在rails中以逗号分隔的电子邮件列表创建多个记录(create multiple records from comma separated email list in rails)

 我对rails很新，我试图从一系列以逗号分隔的电子邮件中创建多个记录。 
 
 我正在构建简单的事件应用程序，用户可以使用单个表单向许多电子邮件发送1个邀请。 当用户创建邀请时，创建参与者记录，并且如果保存该记录，则发送邀请电子邮件。 我正在创建参与者记录而不是使用令牌系统，以便RSVP更清晰。 
 
 我无法让控制器读取并从表单中分离电子邮件。 
 
 我一直这样： 
 
undefined method `[]' for nil:NilClass
 
 这是我的代码： 
 
 我试过两个独立的控制器方法 
 
 试试1 
 
class ParticipantsController < ApplicationController
    def participant_invite
           @event = Event.find(params[:e])
           @email = params[:participant_invite][:email].split(/,\s*/)
           @participant = Participant.create!(event_id: @event.id, email: email_list,  level: 4, participant_cat_id: 3, added_by: current_user.id, status: 'unseen')
           respond_to do |format|
            if @participant.save
              format.html { redirect_to @participant, notice: 'Participant was successfully created.' }
              format.json { render :show, status: :created, location: @participant }
            else
              format.html { render :new }
              format.json { render json: @participant.errors, status: :unprocessable_entity }
            end
          end
        end
 
 试试2： 
 
def participant_invite
    @participant = params[:participant_invite][:email].split(/,\s*/)
    @participant.each do |p|
      newparticipant = Participant.new(:email => p)
      newparticipant.save
    end
    redirect_to tags_path
  end
 
 表格： 
 
<%= form_for :participant_invite, url: add_participant_path( :e => @event.id) do |f| %> 

<%=    f.email_field :email, :autofocus => true, :required => true, :maxlength => 55, :placeholder => 'Email(s)', :class => 'form-control'  %>

<%= f.submit 'Invite' %>
 
 楷模 
 
class Event < ActiveRecord::Base

    has_many :participants

end

class Participant < ActiveRecord::Base

    belongs_to :event

end
 
 追踪与放置params.inspect 
 
Started GET "/participants/participant_invite/276/1/1" for 127.0.0.1 at 2015-01-04 19:52:24 -0800
Processing by ParticipantsController#participant_invite as HTML
  Parameters: {"e"=>"276"}
  [1m[36mUser Load (0.7ms)[0m  [1mSELECT  "users".* FROM "users"  WHERE "users"."id" = 2  ORDER BY "users"."id" ASC LIMIT 1[0m

Completed 500 Internal Server Error in 57ms

NoMethodError (undefined method `[]' for nil:NilClass):
  app/controllers/participants_controller.rb:91:in `participant_invite'


  Rendered /Library/Ruby/Gems/2.0.0/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_source.erb (0.5ms)
  Rendered /Library/Ruby/Gems/2.0.0/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (0.9ms)
  Rendered /Library/Ruby/Gems/2.0.0/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (0.8ms)
  Rendered /Library/Ruby/Gems/2.0.0/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (12.1ms)
source=rack-timeout id=f896977ded104ababd4b01919c155066 timeout=10000ms service=461ms state=completed

I am fairly new to rails and am trying to create multiple records from an array of comma-separated emails.
 
I am building simple event app where the user can send 1 invitation to many emails using a single form. When the user creates an invitation a Participant record is created and , if that record is saved, an invite email is sent. I am creating the Participant record instead of using a token system so that RSVPs will be clearer.
 
I am having trouble getting the controller to read and separate the emails from the form.
 
I keep getting this:
 
undefined method `[]' for nil:NilClass
 
Here is my code:
 
I tried two separate Controller Methods
 
Try 1
 
class ParticipantsController < ApplicationController
    def participant_invite
           @event = Event.find(params[:e])
           @email = params[:participant_invite][:email].split(/,\s*/)
           @participant = Participant.create!(event_id: @event.id, email: email_list,  level: 4, participant_cat_id: 3, added_by: current_user.id, status: 'unseen')
           respond_to do |format|
            if @participant.save
              format.html { redirect_to @participant, notice: 'Participant was successfully created.' }
              format.json { render :show, status: :created, location: @participant }
            else
              format.html { render :new }
              format.json { render json: @participant.errors, status: :unprocessable_entity }
            end
          end
        end
 
Try 2:
 
def participant_invite
    @participant = params[:participant_invite][:email].split(/,\s*/)
    @participant.each do |p|
      newparticipant = Participant.new(:email => p)
      newparticipant.save
    end
    redirect_to tags_path
  end
 
The form:
 
<%= form_for :participant_invite, url: add_participant_path( :e => @event.id) do |f| %> 

<%=    f.email_field :email, :autofocus => true, :required => true, :maxlength => 55, :placeholder => 'Email(s)', :class => 'form-control'  %>

<%= f.submit 'Invite' %>
 
Models 
 
class Event < ActiveRecord::Base

    has_many :participants

end

class Participant < ActiveRecord::Base

    belongs_to :event

end
 
trace with puts params.inspect
 
Started GET "/participants/participant_invite/276/1/1" for 127.0.0.1 at 2015-01-04 19:52:24 -0800
Processing by ParticipantsController#participant_invite as HTML
  Parameters: {"e"=>"276"}
  [1m[36mUser Load (0.7ms)[0m  [1mSELECT  "users".* FROM "users"  WHERE "users"."id" = 2  ORDER BY "users"."id" ASC LIMIT 1[0m

Completed 500 Internal Server Error in 57ms

NoMethodError (undefined method `[]' for nil:NilClass):
  app/controllers/participants_controller.rb:91:in `participant_invite'


  Rendered /Library/Ruby/Gems/2.0.0/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_source.erb (0.5ms)
  Rendered /Library/Ruby/Gems/2.0.0/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (0.9ms)
  Rendered /Library/Ruby/Gems/2.0.0/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (0.8ms)
  Rendered /Library/Ruby/Gems/2.0.0/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (12.1ms)
source=rack-timeout id=f896977ded104ababd4b01919c155066 timeout=10000ms service=461ms state=completed

原文：https://stackoverflow.com/questions/27773069