Mongoose setting default array size and values

Question

I'm trying to setup a default array size and value in my mongoose schema, but the return is always appearing as [] unless the document actually has data.

"transform": { type: [ Number ], default: [0, 0, 0] }

Return value is:

"transform":[]

How do I configure my schema so it returns:

"transform":[0,0,0]

Answer: Setting required: true will add the data to any new documents created. Old documents will not be updated, however.

"transform": { type: [ Number ], default: [0, 0, 0], required: true }

Update To quickly resolve my data issue I ran an update on Mongo to upgrade all existing documents using the following line.

db.getCollection('objects').updateMany(
    { "properties.transform": []}, 
    { $set: { "properties.transform" : [0,0,0] }}
);

NOTE: My transform field is a child of properties hence the "properties.transform"

Is there anyway to override that? I suppose I could use 1,1,1 (just tested and it works), but it's not ideal. — roskelld
– roskelld, Commented Mar 10, 2017 at 22:15
Possible duplicate of Why doesn't my schema to add default values in mongoose arrays? — jonny
– jonny, Commented May 15, 2017 at 10:18

Remario · Accepted Answer · 2017-03-10 22:16:06Z

1

Well its either you set required to true in the schema. Or false, which defaults to empty. You can't have both ways in this case either empty or provide a value.

A hack you could use is this. Just set required to true, and upon data entry initially push array of zeroes.

model.push([0,0,0]);

answered Mar 10, 2017 at 22:16

Remario

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2 Comments

roskelld Over a year ago

Got it, I was testing on previously generated documents, I just ran an update with default set to 0 and required true, and the new documents have returned [0,0,0]

Remario Over a year ago

nice bro! previously generated documents caused it

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