ruby-on-rails – has_many autosave_associated_records_for_ *

概述我正在尝试关联现有记录,同时仍然可以添加新记录.以下不起作用,但非常接近我的需要.如何完成关联现有记录和创建新记录？ has_many :comments, :through => :commentings, :source => :commentable, :source_type => "Comment"accepts_nested_attributes_for :comments, :al 我正在尝试关联现有记录,同时仍然可以添加新记录.以下不起作用,但非常接近我的需要.如何完成关联现有记录和创建新记录？

has_many :comments,:through => :commentings,:source => :commentable,:source_type => "Comment"accepts_nested_attributes_for :comments,:allow_destroy => truedef autosave_associated_records_for_comments  comments.each do |comment|    if existing_comment = Comment.find_by_fax_and_name(comment.fax,comment.name)      self.comments.reject! { |hl| hl.fax == existing_comment.fax && hl.name == existing_comment.name }      self.comments << existing_comment    else      self.comments << comment    end  endend

以下是相关的来源：https://github.com/rails/rails/blob/v3.0.11/activerecord/lib/active_record/autosave_association.rb#L155

解决方法 我已经找到了解决方案,但如果您知道更好的方法,请告诉我！

def autosave_associated_records_for_comments  existing_comments = []  new_comments = []  comments.each do |comment|    if existing_comment = Comment.find_by_fax_and_name(comment.fax,comment.name)      existing_comments << existing_comment    else      new_comments << comment    end  end  self.comments << new_comments + existing_commentsend

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