Rails 4表单：复选框未将值保存到数据库

Question

我有一个带有以下 Post 模型的 Rails 4 应用程序：

create_table "posts", force: :cascade do |t|
    t.integer  "calendar_id"
    t.date     "date"
    t.time     "time"
    t.string   "subject"
    t.string   "format"
    t.text     "copy"
    t.datetime "created_at",         null: false
    t.datetime "updated_at",         null: false
    t.string   "image_file_name"
    t.string   "image_content_type"
    t.integer  "image_file_size"
    t.datetime "image_updated_at"
    t.string   "short_copy"
    t.integer  "score"
    t.boolean  "facebook"
    t.boolean  "twitter"
    t.boolean  "instagram"
    t.boolean  "pinterest"
    t.boolean  "google"
    t.boolean  "linkedin"
    t.boolean  "tumblr"
    t.boolean  "snapchat"
    t.string   "approval"
  end

必须允许用户决定post.facebook 是true 还是false，这就是:facebook 是boolean 的原因。

然后，我创建了以下表单，以允许用户实际制作post.facebook true 或false：

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

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

  <hr>

  <div class="field">
    <h3>Post details</h3>
    <p>
      <%= f.label :date %>
      <%= f.date_select :date %>
    </p>
    <p>
      <%= f.label :time %>
      <%= f.time_select :time %>
    </p>
    <p>
      <%= f.label :format %>
      <%= f.select :format, ['Simple Status', 'Image', 'Link', 'Video'] %>
    </p>
    <hr>
    <h3>Post content</h3>
    <p>
      <%= f.label :subject %>
      <%= f.text_field :subject %>
    </p>
    <p>
      <%= f.label :copy %>
      <%= f.text_area :copy %>
    </p>
    <p>
      <%= f.label :short_copy, "Short copy (Twitter only)" %>
      <%= f.text_area :short_copy %>
    </p>
    <hr>
    <h3>Social channels</h3>
    <p>
      <%= f.label_tag(:facebook, "Facebook" )%>
      <%= f.check_box_tag(:facebook) %>
    </p>
    <p>
      <%= f.label_tag(:twitter, "Twitter") %>
      <%= f.check_box_tag(:twitter) %>
    </p>
    <p>
      <%= f.label_tag(:instagram, "Instagram") %>
      <%= f.check_box_tag(:instagram) %>
    </p>
    <p>
      <%= f.label_tag(:pinterest, "Pinterest") %>
      <%= f.check_box_tag(:pinterest) %>
    </p>
    <p>
      <%= f.label_tag(:google, "Google+") %>
      <%= f.check_box_tag(:google) %>
    </p>
    <p>
      <%= f.label_tag(:linkedin, "LinkedIn") %>
      <%= f.check_box_tag(:linkedin) %>
    </p>
    <p>
      <%= f.label_tag(:tumblr, "Tumblr") %>
      <%= check_box_tag(:tumblr) %>
    </p>
    <p>
      <%= f.label_tag(:snapchat, "Snapchat") %>
      <%= f.check_box_tag(:snapchat) %>
    </p>
    <hr>
    <h3>Image</h3>
    <p>
      <%= f.label :image %><br>
      <%= f.file_field :image %>
    </p>
  </div>
  <hr>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

我确实清理了posts_controller.rb 中的所有参数：

def post_params
  params.require(:post).permit(:date, :time, :subject, :format, :copy, :image, :short_copy, :score, :facebook, :twitter, :instagram, :pinterest, :google, :linkedin, :tumblr, :snapchat, :approval)
end

问题是，每当我尝试create 新帖子或edit 现有帖子，并选中:facebook 复选框，然后保存帖子时，该值仍设置为nil。

————

更新：这是我尝试更新帖子时的服务器日志：

Started PATCH "/posts/2" for ::1 at 2015-10-16 11:13:38 -0700
Processing by PostsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"gqhmCHecVEJdqvOE18HQTEVk+jlcJ9pBi1hYJ+7GQuXHUW2VbDyZggDlCx9uKddI+iCXkd1yhrW9RWZXv4/oUw==", "post"=>{"date(1i)"=>"2015", "date(2i)"=>"9", "date(3i)"=>"22", "time(1i)"=>"2000", "time(2i)"=>"1", "time(3i)"=>"1", "time(4i)"=>"08", "time(5i)"=>"15", "format"=>"Image", "subject"=>"Yet another image test.", "copy"=>"What about it this time?", "short_copy"=>""}, "facebook"=>"1", "commit"=>"Update Post", "id"=>"2"}
  Post Load (0.1ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1  [["id", 2]]
   (0.1ms)  begin transaction
   (0.1ms)  commit transaction
Redirected to http://localhost:3000/calendars/3
Completed 302 Found in 7ms (ActiveRecord: 0.3ms)

