Rails 嵌套表单仅在表单提交时传递 id答案

【问题标题】：Rails nested forms only passing the id on form submitRails 嵌套表单仅在表单提交时传递 id
【发布时间】：2016-02-15 01:08:25
【问题描述】：

不知道这里出了什么问题。从记忆中它过去工作正常，但我最近才使用该表单并意识到它在构建应用程序的过程中已停止工作。迷你测试仍然通过它，这可能意味着它是微不足道的或直接在表单上。

我正在尝试让嵌套属性value 传递来自提交

category_item 模型

  has_many :category_item_values, dependent: :destroy
  accepts_nested_attributes_for :category_item_values

  extend FriendlyId
  friendly_id :name, use: :slugged

category_item_value 模型

  belongs_to :category_item

category_items/edit.html.erb

   <%= form_for([@category, @category_item], url: category_items_update_path) do |f| %>
   <%= render 'shared/error_messages', object: f.object %>
   <%= f.fields_for :category_item_values do |item_value| %>


  <div class="value_fields">
  <%=  item_value.object.key %><br>
     <%= item_value.label :value %> 
     <%= item_value.text_field :value %>
  </div> 

    <% end %>

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

category_item 控制器

def edit

     @guide         = Guide.friendly.find(params[:guide_id])
     @category      = Category.friendly.find(params[:category_id])
     @category_item = @category.category_items.friendly.find params[:id]

end

def update


     @guide         = Guide.friendly.find(params[:guide_id])
     @category      = Category.friendly.find(params[:category_id])
     @category_item = @category.category_items.friendly.find params[:id]

    if @category_item.update (item_params)
      flash[:success] = "Updated. Thanks for contributing!"
      redirect_to category_items_show_path(@guide, @category, @category_item)
    else
      render 'edit'
    end

end

private

def item_params
   params.require(:category_item).permit(:name, category_item_values_attributes: [:id, :value])
end

提交表单时传递的参数

 Parameters: {"utf8"=>"✓", "authenticity_token"=>"O/+jbpxxY9ACV1+M7SQoYXHGvhOlgT/SufGoFpjTKaxqewnQ0IKRJWF+kxoE99DCaiKYPVkKtctSrQ0hPegIEw==", "category_item"=>{"category_item_values_attributes"=>{"0"=>{"id"=>"39"}, "1"=>{"id"=>"40"}, "2"=>{"id"=>"41"}, "3"=>{"id"=>"42"}, "4"=>{"id"=>"43"}, "5"=>{"id"=>"44"}, "6"=>{"id"=>"45"}, "7"=>{"id"=>"46"}, "8"=>{"id"=>"47"}, "9"=>{"id"=>"48"}, "10"=>{"id"=>"49"}}}, "commit"=>"Save", "guide_id"=>"dungeon-boss", "category_id"=>"heroes", "id"=>"smok"}

通过的小测试

  test "mod editing all category items successfully" do
    log_in_as(@user)
    get category_items_edit_path(@guide, @category, @category_item)
    assert_template 'category_items/edit'
    assert_select 'form.edit_category_item'
    assert CategoryItemValue.find(1).value == 'simmv' #confirm value before edit
    patch category_items_update_path(params: {key_id: 1}), category_item: { category_item_values_attributes:  [id: 1, value: "333"]}
    assert CategoryItemValue.find(1).value == '333' #confirm value changed after edit
    follow_redirect!
    assert_template 'category_items/show'
    assert_select 'div.alert'
  end

看过几次，但不知道如何让value嵌套属性从表单提交传递到参数和数据库。

categroy_item_values 架构

create_table "category_item_values", force: :cascade do |t|
    t.string   "key"
    t.integer  "key_type"
    t.text     "value"
    t.integer  "category_item_key_id"
    t.integer  "category_item_id"
    t.datetime "created_at",           null: false
    t.datetime "updated_at",           null: false
  end

