强参数未以嵌套形式保存

Question

在我的应用中，我想创建具有name和price的事件 在这些活动中，我希望能够添加参与者，他们有一个first_name和一个salary

我将 gem Cocoon 用于嵌套表单

从 EventsController 我正在尝试创建我的参与者...

我没有找到正确的方法来做到这一点......

事件控制器

class EventsController < ApplicationController
  def new
    @event = Event.new
    @participant = Participant.new
  end

  def create
    @event = Event.create(params_event)
    if @event.save
      @event.participants.create([{first_name: params[:first_name], salary: params[:salary], event_id: params[:id]}])
      #binding.pry
      redirect_to @event
    end
  end

  def show
    @event = Event.find(params[:id])
  end

  private

  def params_event
    params
      .require(:event).permit(:name,:total_price,
        participants_attributes: [:first_name, :salary, :_destroy ] )
  end
end

我希望我的创建方法像这样在给定事件中呈现一组参与者...

@event.participants.create!([john={first_name: "John", salary: 2000, event_id: params[:id]}, mike={first_name: "Mike", salary: 1400, event_id: params[:id]}])

这是 binding.pry 的结果

 8: def create
     9:   @event = Event.create(params_event)
    10:   if @event.save
    11:   @event.participants.create([{first_name: params[:first_name], salary: params[:salary], event_id: params[:id]}])
    12:   #@event.participants.create!([john={first_name: "John",  salary: 2000, event_id: params[:id]}, mike={first_name: "Mike", salary: 1400, event_id: params[:id]}])
    13:   binding.pry
 => 14:     redirect_to @event
    15:   end
    16: end

[1] pry(#<EventsController>)>
[1] pry(#<EventsController>)> @event
=> #<Event:0x007f89f8013c98
 id: 67,
 name: "Rent a plane",
 total_price: 3400,
 created_at: Mon, 13 Mar 2017 01:18:24 UTC +00:00,
 updated_at: Mon, 13 Mar 2017 01:18:24 UTC +00:00>
[2] pry(#<EventsController>)> @event.participants
  Participant Load (0.2ms)  SELECT "participants".* FROM "participants" WHERE "participants"."event_id" = $1  [["event_id", 67]]
=> [#<Participant:0x007f89f6773580
  id: 30,
  first_name: nil,
  salary: nil,
  created_at: Mon, 13 Mar 2017 01:18:24 UTC +00:00,
  updated_at: Mon, 13 Mar 2017 01:18:24 UTC +00:00,
  event_id: 67>]

如果需要这里是我的模型：

class Event < ApplicationRecord
  has_many :participants, dependent: :destroy
  accepts_nested_attributes_for :participants, reject_if: :all_blank, allow_destroy: true
end

class Participant < ApplicationRecord
  belongs_to :event
end

还有我的表格：

new.html.erb

 <%= simple_form_for @event do |f| %>
          <%= f.input :name, label: "Event's name" %>
          <%= f.input :total_price, label: "What is the total price" %>
          <h2> Add your friends to share the bill</h2>
            <%= f.simple_fields_for :participants do |participant| %>
              <%= render "events/participants_fields", f: participant %>
            <% end %>
            <%= link_to_add_association 'add a friend', f, :participants, partial: "events/participants_fields", class:"btn btn-primary" %>
          <%= f.button :submit %>
    <% end %>

部分：_participants_fields.html.erb

<div class='nested-fields participant-background'>
  <%= f.input :first_name, label: "Enter your friend's first name" %>
  <%= f.input :salary, label: "Enter his/her monthly pay" %>
  <%= link_to_remove_association "Remove this friend", f , class: "btn btn-danger btn-xs" %>
</div>

编辑

这些是我创建与未保存参与者的事件时的日志：（我只保留了@event = Event.new(params_event)

tarted GET "/" for ::1 at 2017-03-13 13:55:20 +0100
  ActiveRecord::SchemaMigration Load (7.0ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Processing by EventsController#new as HTML
  User Load (0.6ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2  [["id", 1], ["LIMIT", 1]]
  Rendering events/new.html.erb within layouts/application
  Rendered events/_participants_fields.html.erb (5.8ms)
  Rendered events/new.html.erb within layouts/application (98.6ms)
  Rendered shared/_navbar.html.erb (2.5ms)
  Rendered shared/_flashes.html.erb (0.4ms)
Completed 200 OK in 408ms (Views: 358.0ms | ActiveRecord: 20.9ms)


Started POST "/events" for ::1 at 2017-03-13 13:55:48 +0100
Processing by EventsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"mMuWIZe06ofG6DCafY2EPrJouIcF4YzKKJx6Y9ct5XUZNHqIyvFY4l3dqiEnxC5NhQapvSnFDukgblJnHg+14g==", "event"=>{"name"=>"Rent a van", "total_price"=>"390"}, "commit"=>"Create Event"}
  User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2  [["id", 1], ["LIMIT", 1]]
   (0.1ms)  BEGIN
  SQL (11.9ms)  INSERT INTO "events" ("name", "total_price", "created_at", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id"  [["name", "Rent a van"], ["total_price", 390], ["created_at", 2017-03-13 12:55:48 UTC], ["updated_at", 2017-03-13 12:55:48 UTC]]
   (6.0ms)  COMMIT
   (0.2ms)  BEGIN
   (0.2ms)  COMMIT
Redirected to http://localhost:3000/events/93
Completed 302 Found in 25ms (ActiveRecord: 18.6ms)


Started GET "/events/93" for ::1 at 2017-03-13 13:55:48 +0100
Processing by EventsController#show as HTML
  Parameters: {"id"=>"93"}
  User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2  [["id", 1], ["LIMIT", 1]]
  Event Load (0.4ms)  SELECT  "events".* FROM "events" WHERE "events"."id" = $1 LIMIT $2  [["id", 93], ["LIMIT", 1]]
  Rendering events/show.html.erb within layouts/application
  Participant Load (0.5ms)  SELECT "participants".* FROM "participants" WHERE "participants"."event_id" = $1  [["event_id", 93]]
  Rendered events/show.html.erb within layouts/application (3.1ms)
  Rendered shared/_navbar.html.erb (3.3ms)
  Rendered shared/_flashes.html.erb (0.8ms)
Completed 200 OK in 41ms (Views: 34.1ms | ActiveRecord: 1.5ms)

Answer 1

问题出在我的表单中...... Cocoon 需要特殊的 div

<div class="container">
  <div class="col-xs-12">
    <%= simple_form_for @event do |f| %>
      <%= f.input :name, label: "Event's name" %>
      <%= f.input :total_price, label: "What is the total price" %>
      <h2> Add your friends to share the bill</h2>
        <div id="participants">
          <%= f.simple_fields_for :participants do |participant| %>
            <%= render "events/participants_fields", f: participant %>
          <% end %>
        </div>
        <div class="links">
          <%= link_to_add_association 'add a friend', f, :participants, partial: "events/participants_fields", class:"btn btn-primary" %>
        </div>
        <%= f.button :submit %>
    <% end %>
 </div>
</div>

我是这样清理控制器的：

class EventsController < ApplicationController

  def new
    @event = Event.new
  end

  def create
    @event = Event.new(params_event)
    if @event.save
      redirect_to event_path(@event)
    end
  end

  def show
    @event = Event.find(params[:id])
  end

  private

  def params_event
    params
      .require(:event).permit(:name,:total_price, participants_attributes: [:first_name, :salary, :_destroy ] )
  end
end