Mongoose allow a key to exist only if another is set to a certain value

user_19103670 0
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I have a collection which describes requests. It looks like this:

const requestSchema = mongoose.Schema({
  status: {
    type: String,
    required: true,
    enum: ["available", "failed", "succeed"],
  },
  errorCode: { type: String , required : (when status is failed)},
});

My goal is to require errorCode only if status is set to 'failed' and don't allow it to exist otherwise. And if possible to have it removed when status is changed to 'succeed' for example. I can't quite find an answer anywhere.

mongoose node.js mongodb javascript
1 Answers

You could pass a function to required to make errorCode required only if status is equal to "failed", like so:

const requestSchema = mongoose.Schema({
  status: {
    type: String,
    required: true,
    enum: ["available", "failed", "succeed"],
  },
  errorCode: {
    type: String,
    required: function () {
      return this.status === "failed";
    },
  },
});

To remove it when status changes to "succeed", or to any other value than "failed", you can use pre method, like so:

requestSchema.pre("save", async function (next) {
  if (this.status !== "failed") { // change it as you want
    this.errorCode = "";
  }
  next();
});
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