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For example, parent model article

子模型  評(píng)論
一篇文章有許多評(píng)論，但是我發(fā)現(xiàn)評(píng)論寫錯(cuò)了 需要對(duì)評(píng)論進(jìn)行修改，這個(gè)需要如何做呢？

ParentModel

class CodeSnippet < ApplicationRecord
  has_many :annotations, dependent: :destroy
  accepts_nested_attributes_for :annotations ,update_only: true ,reject_if: :all_blank, allow_destroy: true
end

SubModel

class Annotation < ApplicationRecord
  belongs_to :code_snippet
end

Update child Model form

<%= form_for(@code_snippet) do |f| %>


    <%= f.fields_for :annotation,method: :patch do |builder| %>

        <p>
          <%= builder.label :user %><br>
          <%= builder.text_field :user %>
        </p>

        <p>
          <%= builder.label :line %><br>
          <%= builder.text_field :line %>
        </p>

        <p>
          <%= builder.label :body %><br>
          <%= builder.text_area :body %>
        </p>

        <p>
          <%= builder.submit %>
        </p>
    <% end %>
<% end %>

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