Email Validation with ember.js

Hi i want to set up validation if e-mail exist in db for my Ember JS aplication. The thing is that i can't call to my store right from formValidators.

formValidators: {
email: [
  {
    message: 'Please provide email in a valid format',
    validate: (inputValue) => {
      let emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
      return emailPattern.test(inputValue);
    }
  },
  {
    message: 'Email already exist',
    validate: (inputValue, self) => {
      return this.get('store').queryRecord('email',
        {
          filter: {
            email: inputValue
          }
        }).then(function () { return false })
    }
  }
]

}

When running in chrome console i get this error:

 TypeError: _this2.get is not a function(…)

I wonder that is quite easy problem, but i spent few hours and have no idea how to solve this.