Mongoose condition queries the data of a certain time period

Today, when writing something, you need to implement a data search function , Among them, there are requirements for searching by time conditions , Write the idea of implementation here .

First , Querying by time is generally to find the data of an interval value , There are mainly the following situations ：

1. A-B Data between ;
   for example ：2020 year 6 month 1 Number of data , the truth is that 6 month 1 Number 0 Point to 6 month 2 Number 0 All data between points .
2. A Previous data ;
   for example ： Data before January , Actually less than The current time is pushed forward by one month All data of the time node .
3. A Later data
   for example ： Data within a week , Is actually greater than Push forward the current time by one week All data of the time node .

How to implement the code ？
We mainly use $gt and $lt These two operations ,$gt Is greater than a certain value ,$lt Is less than a certain value .

The specific code is as follows ：

Model.find({ createdAt: { $gt: startTime } });		// Realize the third situation 
Model.find({ createdAt: { $lt: endTime } });		// Realize the second situation 
Model.find({ $and: [{ createdAt: { $gt: startTime } }, { createdAt: { $lt: endTime } }] });		// Realize the first case 

among createdAt yes mongoose The default timestamp field when storing data in the database ,createdAt It represents the time when the data is created .startTime Indicates the start time of the query condition ,endTime It means the end time .$and It means with , It means that the following conditions are met at the same time .