How to validate number using AdonisJS

Question

I'm working on project using AdonisJS 4.1, I have a problem with validating number, here is my code in my code in the controller

const validation = await validate(request.all(), {
    posts_per_page: required|number|min:0
})

When I tried to fill the form field with any number larger than 0, it always give error message as following:

number validation failed on posts_per_page

Any help on resolving this issue will be much appreciated, thanks before.

Answer 1

The main issue here is that by default an HTML form will send all the fields as string. You need to sanitize them first using the sanitizer :

const { sanitize } = use('Validator')

const data = sanitize(request.all(), {
  posts_per_page: 'to_int',
})

Then you will be able to use data instead of request.all() for your validation.

Also, take notes that you should use request.only() instead of request.all() for security reasons.

Answer 2

The min rule evaluates the value length (ie the length of a string or an array), not the value itself. You need to user the above rule for this. Try

const validation = await validate(request.all(), {
    posts_per_page: 'required|number|above:0'
})

Answer 3

const rules = {
  posts_per_page: 'required|number|min:0'
}

const validation = await validate(request.all(), rules)