MongoDB Update Array element -

i have document structure like

{     "_id" : objectid("52263922f5ebf05115bf550e"),     "fields" : [             {                     "field" : "lot no",                     "rules" : [ ]             },             {                     "field" : "rma no",                     "rules" : [ ]             }     ] } 

i have tried update using following code push rules array hold objects.

db.test.update({     "fields.field":{$in:["lot no"]} }, {     $addtoset: {         "fields.field.$.rules": {             'item_name': "my_item_two",             'price':1         }     } }, false, true); 

but following error can't append array using string field name [field]

how do update? have searched thru similiar posts nothing clicking. help.

you gone deep wildcard $. match item in fields array, access on that, with: fields.$. expression returns first match in fields array, reach fields fields.$.field or fields.$.result.

now, lets update update:

db.test.update({     "fields.field": "lot no" }, {     $addtoset: {         "fields.$.rules": {             'item_name': "my_item_two",             'price':1         }     } }, false, true); 

please note i've shortened query equal expression.