How to validate user after a findOne method of another model

[Nafis Hasnian]

My email Authentication is almost like this example

https://github.com/strongloop/loopback-example-user-management

I just want to check the user's school and @school.edu email in my School model  

(which is given below) if it matches then it registers a user and sends email varification.

{

"name": "schools",

"base": "PersistedModel",

"idInjection": true,

"options": {

"validateUpsert": true

},

"properties": {

"School": {

"type": "string"

},

"Email": {

"type": "string",

"required": true

}

},

"validations": [],

"relations": {},

"acls": [],

"methods": {}

}