Get params inside custom validator in mongoose

Question

In my express + mongo application, I am using mongoose for database schema.

For the schema, I need a custom validator say "for checking whether length is x"

Below is my schema containing that custom validator

var schema = new Schema({ ..., contactNumber: { type: Number, validate: [ { validator: hasLength, message: "Contact number must be 10 digits", length: 10 } ] }, ... }

And below is the custom validator function:

function hasLength(str, length) { let pattern = "^d{" + length + "}$"; let regex = new RegExp(pattern, 'g'); return regex.test(str); }

In this validator function, I want to access the length parameter from the above schema.

I know this function code will not work properly. So I need help from someone that how can I access that length variable in my validator function.

Your help will be highly appreciated :)

Adam Jenkins · Accepted Answer · 2020-07-21 11:40:22Z

1

Maybe like this:

var schema = new Schema({ ..., contactNumber: { type: Number, validate: [ { validator: hasLength(10), message: "Contact number must be 10 digits", } ] }, ... } const hasLength = length => str => { let pattern = "^d{" + length + "}$"; let regex = new RegExp(pattern, 'g'); return regex.test(str); }

answered Jul 21, 2020 at 11:40

Adam Jenkins

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7 Comments

Adam Jenkins Over a year ago

you could (should?) just use the built-in validators for this, however.

Sherin Jose Over a year ago

mongoose doesn't have such a built-in validator and also i want to study how to create such a custom validator. I will try your code and let you know the result.

Adam Jenkins Over a year ago

@SherinJose You’re incorrect, they have min and max for number schemas and have minLength and maxLength validators for string schemas.

Sherin Jose Over a year ago

min and max for numbers are not for counting digits, it is the maximum number and minimum number.

Sherin Jose Over a year ago

I have checked your code and it is working fine for me. thank you @Adam

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