Mongoose: Get which condition failed in a 'find' query

Question

Is there a way to find which conditions failed in a find query.

Consider the following schema:

{
    a: String,
    b:[{
        b_id: String
      }]
}

I am searching for a record which matches 'a' and a 'b_id'. But if 'a' does not match then I have a different action to take and if 'b_id' is not found, then a different action.

Right now I am looking for a document with 'a' and then looping through the result to match for 'b_id'. This is not a efficient solution for me since the loop can easily go over tens of thousand times.

Is there a way to find out which condition failed to match or any other efficient way of doing this?

Answer 1

在mongo中，您具有可以运行的collection.find().explain()函数，它将解释所有计划以及如何构建查询，以什么顺序排列以及其他有用的信息。