write custom validation in mongoose
const breakfastSchema = new Schema({
eggs: {
type: Number,
min: [6, 'Too few eggs'],
max: 12
},
bacon: {
type: Number,
required: [true, 'Why no bacon?']
},
drink: {
type: String,
enum: ['Coffee', 'Tea'],
required: function() {
return this.bacon > 3;
}
}
});
const Breakfast = db.model('Breakfast', breakfastSchema);
const badBreakfast = new Breakfast({
eggs: 2,
bacon: 0,
drink: 'Milk'
});
let error = badBreakfast.validateSync();
assert.equal(error.errors['eggs'].message,
'Too few eggs');
assert.ok(!error.errors['bacon']);
assert.equal(error.errors['drink'].message,
'`Milk` is not a valid enum value for path `drink`.');
badBreakfast.bacon = 5;
badBreakfast.drink = null;
error = badBreakfast.validateSync();
assert.equal(error.errors['drink'].message, 'Path `drink` is required.');
badBreakfast.bacon = null;
error = badBreakfast.validateSync();
assert.equal(error.errors['bacon'].message, 'Why no bacon?');