Mongoose SchemaTypes Syntax: Array of ObjectIds

Question

Is this

blog: [{type: Schema.Types.ObjectId, ref: 'BlogEntry'}]

the same as this

blog: {type: [Schema.Types.ObjectId], ref: 'BlogEntry'}

or is the second example incorrect?

I found the second option useful because you can set a custom setter on the schema property with it. Exactly what I was looking for. — Getter Jetter
– Getter Jetter, Commented Mar 19, 2021 at 11:39

David Daza · Accepted Answer · 2017-06-08 22:08:35Z

4

Both are correct, but they're not the same. In the first one, the key blog is an array of objects. Each object contains two keys: type and ref where type is a single ObjectId and ref is already define. In the second one the key blog is no longer an array but a single object. Now, in this object the key type is an array of ObjectId.

answered Jun 8, 2017 at 22:08

David Daza

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2 Comments

White Noise Over a year ago

Thanks for the explanation. Isn't the second example better then, as the 'ref' key is redundant to be present in every single object?

David Daza Over a year ago

You're welcome and that depends of what you want for your application. But yes, with the second example you avoid the redundant.

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