How to pass an other data with value to validation in mongoose schema?

Pass an other data with value to validation function.

The following will be code for maxlength validation

maxLength = function  (v) {
    if (v && v.length) {
    return v.length <= 100;
    }
},

The schema field

desc: { type: String, validate: [maxLength, 'Exceed max length of 100 chars'] } 

Can we pass a data with validate?

i.e Like below code

desc: { type: String, validate: [maxLength, 100, 'Exceed max length of 100 chars'] } 


maxLength = function  (v, length) {
    if (v && v.length) {
    return v.length <= length;  // length will be 100
    }
},

Here validate second array element(length of desc) is passed to validation function. Later validate with this passed length.

How it can be accomplished?

[ebensing]

I think the best way to do this might be to just have a function which constructs your validator. IE.

function getMaxValidator(val) {
  return function  (v) {
    if (v && v.length) {
      return v.length <= val;
    }
  }
}
// To get a validator for length 100, you'd do something like this
...
validate : getMaxValidator(100),
...

Pretty sure this should cover your use case here. If this doesn’t work for you, let me know and we can reopen this.

[ebensing]

See the docs for how to pass custom error messages to validation functions.