Question

我有一个模特，一个有趣的图片。我希望能够为我的数据库中的每个pointofinterest选择一个缩略图，以便在我的网站中使用。

问题是我的单选按钮不像单选按钮组。它允许我在生成表单时选择多个单选按钮。

我尝试过使用radio_button而不是picture.radio_button，并将它们关联为一个组。我在这里错过了什么吗？

<%= f.fields_for :pictures do |picture| %>
    <% unless picture.object.new_record? %>

    <%= link_to( image_tag(picture.object.photo.url(:thumb)), picture.object.photo.url(:original) ) %>

    <div class="checkbox inline">
        <%= picture.label :destroy%>
        <%= picture.check_box :_destroy %>

        <%if :pictures[0] == picture %>
            <%= picture.label :thumbnail, :value => true%>
            <%= picture.radio_button :thumbnail, 'thumbnail', :checked => true %>
        <% else %>
            <%= picture.label :thumbnail%>
            <%= picture.radio_button :thumbnail, 'thumbnail', :checked => false %>
        <%end%>

    </div>
    <% end %>
<% end %>

编辑 - 完整_形式部分：

    <%= form_for(@pointofinterest, :html => { :multipart => true }) do |f| %>
  <% if @pointofinterest.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@pointofinterest.errors.count, "error") %> prohibited this pointofinterest from being saved:</h2>

      <ul>
      <% @pointofinterest.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %>
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :description %>
    <%= f.text_area :description %>
  </div>
  <div class="field">
    <%= f.label :latitude %>
    <%= f.text_field :latitude %>
  </div>
  <div class="field">
    <%= f.label :longitude %>
    <%= f.text_field :longitude %>
  </div>

  <div class="">
    <%= f.fields_for :pictures do |picture| %>

        <% if picture.object.new_record? %>

            <%= picture.file_field :photo %>

        <%end%>

    <% end %>
</div>

<div class="existingPaperclipFiles">
    <% @pointofinterest.pictures.each do |picture| %>
        <% unless picture.nil? %>
        <%= link_to( image_tag(picture.photo.url(:thumb)), picture.photo.url(:original) ) %>
        <div class="checkbox inline">
            <%= f.check_box :_destroy %><%= f.label :Delete%>
            <% checked = (@pointofinterest.thumbnail_id == picture.id) ? "true" : "false" %>
            <%= f.radio_button :thumbnail_id, 'thumb', :checked => checked %> <%= f.label :Thumb %>
        </div>
        <%end%>
    <% end %>
</div>

  <div class="actions">
    <%= f.submit "Submit"%>
  </div>
<% end %>

Answer 1

我认为你不需要fields_for用于此

fields_for适用于其他模型 - 我认为您希望在“父”模型中选择:thumbnail_id属性：

#app/models/point_of_interest.rb
Class PointOfInterest < ActiveRecord::Base
    has_many :pictures
    belongs_to :thumbnail, class_name: "Picture"
end

#app/models/picture.rb
Class Picture < ActiveRecord::Base
    belongs_to :point_of_interest
    has_many :points_of_interest, class_name: "PointOfInterest", foreign_key: "thumbnail_id"
end

#app/views/controller/action.html.erb
<%= @pictures.each do |picture| %>
    <%= link_to( image_tag(picture.object.photo.url(:thumb)), picture.object.photo.url(:original) ) %>

    <div class="checkbox inline">
        <%= f.label :destroy%>
        <%= f.check_box :_destroy %>

        <% checked = (@original.thumbnail_id == picture.id) ? "true" : "false" %>
        <%= f.label :thumbnail_id %>
        <%= f.radio_button :thumbnail_id, 'thumbnail', checked : checked %>
    </div>
<% end %>

Radio Button Group Form Helper Rails 4

1 个答案: