I have this code:
db.basket.update(
{'_id': ObjectId(data['basket_id'])},
{
'total': round(total, 2),
'$push': {
products': {
'prod_id': data['prod_id'],
'price': price,
'amount': data['amount']
}
}
}
)
Running this query gives me an error:
uncaught exception: field names cannot start with $ [$push]
Is it possible to update field in database object and push new object into array?
You needed to use $set for your single value update. Otherwise this is attempting to mix the form of update with a plain object and a "update" operator. MongoDB thinks this is just a plain object update and thus tells you that "$push" is illegal for a field name:
db.basket.update(
{'_id': ObjectId(data['basket_id'])},
{
'$set': { 'total': round(total, 2) },
'$push': {
products': {
'prod_id': data['prod_id'],
'price': price,
'amount': data['amount']
}
}
}
)
So using the correct operator here let's MongoDB know what you are trying to do and processes it correctly. Other update operators work in the same way. Only where all together.
