```ruby
require 'csv'

module ImportTopicsHelper
  def self.define_attributes(columns)
    attributes = {}
    attributes["topic_identifier"] = columns[0].strip
    attributes["topic_name"] = columns[1].strip
    attributes["max_choosers"] = columns[2].strip
    if columns.length > 5
      attributes["category"] = columns[3].strip
      attributes["description"] = columns[4].strip
      attributes["link"] = columns[5].strip
    end
  end

  def self.create_new_sign_up_topic(attributes, session)
    sign_up_topic = SignUpTopic.new(attributes)
    sign_up_topic.assignment_id = session[:assignment_id]
    sign_up_topic.save
    # sign_up_topic
  end
end
```

Split define attributes into two methods
user
```ruby
require 'csv'

module ImportTopicsHelper
  def self.define_attributes(columns)
    attributes = {}
    attributes["topic_identifier"] = columns[0].strip
    attributes["topic_name"] = columns[1].strip
    attributes["max_choosers"] = columns[2].strip
    attributes["category"] = columns[3].strip if columns.length > 3
    define_attributes_extra(attributes,columns);
    attributes
  end

  def self.define_attributes_extra(attributes,columns)
    attributes["description"] = columns[4].strip if columns.length > 4
    attributes["link"] = columns[5].strip if columns.length > 5
    attributes
  end

  def self.create_new_sign_up_topic(attributes, session)
    sign_up_topic = SignUpTopic.new(attributes)
    sign_up_topic.assignment_id = session[:assignment_id]
    sign_up_topic.save
    # sign_up_topic
  end
end
```
assistant