Filtering with an array of objects Regex in mongodb and mongoose

Question

I'm trying to create a dynamic filter that can be implemented using at least 3 letters. I've got a lot of fields which i will be filtering against.

As an example, If I am trying to find users by email , I want to be able to type "@gma" or at least "gma" and ideally, it should return an array of all users containing the specified filtering value. This should be the same when searching for properties like firstName and so on

My current solution only works if I provide a full value that matches what I already have in my database. eg test@gmail.com for email or john for firstName . I want to be able to type jo for the latter.

const regexPattern = new RegExp(["^", filterUsersByValue, "$"].join(""), "i");
const filteredU = UserModel.find({ [filterUsersBy]: regexPattern})

Answer 1

If I've understood correctly, since you are using JS you can create the find object like this:

let findObj = {}
findObj[userKey] = {$regex:userFilter, $options:"i"}
const filteredU = UserModel.find(findObj)

This creates que object like this:

 const userFilter = "gma" const userKey = "email" let findObj = {} findObj[userKey] = {$regex:userFilter,$options:"i"} console.log(findObj)

What is the same that in this query