Feature request: use .apply() on v-form validation rule invocations so the Vue instance can be referenced

I’m new to Vuetify, but unless I’m missing something, it doesn’t appear that I can reference the Vue instance from a validation rule function. I’d like to request a feature where v-form calls validation rules with this set to the Vue instance - it is currently the window object.

• What will it allow you to do that you can’t do today?

This will enable you to write validation rules where validation of one field depends on the value of another (for instance, “password” and “confirm password”). Also, in my case I like to suppress all errors until the form has been submitted once. Submission state is tracked on the Vue instance.

• How will it make current work-arounds straightforward?

To my knowledge there is no workaround at the moment.

[lcherone]

This way wont work:

data: () => ({
  someRule: [
    v => !!v || 'Something is required',
    v => (v && this.someValidator(v)) || 'Something invalid',
  ]
}),
methods: {
  someValidator(value) {
    // validate
  }
}

But this will:

data: function () {
  return {
    someRule: [
      v => !!v || 'Something is required',
      v => (v && this.someValidator(v)) || 'Something invalid',
    ]
  }
},
methods: {
  someValidator(value) {
    // validate
  }
}

Had me stumped for abit… I prefer data: () => ({})

[KaelWD]

With Vue 2.5, you can use a lambda for data again as it now gets passed the vm instance as an argument.