Mongoose array required in schema validation not working

Question

In my schema I need to have a propery that is an array that must be always not null and not undefined.

So I defined it required, but the validation is not working as I expected, because if I omit the property no error is throw.

In case of simple property (not an array) this work as I expected

const nodeSchema = new Schema({
    address: { type: String, required: true },
    outputs: { type: [String], required: true }
})

score 7 · Answer 1 · answered Sep 10 '18 at 13:25

7

I think you can fix it adding a custom validator like this:

const nodeSchema = new Schema({
    address: { type: String, required: true },
    outputs: {
      type: [String],
      required: true,
      validate: [(value) => value.length > 0, 'No outputs'],
    }
})

I hope it helps you.

answered Sep 10 '18 at 13:25

ILoveYouDrZaius

239
3
8

I think using the default = undefined is a cleaner solution – Rafael Grilli Aug 16 '23 at 23:11

score 1 · Answer 2 · answered Aug 16 '23 at 23:10

1

Just add the "default" as undefined and it will validate the array properly:

const nodeSchema = new Schema({
  address: { type: String, required: true },
  outputs: { type: [String], required: true, default: undefined },
})

answered Aug 16 '23 at 23:10

Rafael Grilli

1,959
13
25

score 0 · Answer 3 · answered May 03 '18 at 14:40

0

Arrays implicitly have a default value of [] (empty array).

This was the problem

answered May 03 '18 at 14:40

Marco24690

305
1
4
23

3

Honestly I'm not sure what is the fix? Can you share some code in your answer please? – Hazem Hagrass Sep 09 '18 at 14:19

score 0 · Answer 4 · answered Feb 17 '23 at 19:03

0

Array implicitly have a default value of [] (empty array). if you add default: undefined it will fix the issue.

answered Feb 17 '23 at 19:03

Sakib Rahman

11
4

Mongoose array required in schema validation not working

4 Answers4