Devise: Create users without password

There are at least two ways to do what you want:

Method 1:

Overload Devise’s password_required? method

class User < ActiveRecord::Base
  attr_accessor :skip_password_validation  # virtual attribute to skip password validation while saving

  protected

  def password_required?
    return false if skip_password_validation
    super
  end
end

Usage:

@user.skip_password_validation = true
@user.save

Method 2:

Disable validation with validate: false option:

user.save(validate: false)

This will skip validation of all fields (not only password). In this case you should make sure that all other fields are valid.

…

But I advise you to not create users without password in your particular case. I would create some additional table (for example, invitations) and store all required information including the fields that you want to be assigned to a user after confirmation.