SchemaNumber

Number SchemaType 构造函数。

覆盖用于检查字符串是否通过 `required` 检查的必需验证器使用的函数。

为所有 Number 实例附加一个 getter。

示例

// Make all numbers round down
mongoose.Number.get(function(v) { return Math.floor(v); });

const Model = mongoose.model('Test', new Schema({ test: Number }));
new Model({ test: 3.14 }).test; // 3

获取/设置用于将任意值转换为数字的函数。

示例

// Make Mongoose cast empty strings '' to 0 for paths declared as numbers
const original = mongoose.Number.cast();
mongoose.Number.cast(v => {
  if (v === '') { return 0; }
  return original(v);
});

// Or disable casting entirely
mongoose.Number.cast(false);

检查给定值是否满足必需验证器。

设置枚举验证器

示例

const s = new Schema({ n: { type: Number, enum: [1, 2, 3] });
const M = db.model('M', s);

const m = new M({ n: 4 });
await m.save(); // throws validation error

m.n = 3;
await m.save(); // succeeds

设置最大数字验证器。

示例

const s = new Schema({ n: { type: Number, max: 10 })
const M = db.model('M', s)
const m = new M({ n: 11 })
m.save(function (err) {
  console.error(err) // validator error
  m.n = 10;
  m.save() // success
})

// custom error messages
// We can also use the special {MAX} token which will be replaced with the invalid value
const max = [10, 'The value of path `{PATH}` ({VALUE}) exceeds the limit ({MAX}).'];
const schema = new Schema({ n: { type: Number, max: max })
const M = mongoose.model('Measurement', schema);
const s= new M({ n: 4 });
s.validate(function (err) {
  console.log(String(err)) // ValidationError: The value of path `n` (4) exceeds the limit (10).
})

设置最小数字验证器。

示例

const s = new Schema({ n: { type: Number, min: 10 })
const M = db.model('M', s)
const m = new M({ n: 9 })
m.save(function (err) {
  console.error(err) // validator error
  m.n = 10;
  m.save() // success
})

// custom error messages
// We can also use the special {MIN} token which will be replaced with the invalid value
const min = [10, 'The value of path `{PATH}` ({VALUE}) is beneath the limit ({MIN}).'];
const schema = new Schema({ n: { type: Number, min: min })
const M = mongoose.model('Measurement', schema);
const s= new M({ n: 4 });
s.validate(function (err) {
  console.log(String(err)) // ValidationError: The value of path `n` (4) is beneath the limit (10).
})

此模式类型的名称，以防御混淆函数名称的缩小器。

为所有 Number 实例设置默认选项。

示例

// Make all numbers have option `min` equal to 0.
mongoose.Schema.Number.set('min', 0);

const Order = mongoose.model('Order', new Schema({ amount: Number }));
new Order({ amount: -10 }).validateSync().errors.amount.message; // Path `amount` must be larger than 0.