从那里，我会说 "facebook"=>"1" 并且帖子已保存，但是当我在终端中转到 rails console 时，我仍然得到 "facebook"=>nil。

————

更新 2：这是新的服务器日志，当我使用 <%= check_box_tag(["post"]["facebook"]) %> 时：

Started PATCH "/posts/2" for ::1 at 2015-10-16 11:24:07 -0700
Processing by PostsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"ByX04ciySTvKglgJGdTGsXSIOou443o02FfPJqNSn6BC3P980xKE+5fNoJKgPMG1y8xXIzm2JsDuSvFW8hs1Fg==", "post"=>{"date(1i)"=>"2015", "date(2i)"=>"9", "date(3i)"=>"22", "time(1i)"=>"2000", "time(2i)"=>"1", "time(3i)"=>"1", "time(4i)"=>"08", "time(5i)"=>"15", "format"=>"Image", "subject"=>"Yet another image test.", "copy"=>"What about it this time?", "short_copy"=>""}, "facebook"=>"1", "commit"=>"Update Post", "id"=>"2"}
  Post Load (0.1ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1  [["id", 2]]
   (0.1ms)  begin transaction
   (0.1ms)  commit transaction
Redirected to http://localhost:3000/calendars/3
Completed 302 Found in 5ms (ActiveRecord: 0.3ms)

————

更新 3：当我使用 <%= check_box_tag("post[facebook]") %> 时，这里（再次）是一些新的服务器日志：

Started PATCH "/posts/2" for ::1 at 2015-10-16 11:31:25 -0700
Processing by PostsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"vOBGP+yXhCd9GpIbOx6+UqZCptsQcBKvfX5MM2sgvHz5GU2i9zdJ5yBVaoCC9rlWGQbLc5ElTltLY3JDOmkWyg==", "post"=>{"date(1i)"=>"2015", "date(2i)"=>"9", "date(3i)"=>"22", "time(1i)"=>"2000", "time(2i)"=>"1", "time(3i)"=>"1", "time(4i)"=>"08", "time(5i)"=>"15", "format"=>"Image", "subject"=>"Yet another image test.", "copy"=>"What about it this time?", "short_copy"=>""}, "facebook"=>"1", "commit"=>"Update Post", "id"=>"2"}
  Post Load (0.2ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1  [["id", 2]]
   (0.2ms)  begin transaction
   (0.1ms)  commit transaction
Redirected to http://localhost:3000/calendars/3
Completed 302 Found in 6ms (ActiveRecord: 0.5ms)

————

UPDATE 4：还有一些服务器日志，当我使用<%= f.checkbox :facebook %>时：

Started PATCH "/posts/2" for ::1 at 2015-10-16 11:35:32 -0700
Processing by PostsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"kl0vM/bXVM+0m9z4JD4g/HcVA5YY4NYOfGnd/YP7kjjXpCSu7XeZD+nUJGOd1if4yFFuPpm1ivpKdOON0rI4jg==", "post"=>{"date(1i)"=>"2015", "date(2i)"=>"9", "date(3i)"=>"22", "time(1i)"=>"2000", "time(2i)"=>"1", "time(3i)"=>"1", "time(4i)"=>"08", "time(5i)"=>"15", "format"=>"Image", "subject"=>"Yet another image test.", "copy"=>"What about it this time?", "short_copy"=>""}, "facebook"=>"1", "commit"=>"Update Post", "id"=>"2"}
  Post Load (0.2ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1  [["id", 2]]
   (0.2ms)  begin transaction
   (0.1ms)  commit transaction
Redirected to http://localhost:3000/calendars/3
Completed 302 Found in 9ms (ActiveRecord: 0.4ms)

