使用 cocoon 和 checkboxes ,我不知道如何识别 checked: true 或 false in edit

using cocoon and checkboxes , I don't know how to recognize checked: true or false in edit

我是开发 rails 项目的新手,我有一个嵌套表单,用于使用 gem 'cocoon' 提交事件和票证。并且该表单有一些 check_boxes . 当你提交新的时候,没关系,但在编辑中,你不能在我的复选框中勾选。

根据下面的代码,我该怎么做?

我的错误

undefined method `include?' for nil:NilClass

  <%= f.check_box :payment_type, { multiple: true ,checked:f.object.payment_type.include?(pay), include_hidden: false }, pay %>
  <%= f.label :payment_type, pay, :value => i %>

我的模型

class Event < ActiveRecord::Base
  has_many :tickets, inverse_of: :event 
  accepts_nested_attributes_for :tickets, allow_destroy: true

class Ticket < ActiveRecord::Base
    belongs_to :event 

我的控制器

class EventsController < ApplicationController
    before_action :set_event, only: [:show, :edit, :update, :destroy]   

   def new
      @event = Event.new
    end

    def create
    @event = Event.new(event_params)
      if @event.save
          flash[:notice] = 'wow'
        redirect_to @event
      else
          flash[:notice] = 'oh..'
          render 'new'
      end
    end

    def edit
    end

    def update
        if @event.update(event_params)
        redirect_to @event
        else
        render 'edit'
        end
    end  

我的表格

<div class="nested-fields">
<h3>tickets</h3>


<div class="row formsection text-center">
    <div class="col-md-3">
    <span class="label-title">fee</span>
    </div>
    <div class="col-md-9">
    <div class='input-group'>       
    <%= f.text_field :fee, :placeholder => "fee" , :class => "form-control" %>
    </div>
    </div>   
</div>     


<div class="row formsection text-center">
    <div class="col-md-3">
    <span class="label-title">payment</span>
    </div>

    <div class="col-md-9"> 
    <%= f.hidden_field :id %>

<% payments = { 'paypal' => 1, 'credit card' => 2  } %>
<% payments.each do |pay,i| %>

<%= f.check_box :payment_type, { multiple: true ,checked: f.object.payment_type.include?(i), include_hidden: false }, i %>
<%= f.label :payment_type, pay, :value => i %>

<br>
<% end %>   

   </div>     
</div>  


<%= link_to_remove_association 'remove this', f %>
</div>

不确定为什么它在 new 上有效,但是如果 payment_type 尚未设置,并且 nil 也未设置,这将给出您显示的错误。

所以改为写这样的东西:

<%- checked_value = f.object.payment_type.present? && f.object.payment_type.include?(i) %>
<%= f.check_box :payment_type, { multiple: true ,checked: checked_value, include_hidden: false }, i %>