how to validate string size within bounds ?

[kanzaki]

Hi,

I'd like to check that a string parameter's size is between [100..250] characters long.

So far, I believe I can create a class "length"  as defined in the API docs:

class Length < Grape::Validations::Validators::Base def validate_param!(attr_name, params) unless params[attr_name].length <= @option raise Grape::Exceptions::Validation.new params: [@scope.full_name(attr_name)], message: "must be at the most #{@option} characters long" end end end

but is there a better more concise way to do it ?

params do

   requires: motto, type: String, length: 100..250

end

[Daniel D.]

This looks pretty nice and is similar to the example in https://github.com/ruby-grape/grape#custom-validators. 

I think it would be great to have this validator part of Grape if we can make it work across types, support min/max/etc. Want to give it a shot? 

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