meteor - MongoDB updating field contained in subdocument throws an error -

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my collection schema looks this:

products :{ _id: "s2of6hitskzwy5toz",             user_id: "lkahkhk5svtr6r8sk",             shop: "ebay.com",             items: {                     item: "hp laptop"                     item_total: 101.67                     notes: "note hp laptop"                     price: 101.67                     quantity: 1                     shop: "ebay.com"                     url: "ebay.com/hp"                     },             expenses: {                        bank_fee: 0                        cod_fee: 0                        expense_total: 0                        inbound_fee: 0                        pcs_fee: 0                        pjp_fee: 0                       },             service_fee: 15.25,             total: 116.92            }

i want update bank_fee field in expenses subdocument using update query using syntax:

insertfee : function(user_id, id, fee_amount){     products.update({user_id: user_id, _id: id}, {$set: {"expenses.$.bank_fee":fee_amount}}); }

however throws error: 

exception while invoking method 'insertfee' mongoerror: can't append array ing string field name [$]

what doing wrong here?

p.s. following this doc update operation.


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