*这里是加载页面然后提交表单的日志

Started GET "/guides/dungeon-boss/heroes/rock/edit" for ::1 at 2016-02-16 21:59:16 +1100
Processing by CategoryItemsController#edit as HTML
  Parameters: {"guide_id"=>"dungeon-boss", "category_id"=>"heroes", "id"=>"rock"}
  [1m[35mUser Load (0.1ms)[0m  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 1]]
  [1m[36mGuide Load (0.1ms)[0m  [1mSELECT  "guides".* FROM "guides" WHERE "guides"."slug" = ?  ORDER BY "guides"."id" ASC LIMIT 1[0m  [["slug", "dungeon-boss"]]
  [1m[35mCategory Load (0.1ms)[0m  SELECT  "categories".* FROM "categories" WHERE "categories"."slug" = ?  ORDER BY "categories"."id" ASC LIMIT 1  [["slug", "heroes"]]
  [1m[36mGameModsRelationship Exists (0.1ms)[0m  [1mSELECT  1 AS one FROM "game_mods_relationships" WHERE "game_mods_relationships"."user_id" = ? AND "game_mods_relationships"."category_id" = 7 LIMIT 1[0m  [["user_id", 1]]
  [1m[35mCategoryItem Load (0.2ms)[0m  SELECT  "category_items".* FROM "category_items" WHERE "category_items"."category_id" = ? AND "category_items"."slug" = ?  ORDER BY "category_items"."id" ASC LIMIT 1  [["category_id", 3], ["slug", "rock"]]
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT  1 AS one FROM "game_mods_relationships" WHERE "game_mods_relationships"."user_id" = ? AND "game_mods_relationships"."category_id" = 7 LIMIT 1[0m  [["user_id", 1]]
  Rendered shared/_error_messages.html.erb (0.1ms)
  [1m[35mCategoryItemValue Load (0.2ms)[0m  SELECT "category_item_values".* FROM "category_item_values" WHERE "category_item_values"."category_item_id" = ?  [["category_item_id", 10]]
  Rendered category_items/edit.html.erb within layouts/application (19.5ms)
  Rendered layouts/_shim.html.erb (0.0ms)
  Rendered layouts/_header.html.erb (0.5ms)
  Rendered layouts/_footer.html.erb (0.2ms)
Completed 200 OK in 230ms (Views: 221.2ms | ActiveRecord: 0.8ms)


Started PATCH "/guides/dungeon-boss/heroes/rock" for ::1 at 2016-02-16 21:59:21 +1100
Processing by CategoryItemsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"fT4HylfaCf9ONVlRYLKP9jP4nlerxMZoyyYJkx0mDkwsuq10Gyn7Ci0clceJYXdVKBy4eVdPTHEgeqykuB0v8w==", "category_item"=>{"category_item_values_attributes"=>{"0"=>{"id"=>"28"}, "1"=>{"id"=>"29"}, "2"=>{"id"=>"30"}, "3"=>{"id"=>"31"}, "4"=>{"id"=>"32"}, "5"=>{"id"=>"33"}, "6"=>{"id"=>"34"}, "7"=>{"id"=>"35"}, "8"=>{"id"=>"36"}, "9"=>{"id"=>"37"}, "10"=>{"id"=>"38"}, "11"=>{"id"=>"39"}, "12"=>{"id"=>"40"}, "13"=>{"id"=>"41"}, "14"=>{"id"=>"42"}, "15"=>{"id"=>"43"}, "16"=>{"id"=>"44"}, "17"=>{"id"=>"45"}, "18"=>{"id"=>"46"}, "19"=>{"id"=>"47"}, "20"=>{"id"=>"48"}, "21"=>{"id"=>"49"}, "22"=>{"id"=>"50"}, "23"=>{"id"=>"51"}, "24"=>{"id"=>"52"}, "25"=>{"id"=>"53"}, "26"=>{"id"=>"54"}, "27"=>{"id"=>"55"}, "28"=>{"id"=>"56"}, "29"=>{"id"=>"57"}}}, "commit"=>"Save", "guide_id"=>"dungeon-boss", "category_id"=>"heroes", "id"=>"rock"}
  [1m[36mUser Load (0.1ms)[0m  [1mSELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1[0m  [["id", 1]]
  [1m[35mGuide Load (0.1ms)[0m  SELECT  "guides".* FROM "guides" WHERE "guides"."slug" = ?  ORDER BY "guides"."id" ASC LIMIT 1  [["slug", "dungeon-boss"]]
  [1m[36mGameModsRelationship Exists (0.1ms)[0m  [1mSELECT  1 AS one FROM "game_mods_relationships" WHERE "game_mods_relationships"."user_id" = ? AND "game_mods_relationships"."category_id" = 7 LIMIT 1[0m  [["user_id", 1]]
  [1m[35mCategory Load (0.1ms)[0m  SELECT  "categories".* FROM "categories" WHERE "categories"."slug" = ?  ORDER BY "categories"."id" ASC LIMIT 1  [["slug", "heroes"]]
  [1m[36mCategoryItem Load (0.1ms)[0m  [1mSELECT  "category_items".* FROM "category_items" WHERE "category_items"."category_id" = ? AND "category_items"."slug" = ?  ORDER BY "category_items"."id" ASC LIMIT 1[0m  [["category_id", 3], ["slug", "rock"]]
  [1m[35mCACHE (0.0ms)[0m  SELECT  1 AS one FROM "game_mods_relationships" WHERE "game_mods_relationships"."user_id" = ? AND "game_mods_relationships"."category_id" = 7 LIMIT 1  [["user_id", 1]]
  [1m[36m (0.0ms)[0m  [1mbegin transaction[0m
  [1m[35mCategoryItemValue Load (0.3ms)[0m  SELECT "category_item_values".* FROM "category_item_values" WHERE "category_item_values"."category_item_id" = ? AND "category_item_values"."id" IN (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)  [["category_item_id", 10]]
  [1m[36mCategoryItem Exists (0.1ms)[0m  [1mSELECT  1 AS one FROM "category_items" WHERE (LOWER("category_items"."name") = LOWER('rock') AND "category_items"."id" != 10 AND "category_items"."guide_id" = 7) LIMIT 1[0m
  [1m[35m (0.0ms)[0m  commit transaction
Redirected to http://localhost:3000/guides/dungeon-boss/heroes/rock
Completed 302 Found in 16ms (ActiveRecord: 0.8ms)

