Question: How can I delete an empty array from database?

[juanpmd]

I currently have a schema definition like this:

const PeopleSchema = new SimpleSchema({
  userId: { type: String },
  interests: { type: Array, optional: true },
  'interests.$': { type: String, optional: true },
});

If the interests field comes with values, it should save the array but if the interests field is an empty array, it should not store it in the database (remove the field completely). I do this with strings perfectly but I cant get it to work with Arrays. Does anyone know how I could do this?

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[jankapunkt]

@juanpmd this should be solvable using minCount set to 1 (see minCount/maxCount) when interests is set:

const PeopleSchema = new SimpleSchema({
  userId: { type: String },
  interests: { 
    type: Array, 
    optional: true, 
    minCount () {
      if (this.isSet && this.value) {
        return 1
      }
    }
  },
  'interests.$': { type: String, optional: true },
});

[juanpmd]

Thank you @jankapunkt for your reply. Sadly this doesnt work. I tried it and I get the error message:

sanitizedError: errorClass [Error]: You must specify at least 1 values in peoples updateAsync [400]