删除多余的model tag.rb

app/models/tag.rb

@@ -1,19 +0,0 @@
-class Tag < ActiveRecord::Base
-  attr_accessible :content
-#添加代码
-  has_many :projects, :through => :project_tags
-  has_many :project_tags, :class_name => 'ProjectTags'
-  
-  #确定content不会被重复写入
-  validates_uniqueness_of :content
-  validates_presence_of :content
-  
-  #添加tag内容
-  def self.add_content(content)
-    @tag=Tag.new
-    @tag.content = content
-    @tag.save
-    true
-  end
-end
-#添加结束