Custom error messages

[donpaul120]

There should be a way to set custom error messages that the default error message.

[sitegui]

Hello @donpaul120 ,

Can you give us some example of your use case, please?

I can see two paths to achieve that. The first is to redefine error messages globally, something like:

let validate = require('validate-fields')()
validate.rewriteError('I was expecting a value greater than {}', 'Gimme more! At least {}')

Or something more granular, defined at the field level, but with a big drawback of changing syntax in some non-backwards compatible manner. Like:

let validate = require('validate-fields')()
validate({
  a: {
    $type: 'uint(12)',
    $message: '{VALUE} is less than {1}. {PATH} demands change!'
  }
}, {a: 2})
validate.lastError = '2 is less than 12. a demands change!'

The second approach introduces a lot of space for future extensions.

[donpaul120]

Sorry i'm a bit late..
Hmmmm... The second approach best fits my use case..

class model{
   constructor(){
    }

   rules(){
      return {
          name:String,
       };
   }
}

class modelService{
   createModel(data){
     let model = new Model(data);
     let isValid = validate(model.rules(), model);
      if(!isValid) return Promise.rejects(Util.buildApiResponse('fail', {message:validate.lastError}));
     .....
    }
}

So i wanted to have a custom error message than sticking to the defacto.
But it seems option 2 that you provided seems to be a perfect fix for me so i can define everything in my model.