Rails的增加从模型连接表

Question

目标：找到或创建一个类别，将其添加到连接表通过饲料

修订在解析时：

has_many :category_feeds 
has_many :categories, :through => :category_feeds 

    def self.nokogiri_get_feed(url) 
    doc = Nokogiri::HTML(open(url)) 
    doc.search('feed entry').each do |item| 
     unless exists? :guid => item.css('id').text 
     categories = [] 
     item.xpath('content').each do |i| 
      i.css('subject').each do |subject| 
      name = subject['subjectname'] 
      categories << Category.find_or_create_by_name(name) 
      end 
     end 
     create!(:name => item.css('title').text, :url => item.at_css("link")[:href], :guid => item['id'], :categories => categories) 
     end 
    end 
    end 

Answer 1

categories << Category.find_or_create_by_name(name) 

我建议阅读更多在associations guide