似乎一切正常。此外，当我在数据库中手动给value 一个值时，它会显示在要编辑的表单输入中，因此表单似乎工作正常。就在我点击提交时，它不会将value 添加到属性参数哈希中。

日志中发生了一些事情，所以如果您认为可能导致问题的内容令人困惑，请询问（我有一个坏习惯，即假设人们知道他们看不到的随机添加的部分内容）。

【问题讨论】：

奇怪。您是否使用了与您在编辑器中查看的代码不同的版本（例如不同的 git 分支）？在您的表单中，form_for 的 <% end %> 是下一行，还是您没有向表单显示的更多内容？
以为我可能无意中从嵌套表单中删除了另一个 <% end %>，但我只是忘记将其粘贴到我的问题中。修正了问题。
category_item_values 是否存储在数据库中？还是他们只是拥有:id、:key 和:value 字段？更好的是，您可以发布category_item_values 的架构吗？
据我所见，:value 属性至少出现在params 哈希中，一切看起来都很好。除了确保您正在查看 params 哈希以获取正确的请求，并且可能只是重新启动服务器以查看是否修复了某些问题之外，我什么都没有。对不起。
谢谢。即使说你什么都没有，也意味着它很可能是我忽略的应用程序设置的一些更深层次的问题，并确认它不仅仅是一个明显的编码问题。

标签： ruby-on-rails ruby-on-rails-4 parameters controller nested-forms

【解决方案1】：

<%= form_for [@category, @category_item], url: category_items_update_path do |f| %>
   <%= render 'shared/error_messages', object: f.object %>
   <%= f.fields_for :category_item_values do |item_value| %>
     <%= item_value.object.key %>
     <%= item_value.label :value %> 
     <%= item_value.text_field :value %>
   <% end %>
   <%= f.submit "Save"%>
<% end %>

无论何时创建代码，都需要确保它是indented properly。

这个代码不错；可能的问题是您正在使用来自其他视图/操作的过时代码。如果您针对请求发布了整个控制台日志，我们可以为您提供更合适的答案。

"guide_id"=>"dungeon-boss", "category_id"=>"heroes", "id"=>"smok"

这是来自您的参数。这看起来不像category_items_update_path；也许它会帮助您识别正在使用的视图。

【讨论】：

感谢您看一看。这让我非常沮丧。我在问题中添加了页面加载和提交表单的日志。
感谢您的更新，您有git repo 我可以细读吗？
如果您有 bitbucket 用户名，我可以向您发送邀请。
我给你发了一个回购的邀请。但我警告你，我不是专业的 Rails 开发人员，而且该项目还处于早期阶段，所以那里有点乱。
没问题，让我检查一下

【解决方案2】：

在高低搜索了几天后，我设法找到了罪魁祸首是 .coffee 文件中的一些咖啡脚本编码。这个咖啡脚本使用 jquery 来更改表单 html 在页面上的排序方式，从而使表单 html 的部分变得混乱。咖啡脚本不是必需的（我只是在玩 jquery，不久前忘了摆脱编码）所以我删除了它，瞧，问题解决了。

【讨论】：