```ruby
class Member < ActiveRecord::Base
  belongs_to :club
  has_many :cards

  # TODO: validations
  validates :sex, :inclusion => {:in => %w(m f)}

  attr_writer :step

  def step
    @step ||= 0
  end

end
```

Revert "add step method to Member model (for multi-page form)"
user
```ruby
class Member < ActiveRecord::Base
  belongs_to :club
  has_many :cards

  # TODO: validations
  validates :sex, :inclusion => {:in => %w(m f)}
end
```
assistant