ruby-on-rails - 如何在编辑表单中预填充 collection_check_boxes？

Question

GitHub 存储库:https://github.com/Yorkshireman/mywordlist

我用谷歌搜索了这个。我确定有办法，可能需要在 html 选项哈希中添加一些代码，但我无法解决。有什么想法吗？

当访问 _edit_word_form.html.erb 部分单词时，确实有一个或多个类别，类别复选框都未选中，要求用户再次选择它们，即使他们不想更改类别。

:title 和 :description 的文本字段是预先填充的(谢天谢地)。

_edit_word_form.html.erb:

<%= form_for(@word) do %>

  <%= fields_for :word, @word do |word_form| %>
    <div class="field form-group">
      <%= word_form.label(:title, "Word:") %><br>
      <%= word_form.text_field(:title, id: "new_word", required: true, autofocus: true, class: "form-control") %>
    </div>

    <div class="field form-group">
      <%= word_form.label(:description, "Definition:") %><br>
      <%= word_form.text_area(:description, class: "form-control") %>
    </div>
  <% end %>


  <%= fields_for :category, @category do |category_form| %>
    <% if current_user.word_list.categories.count > 0 %>
      <div class="field form-group">
        <%= category_form.label(:title, "Choose from existing Categories:") %><br>
        <%= category_form.collection_check_boxes(:category_ids, current_user.word_list.categories.all, :id, :title) do |b| %>
          <%= b.label(class: "checkbox-inline") { b.check_box + b.text } %>
        <% end %>
      </div>
    <% end %>

    <h4>AND/OR...</h4>

    <div class="field form-group">
      <%= category_form.label(:title, "Create and Use a New Category:") %><br>
      <%= category_form.text_field(:title, class: "form-control") %>
    </div>
  <% end %>

  <div class="actions">
    <%= submit_tag("Update!", class: "btn btn-block btn-primary btn-lg") %>
  </div>
<% end %>

words/index.html.erb相关部分:

<% current_user.word_list.words.alphabetical_order_asc.each do |word| %>
              <tr>
                <td>
                  <%= link_to edit_word_path(word) do %>
                    <%= word.title %>
                    <span class="glyphicon glyphicon-pencil"></span>
                  <% end %>
                </td>
                <td><%= word.description %></td>
                <td>
                  <% word.categories.alphabetical_order_asc.each do |category| %>
                    <a class="btn btn-info btn-sm", role="button">
                      <%= category.title %>
                    </a>
                  <% end %>
                </td>
                <td>
                  <%= link_to word, method: :delete, data: { confirm: 'Are you sure?' } do %>
                    <span class="glyphicon glyphicon-remove"></span>
                  <% end %>
                </td>
              </tr>
            <% end %>

words_controller.rb:

class WordsController < ApplicationController
  before_action :set_word, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_user!

  # GET /words
  # GET /words.json
  def index
    @words = Word.all
    @quotes = Quote.all
  end

  # GET /words/1
  # GET /words/1.json
  def show
  end

  # GET /words/new
  def new
    @word = current_user.word_list.words.build
  end

  # GET /words/1/edit
  def edit
  end

  # POST /words
  # POST /words.json
  def create
    @word = Word.new(word_params)

    respond_to do |format|
      if @word.save
        format.html { redirect_to @word, notice: 'Word was successfully created.' }
        format.json { render :show, status: :created, location: @word }
      else
        format.html { render :new }
        format.json { render json: @word.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /words/1
  # PATCH/PUT /words/1.json
  def update
    #need to first remove categories from the word
    @word.categories.each do |category|
      @word.categories.delete category
    end

    #then push categories in from the category_params
    if params["category"].include?(:category_ids)
      (params["category"])["category_ids"].each do |i|
        next if i.to_i == 0
        @word.categories << Category.find(i.to_i) unless @word.categories.include?(Category.find(i.to_i))
      end
    end

    if category_params.include?(:title) && ((params["category"])["title"]) != ""
      @word.categories << current_user.word_list.categories.build(title: (params["category"])["title"])
    end

    respond_to do |format|
      if @word.update(word_params)
        format.html { redirect_to words_path, notice: 'Word was successfully updated.' }
        format.json { render :show, status: :ok, location: @word }
      else
        format.html { render :edit }
        format.json { render json: @word.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /words/1
  # DELETE /words/1.json
  def destroy
    @word.destroy
    respond_to do |format|
      format.html { redirect_to words_url, notice: 'Word was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_word
      @word = Word.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def word_params
      params.require(:word).permit(:title, :description, :category_ids)
    end

    def category_params
      params.require(:category).permit(:title, :category_ids, :category_id)
    end
end

类别 Controller .rb:

class CategoriesController < ApplicationController
  before_action :set_category, only: [:show, :edit, :update, :destroy]

  # GET /categories
  # GET /categories.json
  def index
    @categories = Category.all
  end

  # GET /categories/1
  # GET /categories/1.json
  def show
  end

  # GET /categories/new
  def new
    @category = current_user.word_list.categories.build
  end

  # GET /categories/1/edit
  def edit
  end

  # POST /categories
  # POST /categories.json
  def create
    @category = Category.new(category_params)

    respond_to do |format|
      if @category.save
        format.html { redirect_to @category, notice: 'Category was successfully created.' }
        format.json { render :show, status: :created, location: @category }
      else
        format.html { render :new }
        format.json { render json: @category.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /categories/1
  # PATCH/PUT /categories/1.json
  def update
    respond_to do |format|
      if @category.update(category_params)
        format.html { redirect_to @category, notice: 'Category was successfully updated.' }
        format.json { render :show, status: :ok, location: @category }
      else
        format.html { render :edit }
        format.json { render json: @category.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /categories/1
  # DELETE /categories/1.json
  def destroy
    @category.destroy
    respond_to do |format|
      format.html { redirect_to categories_url, notice: 'Category was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_category
      @category = Category.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def category_params
      params.require(:category).permit(:title, :word_list_id, :category_ids)
    end
end

