Articles → MONGODB → Validations In MongoDB

Validations In MongoDB

In this article, we will discuss validations in MongoDB.

Purpose

Validations mean enforcing the rules on the data stored in the collection.

Scenario

Consider a scenario where we have a users collection. Inside the collection, we have 2 fields i.e., name and age. The rules that we want to enforce are: -

Name should be mandatory
Age should be non-negative

Creating A Collection With Validation

For creating the collection, we will use the following command: -

db.createCollection("users", {
  validator: {
    $jsonSchema: {
      bsonType: "object",
      required: ["name", "age"],
      properties: {
        name: {
          bsonType: "string",
          description: "must be a string and is required"
        },
        age: {
          bsonType: "int",
          minimum: 0,
          description: "must be a positive integer and is required"
        }
      }
    }
  }
})

Inserting Data

First, insert non-valid data in the collection.

db.users.insertOne({name:"gyan",age:-1})

Picture showing inserting the invalid data in the users table

Click to Enlarge

Insert the valid data in the collection.

db.users.insertOne({name:"gyan",age:1})

Picture showing inserting the valid data in the users table

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Friday, July 28, 2023

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