Question

我正在尝试创建一个电子邮件记录，可以将其保存为不同的类型。例如，将发送给所有用户的电子邮件，或仅发送给某些作者的电子邮件。

除了编写者之外，每个选项都有效，我试图使用复选框来保存id数组，而不是从数据库中检索id数组。

class Email < ActiveRecord::Base
  validates_presence_of :subject, :body
  serialize :user_ids
  after_create :set_user_ids

  ...

  private

  def set_user_ids
    if mass_email?
      array = User.pluck(:id)
    elsif user_email?
      ...
    end
    self.user_ids ||= array
    self.max_mailings = user_ids.size
    save!
  end
end

表单（使用simple_form）：

<%= simple_form_for [:admin, @email] do |f| %>
  <% if writers?(params[:email_type]) %>
    <%= f.input :sent_to, as: :hidden, input_html: { value: "Writers" } %>
    <%= f.input :user_ids, collection: Writer.all.collect{ |w| [w.name, w.id] }, as: :check_boxes, label: false %>
    <br>
  <% end %>

  ...
<% end %>

html：

<form accept-charset="UTF-8" action="/admin/emails" class="simple_form new_email" id="new_email" method="post" novalidate="novalidate">
  ...
  <div class="control-group check_boxes optional email_user_ids">
    <div class="controls">
      <label class="checkbox">
        <input class="check_boxes optional" id="email_user_ids_1" name="email[user_ids][]" type="checkbox" value="1" />
        John Smith
      </label>
      <label class="checkbox">
        <input class="check_boxes optional" id="email_user_ids_2" name="email[user_ids][]" type="checkbox" value="2" />
        Bob Brown
      </label>
      <input name="email[user_ids][]" type="hidden" value="" />
    </div>
  </div>

通常的new和create操作：

class Admin::EmailsController < ApplicationController
  def new
    @email = Email.new
  end

  def create
    @email = Email.new(email_params)
    if @email.save
      flash[:success] = "Email saved successfully."
      redirect_to [:admin, @email]
    else
      render 'new'
    end
  end

  private

  def email_params
    params.require(:email).permit(:subject, :body, :email_type, :user_ids, :max_mailings, :sent_to)
  end
end

但是当我尝试提交以下错误时，即使存在user_ids参数：

undefined method 'size' for nil:NilClass
Extracted source (around line #51):

49  end
50    self.user_ids ||= array
51    self.max_mailings = user_ids.size
52    save!
53  end

Parameters:

{"utf8"=>"✓",
 "authenticity_token"=>"cVyUQY7Faqr6JpkdGoPwLhe+Pv6ld/7vzXLvBg+tzsk=",
 "email"=>{"sent_to"=>"Writers",
 "user_ids"=>["1",
 "2",
 ""],
 "subject"=>"Email to writers",
 "body"=>"Email to writers",
 "email_type"=>"writers"},
 "commit"=>"Create Email"}

我无法弄清楚为什么user_ids未正确更新此外，我不确定为什么额外的email[users_id][]字段会呈现为隐藏字段。

Answer 1

我相信您的问题可能在于您的email_params方法。查看how to permit an array with strong parameters。看起来您可能需要明确声明user_ids将是一个数组。

通过表单无法正常工作来保存数组（使用复选框和simple_form）

1 个答案: