Invite user without email + rails + devise invitable - ruby-on-rails-5

Question

I want to have a feature where I can invite any user using only their phone_number. I don't have the email address. When a user is being invited, an SMS is sent to the specified number and depending upon the contents of the reply(say, 'Y' or 'N') SMS from user, their account is confirmed/rejected. We plan to provide a link in the sms where in the user can click and enter the required details(email, name etc).
Loading development environment (Rails 5.0.2)
2.3.0 :001 > u = User.invite!(phone_number: '1234567890')
=> #<User id: nil, email: nil, first_name: nil, last_name: nil, phone_number: "1234567890", created_at: nil, updated_at: nil, invitation_token: nil, invitation_created_at: nil, invitation_sent_at: nil, invitation_accepted_at: nil, invitation_limit: nil, invited_by_type: nil, invited_by_id: nil, invitations_count: 0>
2.3.0 :002 > u.errors
=> #<ActiveModel::Errors:0x007fc91fcd4c00 #base=#<User id: nil, email: nil, first_name: nil, last_name: nil, phone_number: "1234567890", created_at: nil, updated_at: nil, invitation_token: nil, invitation_created_at: nil, invitation_sent_at: nil, invitation_accepted_at: nil, invitation_limit: nil, invited_by_type: nil, invited_by_id: nil, invitations_count: 0>, #messages={:email=>["can't be blank"]}, #details={:email=>[{:error=>:blank}]}>

Answer 1

I have same problem and i set example email for it and remove it later...
u = User.invite!(phone_number: '1234567890', email: 'example#abc.com', skip_invitation: true)
u.update(email: '')
Add this to user.rb:
def email_required?
false
end
def email_changed?
false
end