ruby-on-rails - Actionmailer でのメールの NoMethodError

Question

購入確認の NoMethodError です。ここで何が欠けているのかわかりません。
/purchases での NoMethodError nil:NilClass の未定義のメソッド「email」

purchase_confirmationapp/mailers/purchase_mailer.rb

     #   en.purchase_mailer.purchase_confirmation.subject
8   #
9   def purchase_confirmation(purchase)
10     @greeting = "Hi"
11     
12     mail to: purchase.email, subject: "Purchase Confirmation"
13   end
14 end


createapp/controllers/purchases_controller.rb

1 class PurchasesController < InheritedResources::Base
2 before_filter :authenticate_admin_user!, :only => [:index, :edit, :update, :destroy]
3         def create
4                 @purchase = Purchase.new(params[:purchase])
5   if @purchase.save
6           PurchaseMailer.purchase_confirmation(@purchase).deliver
7   redirect_to "/thankyou"
8 else
9 
10   render :action => "new"
11 end

何かアドバイス？

@ 記号を編集して削除した後、@purchase を purchase に変更すると、このエラーが表示されるようになりました

    _app_views_purchase_mailer_purchase_confirmation_text_erb

1 <%= @email.purchase %>
2 
3 <%= @greeting %>, thanks for your purchase! We're on it! 

    purchase_confirmationapp/mailers/purchase_mailer.rb

7   #   en.purchase_mailer.purchase_confirmation.subject
8   #
9   def purchase_confirmation(purchase)
 10     @greeting = "Hi"
 11     
 12     mail to: purchase.email, subject: "Purchase Confirmation"
 13   end
 14 end

    createapp/controllers/purchases_controller.rb
1 class PurchasesController < InheritedResources::Base
2 before_filter :authenticate_admin_user!, :only => [:index, :edit, :update, :destroy]
3         def create
4                 @purchase = Purchase.new(params[:purchase])
5   if @purchase.save
6           PurchaseMailer.purchase_confirmation(@purchase).deliver
7   redirect_to "/thankyou"
8 else
9 
 10   render :action => "new"
 11 end

    Rendered purchase_mailer/purchase_confirmation.text.erb (2.1ms)

176 ミリ秒で 500 内部サーバー エラーを完了

>>NoMethodError - undefined method `purchase' for nil:NilClass:
  app/views/purchase_mailer/purchase_confirmation.text.erb:1:in `_app_views_purchase_mailer_purchase_confirmation_text_erb___3663910894988497772_70151297381080'
  (gem) actionpack-3.2.8/lib/action_view/template.rb:145:in `block in render'
  (gem) activesupport-3.2.8/lib/active_support/notifications.rb:125:in `instrument'
  (gem) actionpack-3.2.8/lib/action_view/template.rb:143:in `render'
  (gem) actionpack-3.2.8/lib/action_view/renderer/template_renderer.rb:47:in `block (2 levels) in render_template'
  (gem) actionpack-3.2.8/lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
  (gem) activesupport-3.2.8/lib/active_support/notifications.rb:123:in `block in instrument'
  (gem) activesupport-3.2.8/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
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  (gem) actionmailer-3.2.8/lib/action_mailer/base.rb:636:in `mail'
  app/mailers/purchase_mailer.rb:12:in `purchase_confirmation'
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  (gem) actionmailer-3.2.8/lib/action_mailer/base.rb:439:in `method_missing'
  app/controllers/purchases_controller.rb:6:in `create'
  (gem) actionpack-3.2.8/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  (gem) actionpack-3.2.8/lib/abstract_controller/base.rb:167:in `process_action'
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  (gem) actionpack-3.2.8/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
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Answer 1

ビューでそれらを使用する前に、を割り当てる必要がありinstance variableます。あなたの場合、そのpurchase変数。メーラーメソッドを次のようにします

 def purchase_confirmation(purchase)
    @greeting = "Hi"
    @purchase = purchase
    mail to: purchase.email, subject: "Purchase Confirmation"
  end
end

ビューでは、これを行う必要があります

<%= @purchase.email %>

<%= @greeting %>, thanks for your purchase! We're on it! 

Answer 2

もう 1 つのオプションは、インスタンス変数を他のクラスからアクセスできるようにすることです。

 class PurchasesController < InheritedResources::Base
 #adding this will allow you to access the instance variable in other classes. 
 attr_accessor :purchase
2 before_filter :authenticate_admin_user!, :only => [:index, :edit, :update, :destroy]
3         def create
4                 @purchase = Purchase.new(params[:purchase])
5   if @purchase.save
6           PurchaseMailer.purchase_confirmation(@purchase).deliver
7   redirect_to "/thankyou"
8 else
9 
10   render :action => "new"
11 end