我想提供一种方法来生成一个新的对象(“列表”)与一个新的关联对象在另一个(“项目”)使用has_many通过关系(通过“分组”)。我能够让表单正常工作,但无法弄清楚我错过了什么,以便正确完成创建过程。Rails嵌套属性与has_many通过关联不创建
Rails的诉5.1.2,红宝石诉2.4.1
lists_controller.rb
def new
@list = current_user.lists.new
3.times { @list.items.build }
end
def create
@list = current_user.lists.new(list_params)
respond_to do |format|
if @list.save
format.html { redirect_to @list, notice: 'List was successfully created.' }
format.json { render :show, status: :created, location: @list }
else
format.html { render :new }
format.json { render json: @list.errors, status: :unprocessable_entity }
end
end
end
private
def set_list
@list = List.find(params[:id])
end
def correct_user
@list = current_user.lists.find_by(id: params[:id])
redirect_to lists_path, notice: "Not authorized to edit this list"
if @list.nil?
end
def list_params
params.require(:list).permit(:title, {
item_attributes: [
:id, :title, :url
]})
end
items_controller.rb
def new
@item = Item.new
end
private
def set_item
@item = Item.find(params[:id])
end
def item_params
params.require(:item).permit(:title, :body, :url, :created,
:list_ids => [])
end
end
list.rb模型
个has_many :groupings, :dependent => :destroy
has_many :items, :through => :groupings
accepts_nested_attributes_for :items,
reject_if: ->(attrs) { attrs['title'].blank? || attrs['url'].blank? }
item.rb的模型
has_many :groupings, :dependent => :destroy
has_many :lists, :through => :groupings
validate :has_lists?
accepts_nested_attributes_for :lists
attr_writer :list_titles
after_save :assign_lists
def list_titles
@list_titles || lists.map(&:title).join(' ')
end
private
def assign_lists
if @list_titles
self.lists = @list_titles.split(/\,/).map do |title|
if title[0..0]==" "
title=title.strip
end
title=title.downcase
List.find_or_create_by_title(title)
end
end
end
def has_lists?
errors.add(:base, 'This item needs to be assigned to a list before it can be saved.') if self.lists.blank?
end
grouping.rb模型
belongs_to :item
belongs_to :list
accepts_nested_attributes_for :item, :list
词典表格
<%= form_with(model: list, local: true) do |f| %>
<% if list.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(list.errors.count, "error") %> prohibited this list from being saved:</h2>
<ul>
<% list.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :title %>
<%= f.text_field :title, id: :list_title %>
</div>
<div>
<p><strong>Items:</strong></p>
<%= f.fields_for :items do |item| %>
<div>
<%= item.label :title %>
<%= item.text_field :title %>
<%= item.label :url %>
<%= item.text_field :url %>
</div>
<% end %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
样品控制台输出
开始POST “/列表” 为127.0.0.1,在2017年9月19日十三点12分53秒-0700 处理由ListsController#创建作为HTML 参数:{ “UTF8” =>“✓”,“authenticity_token”=>“Y6rszWVUXDIVymuoBkXwvkw1pVbyC6mffiWIZzr7PVd1NT9JJi6rD72k5Fh2qU5Q5tEd0qn6bFYMSJnz2TgjAA ==”,“list”=> {“title”=>“网站”,“items_attributes”=> {“0”=> {“title”=> Google“,”url“=>”www.google.com“},”1“=> {”title“=>”Yahoo“,”url“=>”www.yahoo.com“},”2“= > {“title”=>“Bing”,“url”=>“www.bing.com”}}},“commit”=>“创建列表”} 用户负载(0.3ms)SELECT“users”。* FROM“users”WHERE“users”。“id”= $ 1 ORDER BY“users”。“id”ASC LIMIT $ 2 [[“id”,2],[“LIMIT”,1]] 不允许的参数:items_attributes (0.1ms)BEGIN SQL(0.9ms)INSERT INTO“lists”(“title”,“created_at”,“updated_at”,“user_id”)VALUES($ 1,$ 2,$ 3,$ 4) RETURNING“id”[[“title”,“Websites”],[“created_at”,“2017-09-19 20:12:53.458577”],[“updated_at”,“2017-09-19 20:12:53.458577 “],[” user_ID的”,2] (0.3ms的)COMMIT 重定向到http://localhost:3000/lists/24 完成302发现在7毫秒(ActiveRecord的:1.6毫秒)
我还在学习,清楚 - 但尝试之后这个论坛上的各种相关提示我无法弄清楚这一点。谢谢你的帮助!
这奏效了....我得到它 - 我也不得不删除验证“has_lists?”在item.rb模型中,以便使此配置有效。你太棒了。 – dstep
对,你也必须删除它。很好的接收 –