如何在编辑表单中预先填充collection_check_boxes？
GitHub回购： https ： //github.com/Yorkshireman/mywordlist
我用谷歌搜索了这个。 我确定有一种方法，可能需要一些html选项哈希中的代码，但我无法解决它。 有任何想法吗？
当访问具有一个或多个类别的Word的_edit_word_form.html.erb部分时，“类别”复选框全部未选中，要求用户再次选择它们，即使他们不想更改类别。
：title和：description的文本字段已预先填充（谢天谢地）。
_edit_word_form.html.erb：
0 %>
AND/OR...
单词/ index.html.erb的相关部分：
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
categories_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 { order("title ASC") } end
category.rb：
class Category { order("title ASC") } end
schema.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
routes.rb中：
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
讨论可能不再活跃，但我将与未来的访问者分享我的答案。
添加“{checked：@ array.map（＆：to_param）}”选项作为collection_check_boxes的最后一个参数可以解决您的问题。 请参阅此链接 。
例：
假设您有软件模型和平台（OS）模型，并且想要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，则在将数据拉出时必须将字符串转换为数组。 我用SQLite测试了它，并确认也正常工作。 有关详细信息 ，请参阅我的post
这应该更接近你想要的：
<%= b.label(class: "checkbox-inline", :"data-value" => b.value) { b.check_box + b.text } %>
尝试像这样更改_edit_word_form.html.erb
<%= form_for(@word) do |f| %> <%= f.label(:title, "Word:") %>
<%= f.text_field(:title, id: "new_word", required: true, autofocus: true, class: "form-control") %> <%= f.label(:description, "Definition:") %>
<%= f.text_area(:description, class: "form-control") %> <%= f.fields_for :category do |category_form| %> <% if current_user.word_list.categories.count > 0 %> <%= category_form.label(:title, "Choose from existing Categories:") %>
<%= 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 %> <% end %> AND/OR...
<%= category_form.label(:title, "Create and Use a New Category:") %>
<%= category_form.text_field(:title, class: "form-control") %> <% end %> <%= f.submit("Update!", class: "btn btn-block btn-primary btn-lg") %> <% end %>
因此，用户正在从单词列表中编辑单词，但是您希望显示单词列表中所有单词的所有类别的复选框，并检查附加到正在编辑的单词的那些类别。 那是对的吗？
看起来你错过了#collection_check_boxes中的第一个参数，它应该是你调用的对象：category_ids on。
如果对象是用户的word_list，那么类似于：
<%= category_form.collection_check_boxes(current_user.word_list, :category_ids, current_user.word_list.categories.all, :id, :title) do |b| %>
可能不是确切的答案 – 我无法测试它 – 但希望它能让你继续下去。
怎么了
当您在fields_for :category中调用category_form.collection_check_boxes(:category_ids, current_user.word_list.categories.all, :id, :title) ，您说@word.category上有一个名为category_ids的方法会返回ID与@word.category相关的分类。 如果在category_ids结果和current_user.word_list.categories.all都存在匹配的ID，则将选中该复选框。
我认为没有@word.category或@word.category.category_ids 。 我认为有@word.categories 。
如何解决它
话虽这么说，我的直觉告诉我你需要使用类似的东西：
<%= form_for(@word) do |f| %> <%= f.label(:title, "Word:") %>
<%= f.text_field(:title, id: "new_word", required: true, autofocus: true, class: "form-control") %> <%= f.label(:description, "Definition:") %>
<%= f.text_area(:description, class: "form-control") %> <% if current_user.word_list.categories.count > 0 %> <%= f.label(:categories, "Choose from existing Categories:") %>
<%= f.collection_check_boxes(:category_ids, current_user.word_list.categories.all, :id, :title) %> <% end %> <%= f.submit("Update!", class: "btn btn-block btn-primary btn-lg") %> <% end %>
请注意，我已将collection_check_boxes移动到@word的表单构建器，因为您希望为当前的@word构建“类别”值。 无论如何，我认为这应该朝着正确的方向迈出一步。