ruby-on-rails - f.fields_for rails 中的 has_many 关系

Question

我有一个有很多答案的评估模型。我正在尝试构建我的 f.fields_for 但出现错误:

"undefined method `content' for <Answer::ActiveRecord_Associations_CollectionProxy:0x007fdb12041fd8>"

看法:

 <%= f.fields_for @answers do |builder| %>
   <%= builder.text_area :content, :class=>"form-control question-field", :data => {:question => question.id} %>
  <% end %>

Controller :

  def edit
    @assessment = current_user.assessments.find(params[:id])
    @answers = @assessment.answers
  end

我知道错误似乎是我在集合而不是单个对象上调用方法。但我不明白如何解决它。

Answer 1

如 f是 @assassment 的 build 者， 你可以做:

<%= f.fields_for :answers do |builder| %>
  <%= builder.text_area :content, :class=>"form-control question-field", :data => {:question => question.id} %>
<% end %>

您的 Assassement 中也需要这个模型:

class Assasement < ActiveRecord::Base
  has_many :answers
  accepts_nested_attributes_for :answers
  #...
end