link.rb

  def self.link(account, user, params = nil)
    found = find(:first, :conditions => { :account_id => account.to_id, :user_id => user.to_id })
    
    if (found)
      found.update_attributes!(params) if (params)
      
      found
    else
      create_params = { :account_id => account.to_id, :user_id => user.to_id }
      create_params.merge(params) if (params)

      found = create(create_params)
    end
  rescue ActiveRecord::StatementInvalid
    found = find(:first, :conditions => { :account_id => account.to_id, :user_id => user.to_id })

    found.update_attributes(params) if (params)
    
    found
  end