Custom validation message?

[Janne Anttila]

Hi,

I'm using keystone.js v0.3.22 and I would like to have custom validation for one field. For now I have added custom validation as follows:

var keystone = require('keystone');
var Types = keystone.Field.Types;


var Foo = new keystone.List('Foo');


Foo.add({
 myField:   { type: Number, initial: true, required: true}
});


Foo.schema.path('myField').validate(function (value) {
  return false;
}, 'myField is not valid');


Foo.register();

The problem is that instead "myField is not valid", admin UI displays generic "Validation failed" error message when creating a new item. 

If I modify existing item the message is "There was an error saving your changes: Validation failed (ValidationError)"

Can I some display custom validation messages on admin UI? 

UpdateHandler seems to have way to method to add custom validator (https://github.com/keystonejs/keystone/blob/v0.3.x/lib/updateHandler.js#L39). Can I somehow use it in this context, or is the only way to write custom field type?

[Ryan Cole]

I think this is a mongoose thing right? I'd assume that errors from mongoose would bubble up to the admin UI...

[Andrés Lucas]

Maybe it's too late, but on Keystone v5, there is a hook that you can add, validateInput, where you can add the resolver data as argument and an error handle. There you can return this error with a string in order to show the error message. example:

const schema = {

 fields: {

   ...other_fields,

   projectVideo: {

     type: File,

     adapter: S3FileAdapter,

     hooks: {

       beforeChange,

       validateInput: ({ resolvedData, addFieldValidationError }) => {

         if (!resolvedData.projectVideo.mimetype.match('video/'))

           return addFieldValidationError('File must be a video file type (WEBM, MP4, etc.)')

       }

     }

   },

 hooks: {

   afterDelete

 }

}

Hope this help to anyone.