CODEWITHSUNDEEP
node.jsmongodbmongoosemongoose-schema
Joe
Joe

Reputation: 42627

how to have a field that conditionally MUST be null?

This isn't quite a "sometimes required" field, but a little different.

I need to have a field in a Mongoose document that, depending on other data in the document, must NEVER be populated.

Is there a way to define the schema such that if field a is populated, that field b MUST be null?

I would strongly prefer to NOT solve this with mongoose hooks...

Upvotes: 0

Views: 226

Answers (1)

salman
salman

Reputation: 314

It can be done using custom validators, this example is for mongoose version 5.x.

new Schema({
 a: {
  type: String
 },
 b: {
  type: String,
  default: null,
  validate: {
        validator: function (v) {
          if (this.a && v === null) {
            return true
          }
          return false
        },
        message: (props) => `${props.value} should be null!`
      }
 }
})

Upvotes: 1

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