\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"farmAddDate\": { \"type\": \"Date\" }, \"device\": { \"type\": \"array\", \"items\": [ { \"type\": \"object\", \"properties\": { \"_id\": { \"type\": \"ObjectId\" }, \"deviceName\": { \"type\": \"string\" }, \"deviceType\": { \"type\": \"string\" }, \"description\": { \"type\": \"string\" }, \"deviceLocation\": { \"type\": \"array\", \"items\": [ { \"type\": \"string\" }, { \"type\": \"string\" } ] }, \"Parameter\": { \"type\": \"string\" }, \"Topic\": { \"type\": \"string\" } }, \"required\": [ \"_id\", \"deviceName\", \"deviceType\", \"description\", \"deviceLocation\", \"Parameter\", \"Topic\" ] } ] } }, \"required\": [ \"location\", \"_id\", \"farmName\", \"description\", \"farmAddDate\", \"device\" ] } ] }, \"__v\": { \"type\": \"integer\" }, \"farmModifyDate\": { \"type\": \"Timestamp\" }, \"lastModified\": { \"type\": \"Timestamp\" }, \"deviceModifyDate\": { \"type\": \"Timestamp\" }, \"deviceModified\": { \"type\": \"Timestamp\" } }, \"required\": [ \"_id\", \"name\", \"email\", \"password\", \"location\", \"createdDate\", \"farm\", \"__v\", \"farmModifyDate\", \"lastModified\", \"deviceModifyDate\", \"deviceModified\" ] }"]}]},{"location":["11.22,65.33"],"_id":"5d492a4a1294110f64196b2d","farmName":"Durgapur","description":"This is a test for frontend to backend","farmAddDate":"2019-08-06T07:20:42.654Z","device":[{"_id":"5d4bd62900b433276c2845af","deviceName":"Farm @2 Device 001","deviceType":"Intel Edision","description":"This is a test for creation of Data Bucket of Topic","deviceLocation":["12.33","56.33"],"Parameter":"Temperature","Topic":"sagita/model/5d492a4a1294110f64196b2d/Farm @2 Device 001/12.33,56.33/Temperature"}]}],"__v":0,"lastModified":"2019-12-04T06:59:17.431Z","farmModifyDate":"6764284414131175425","deviceModifyDate":"6720517743902195713","deviceModified":"6766475118035075073"}]

db.collection.aggregate([{$match:{"farm._id":"5d3ff9d68e34cb265c030819"}},{$unwind:"$farm"},{$unwind:"$farm.device"},{$match:{"farm.device._id":"5d402def7cef9f20c8272fc4"}},{$project:{"parameter":"$farm.device.Parameter"}}])