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如何在保存模型之前使用acts-as-taggable-on 格式化标签？

我在我的 ruby​​ on rails 项目中使用以下 gem

gem 'acts-as-taggable-on', '~> 2.3.1'

我已将兴趣标签添加到我的用户模型中。

用户.rb

class User < ActiveRecord::Base
  acts_as_ordered_taggable_on :interests
  scope :by_join_date, order("created_at DESC")

  rolify
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :name, :email, :password, :password_confirmation, :remember_me, :interest_list

  # this does not work
  before_save :clean_my_tags

  # this also does not work
  # before_validation :clean_my_tags

  def clean_my_tags
    if @interest_list
      # it appears that at this point, @interest_list is no longer a string, but an
      # array of strings corresponding to the tags
      @interest_list = @interest_list.map {|x| x.titleize}
    end
  end
end

假设最后一个用户已经有兴趣标签：篮球，高尔夫，足球如果我改变兴趣喜欢

u = User.last
u.interest_list = "cats, dogs, rabbits"
u.save

那么 u.interest_list 将是 ["cats", "dogs", "rabbits"]

但是，u.interests 将保留与篮球、高尔夫、足球相关的标签对象数组

如何确保在保存标签之前对标签进行格式化？

4

1 回答 1

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由于某种原因，您的before_save回调需要acts_as_taggable_on在您的模型中出现，正如 Dave 在这里指出的那样：https ://github.com/mbleigh/acts-as-taggable-on/issues/147

我确认这适用于rails（3.2）并作为可标记（2.3.3）：

class User < ActiveRecord::Base

  before_save :clean_my_tags

  acts_as_ordered_taggable_on :interests

  def clean_my_tags
    if interest_list
      interest_list = interest_list.map {|x| x.titleize}
    end
  end
end
于 2013-02-26T17:09:41.470 回答