MongoDB Aggregation: Counting distinct fields

Question

I am trying to write an aggregation to identify accounts that use multiple payment sources. Typical data would be.

{
 account:\"abc\",
 vendor:\"amazon\",
}         


        

Answer 1

db.UserModule.aggregate(
{ $group : { _id : { "companyauthemail" : "$companyauthemail", "email" : "$email" }, number : { $sum : 1 } } },
{ $group : { _id : "$_id.companyauthemail", number : { $sum : 1 } } }
);