Mongoose - dependency in default value definition

Question

I have simple Mongoose model:

var ExampleSchema = new mongoose.Schema({
  fullHeight: {
    type: Number
  },
  partHeight: {
    type: Number
  }
});

Can I set dependency from fullHeight for partHeight parameter? Example of desired syntax is here:

var ExampleSchema = new mongoose.Schema({
  fullHeight: {
    type: Number
  },
  partHeight: {
    type: Number,
    default: fullHeight / 2
  }
});

laggingreflex · Accepted Answer · 2015-02-06 15:18:28Z

3

No, but you can setup a pre-save middleware that does this every time you save

ExampleSchema.pre('save', function(next) {
    this.partHeight = this.fullHeight / 2;
    next();
});

answered Feb 6, 2015 at 15:18

laggingreflex

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siavolt · Accepted Answer · 2015-02-06 15:19:40Z

3

var ExampleSchema = new Schema({
    fullHeight:  { type: Number, required: true },
    partHeight:  { type: Number }
});

ExampleSchema.pre('save', function(next){
    if (!this.partHeight){
        this.partHeight = this.fullHeight / 2 ;
    }
    next();
});

mongoose.model('Example', ExampleSchema);

answered Feb 6, 2015 at 15:19

siavolt

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