Logic for available issues

available_issues.rb

def get_current_available
    property = self.property
    frequency = property.frequency
    @issues = []
    @upcoming_issues = UpcomingIssue.where(:active => true)
    @upcoming_issues.each do |i|
      @issues << i.issue_month
    end
    case frequency
    when 1
      @months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
    when 2
      @months = ['January', 'March', 'May', 'July', 'September', 'November']
    when 3
      @months = ['February', 'April', 'June', 'August', 'October', 'December']
    when 4
      @months = ['January', 'April', 'July', 'October']
    when 5
      @months = ['February', 'May', 'August', 'November']
    when 6
      @months = ['March', 'June', 'September', 'December']
    end
    @final = @issues += @months
    Rails.logger.info @final
    @upcoming = @final.select{|item| @final.count(item) > 1}.uniq
    if @upcoming.size > 1
      @skip = []
      if self.property.skip_next_issue?
        @next = @upcoming.first
        @skip << @next
      end
      unless self.newsletters.where(:status => "Abandoned", :issue_year => Date.today.year).last.nil?
        @skip << self.newsletters.where(:status => "Abandoned", :issue_year => Date.today.year).last.issue_month
      end
      @complete = []
      unless self.orders.last.nil?
        @orders = self.orders.last(2)
        @orders.each do |o|
          if @upcoming.include?(o.issue_month)
            @complete << o.issue_month
          end
        end
      end
      @newfinal = @upcoming += @complete += @skip
      @newupcoming = @newfinal.select{|item| @newfinal.count(item) == 1}.uniq
      @available = UpcomingIssue.where(:active => true).find_by_issue_month(@newupcoming)
    else
      @available = UpcomingIssue.where(:active => true).find_by_issue_month(@upcoming)
    end
    return @available
  end