word_lists_controller.rb:

class WordListsController < ApplicationController
  before_action :set_word_list, only: [:show, :edit, :update, :destroy]


  def from_category
    @selected = current_user.word_list.words.joins(:categories).where( categories: {id: (params[:category_id])} )
    respond_to do |format|
      format.js
    end
  end

  def all_words
    respond_to do |format|
      format.js
    end
  end

  # GET /word_lists
  # GET /word_lists.json
  def index
    @word_lists = WordList.all
  end

  # GET /word_lists/1
  # GET /word_lists/1.json
  def show
    @words = Word.all
    @word_list = WordList.find(params[:id])
  end

  # GET /word_lists/new
  def new
    @word_list = WordList.new
  end

  # GET /word_lists/1/edit
  def edit
  end

  # POST /word_lists
  # POST /word_lists.json
  def create
    @word_list = WordList.new(word_list_params)

    respond_to do |format|
      if @word_list.save
        format.html { redirect_to @word_list, notice: 'Word list was successfully created.' }
        format.json { render :show, status: :created, location: @word_list }
      else
        format.html { render :new }
        format.json { render json: @word_list.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /word_lists/1
  # PATCH/PUT /word_lists/1.json
  def update
    respond_to do |format|
      if @word_list.update(word_list_params)
        format.html { redirect_to @word_list, notice: 'Word list was successfully updated.' }
        format.json { render :show, status: :ok, location: @word_list }
      else
        format.html { render :edit }
        format.json { render json: @word_list.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /word_lists/1
  # DELETE /word_lists/1.json
  def destroy
    @word_list.destroy
    respond_to do |format|
      format.html { redirect_to word_lists_url, notice: 'Word list was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_word_list
      @word_list = WordList.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def word_list_params
      params[:word_list]
    end
end

word_list.rb:

class WordList < ActiveRecord::Base

    belongs_to :user

    has_many :words

    has_many :categories

end

word.rb:

class Word < ActiveRecord::Base

  belongs_to :word_list

  has_and_belongs_to_many :categories

  validates :title, presence: true

  scope :alphabetical_order_asc, -> { order("title ASC") }

end

类别.rb:

class Category < ActiveRecord::Base

    has_and_belongs_to_many :words

    belongs_to :word_list

    validates :title, presence: true

    scope :alphabetical_order_asc, -> { order("title ASC") }

end

架构.rb:

ActiveRecord::Schema.define(version: 20150609234013) do

  create_table "categories", force: :cascade do |t|
    t.string   "title"
    t.datetime "created_at",   null: false
    t.datetime "updated_at",   null: false
    t.integer  "word_list_id"
  end

  add_index "categories", ["word_list_id"], name: "index_categories_on_word_list_id"

  create_table "categories_words", id: false, force: :cascade do |t|
    t.integer "category_id"
    t.integer "word_id"
  end

  add_index "categories_words", ["category_id"], name: "index_categories_words_on_category_id"
  add_index "categories_words", ["word_id"], name: "index_categories_words_on_word_id"

  create_table "quotes", force: :cascade do |t|
    t.text     "content"
    t.string   "author"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "users", force: :cascade do |t|
    t.string   "email",                  default: "", null: false
    t.string   "encrypted_password",     default: "", null: false
    t.string   "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",          default: 0,  null: false
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
    t.datetime "created_at",                          null: false
    t.datetime "updated_at",                          null: false
  end

  add_index "users", ["email"], name: "index_users_on_email", unique: true
  add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true

  create_table "word_lists", force: :cascade do |t|
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.integer  "user_id"
  end

  create_table "words", force: :cascade do |t|
    t.string   "title"
    t.text     "description"
    t.datetime "created_at",   null: false
    t.datetime "updated_at",   null: false
    t.integer  "word_list_id"
  end

  add_index "words", ["word_list_id"], name: "index_words_on_word_list_id"

end

路线.rb:

Rails.application.routes.draw do
  resources :quotes
  resources :categories
  resources :words
  devise_for :users, controllers: { registrations: "users/registrations" }

  # The priority is based upon order of creation: first created -> highest priority.
  # See how all your routes lay out with "rake routes".

  # You can have the root of your site routed with "root"
  # root 'welcome#index'
  root 'pages#home'

  post 'create_word_and_category' => 'new_word#create_word_and_category'
end

Answer 1

讨论可能不再活跃，但我会为 future 的访问者分享我的答案。

添加“{ checked: @array.map(&:to_param) }”选项作为 collection_check_boxes 的最后一个参数可能会解决您的问题。引用这个link .

示例:
假设您有软件模型和平台 (OS) 模型，并希望选择一个或多个支持您的软件的操作系统。

#views/softwares/edit.html.erb

<%= form_for @software do |f| %>
  ...
  <%= f.label :supported_platform %>
  <%= f.collection_check_boxes(:platform_ids, @platforms, :id, :platform_name, { checked: @software.platform_ids.map(&:to_param) }) %>
  ...
  <%= f.submit "Save", class: 'btn btn-success' %>
<% end %>

注意:
@software.platform_ids 应该是一个数组。如果您使用的是 SQLite，则在提取数据时必须将字符串转换为数组。我用 SQLite 测试了它并确认它也能正常工作。参见 my post了解更多详情。