————

我怎样才能得到以下行为：

• post.facebook 的默认值 => false
• :facebook 复选框的默认状态 => unchecked
• 选中:facebook 复选框时post.facebook 的值=> true
• 选中:facebook 复选框时:facebook 复选框的状态 => checked

我发现了以下 Stack Overflow 问题，但无法从那里找到解决问题的方法：

• Ruby on Rails - Checkbox not saving to database?
• Rails Checkbox not working - no error when submitting form
• Get checkbox to render as checked if boolean value is false

这似乎是一个基本要求/问题，我相信我遵循了 Rails 文档，但我无法弄清楚。

知道我错过了什么/做错了吗？

Answer 1

您的 facebook 属性不在 post 参数内。

你必须做出的改变：

<%= form_for [@calendar, @post], html: { multipart: true } do |f| %>

和

<%= f.check_box :facebook, checked: true %>

Answer 2

看起来您应该从 @crispychicken 获得所需的信息，但是由于您似乎在努力使其正常工作，因此您需要执行以下操作：

#app/controllers/posts_controller.rb
class PostsController < ApplicationController
   def new
       @calendar = Calendar.find params[:calendar_id]
       @post = @calendar.posts.new
   end

   def create
       @calendar = Calendar.find params[:calendar_id]
       @post = @calendar.posts.new post_params
       @post.save
   end

   private

   def post_params
      params.require(:post).permit(:date, :time, :subject, :format, :copy, :image, :short_copy, :score, :facebook, :twitter, :instagram, :pinterest, :google, :linkedin, :tumblr, :snapchat, :approval)
   end
end

这将允许您在表单中使用以下内容：

#app/views/posts/new.html.erb
<%= form_for [@calendar, @post] do |f| %>
    <%= f.check_box :facebook %>
<% end %>

这与您的其他代码一起应该能够创建一个新的post 并插入facebook 值。

---

一些关于你的代码的指针：

--

循环

始终使用循环或partials 来删除低效的代码。

另外，不要使用 HTML 来样式化您的应用。当您可以在其中一个 div 上轻松使用 border-top 时，您正在使用 <hr>。 <hr> 应该仅用于在您的实际内容中真正提供水平规则，不作为风格化元素。

#app/views/shared/_errors.html.erb
<%= content_tag :div, class: error_explanation do %>
   <%= content_tag :h2, "#{pluralize(@post.errors.count, "error")} prohibited this post from being saved:" %>
   <%= content_tag :ul do %>
      <%= errors.full_messages.each do |message| %>
         <%= content_tag :li, message %>
      <% end %>
   <% end %>
<% end %>

#app/views/posts/new.html.erb
<%= form_for [@calendar, @post], html: { multipart: true } do |f| %>
  <% render "errors", locals: { errors: @post.errors } if @post.errors.any? %>

  <%= content_tag :div, class: "field" do %>
    <%= content_tag :h3, "Post details" %>

    <% time = %i(date time) %>
    <% time.each do |t| %>
       <%= content_tag :p do %>
            <%= f.label :t %>
            <%= f.send("#{t}_select", t %>
       <% end %>
    <% end %>
    <%= content_tag :p do %>
      <%= f.label :format %>
      <%= f.select :format, ['Simple Status', 'Image', 'Link', 'Video'] %>
    <% end %>

    <%= content_tag :h3, "Post content" %>
    <% opts = [[:subject, "text_field"],[:copy, "text_area"]] %>
    <% opts.each do |type, field| %>
       <%= content_tag :p do %>
           <%= f.label type %>
           <%= f.send(field, type) %>
       <% end %>
    <% end %>
    <%= content_tag :p do %>
      <%= f.label :short_copy, "Short copy (Twitter only)" %>
      <%= f.text_area :short_copy %>
    <% end%>


    <% content_tag :h3, "Social channels" %>
    <% social = %i(facebook twitter instagram pinterest google linkedin tumblr snapchat) %>
    <% social.each do |s| %>
       <%= content_tag :p do %>
          <%= f.label_tag(s, s.to_s.titleize)%>
          <%= f.check_box_tag s %>
       <% end %>
    <% end %>


    <%= content_tag :h3, "Post Image" %>
    <%= content_tag :p do %>
      <%= f.label :image %>
      <%= f.file_field :image %>
    <% end %>

  <% end %>

  <%= f.submit %>
<% end %>