未定義的方法'[]'爲零：mandrill郵件上的NilClass

Question

我試圖使用mandrill_mailer gem來控制交易電子郵件，雖然它返回一個undefined method [] for nil:NilClass錯誤並突出顯示我的郵件中的一行，即使我刪除此行而其他大多數問題似乎仍然存在。

郵寄/ panel_mailer.rb

class PanelMailer < MandrillMailer::TemplateMailer 

    def blast(user, template) 

    humans = user.humans 

    mandrill_mail(
     template: 'blast-1', 
     subject: template.subject, 
     to: [ 
     { email: "callum@hotmail.com", name: "Callum Short" } 
     ], 
     vars: { 
     'BG_COLOUR' => "##{user.bghex}", 
     'LOGO' => user.logourl_url 
     }, 
     template_content: {'body' => template.body}, 
     inline_css: true, 
     preserve_recipients: true, 
     recipient_vars: {"callum@hotmail.com" => {'FULL_NAME' => "Callum Short"}} 
    ) 
    end 
end 

完全跟蹤：

mandrill_mailer (0.5.1) lib/mandrill_mailer/template_mailer.rb:171:in `mandrill_mail' 
mandrill_mailer (0.5.1) lib/mandrill_mailer/core_mailer.rb:278:in `call' 
mandrill_mailer (0.5.1) lib/mandrill_mailer/core_mailer.rb:278:in `method_missing' 
actionpack (4.1.8) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (4.1.8) lib/abstract_controller/base.rb:189:in `process_action' 
actionpack (4.1.8) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (4.1.8) lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
activesupport (4.1.8) lib/active_support/callbacks.rb:113:in `call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:113:in `call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting' 
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `block in halting' 
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `block in halting' 
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting' 
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting' 
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting' 
activesupport (4.1.8) lib/active_support/callbacks.rb:86:in `call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:86:in `run_callbacks' 
actionpack (4.1.8) lib/abstract_controller/callbacks.rb:19:in `process_action' 
actionpack (4.1.8) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (4.1.8) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action' 
activesupport (4.1.8) lib/active_support/notifications.rb:159:in `block in instrument' 
activesupport (4.1.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (4.1.8) lib/active_support/notifications.rb:159:in `instrument' 
actionpack (4.1.8) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
actionpack (4.1.8) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' 
activerecord (4.1.8) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (4.1.8) lib/abstract_controller/base.rb:136:in `process' 
actionview (4.1.8) lib/action_view/rendering.rb:30:in `process' 
actionpack (4.1.8) lib/action_controller/metal.rb:196:in `dispatch' 
actionpack (4.1.8) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' 
actionpack (4.1.8) lib/action_controller/metal.rb:232:in `block in action' 
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:82:in `call' 
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:82:in `dispatch' 
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:50:in `call' 
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:73:in `block in call' 
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:59:in `each' 
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:59:in `call' 
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:678:in `call' 
omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!' 
omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call' 
omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!' 
omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call' 
omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!' 
omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call' 
warden (1.2.3) lib/warden/manager.rb:35:in `block in call' 
warden (1.2.3) lib/warden/manager.rb:34:in `catch' 
warden (1.2.3) lib/warden/manager.rb:34:in `call' 
rack (1.5.2) lib/rack/etag.rb:23:in `call' 
rack (1.5.2) lib/rack/conditionalget.rb:35:in `call' 
rack (1.5.2) lib/rack/head.rb:11:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/params_parser.rb:27:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/flash.rb:254:in `call' 
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context' 
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/cookies.rb:560:in `call' 
activerecord (4.1.8) lib/active_record/query_cache.rb:36:in `call' 
activerecord (4.1.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call' 
activerecord (4.1.8) lib/active_record/migration.rb:380:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
activesupport (4.1.8) lib/active_support/callbacks.rb:82:in `run_callbacks' 
actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/reloader.rb:73:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/remote_ip.rb:76:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' 
railties (4.1.8) lib/rails/rack/logger.rb:38:in `call_app' 
railties (4.1.8) lib/rails/rack/logger.rb:20:in `block in call' 
activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `block in tagged' 
activesupport (4.1.8) lib/active_support/tagged_logging.rb:26:in `tagged' 
activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `tagged' 
railties (4.1.8) lib/rails/rack/logger.rb:20:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' 
rack (1.5.2) lib/rack/runtime.rb:17:in `call' 
activesupport (4.1.8) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call' 
rack (1.5.2) lib/rack/lock.rb:17:in `call' 
actionpack (4.1.8) lib/action_dispatch/middleware/static.rb:84:in `call' 
rack (1.5.2) lib/rack/sendfile.rb:112:in `call' 
railties (4.1.8) lib/rails/engine.rb:514:in `call' 
railties (4.1.8) lib/rails/application.rb:144:in `call' 
rack (1.5.2) lib/rack/lock.rb:17:in `call' 
rack (1.5.2) lib/rack/content_length.rb:14:in `call' 
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service' 
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' 

Answer 1

登錄到mailchimp，去模板，選擇您的模板，然後選擇 「發送到山魈」

錯誤將消失:)

我會在不久的將來在這個http://rby.io/r/5509d6

Answer 2

由於使用內部郵件URL傭工你應該定義default_url_options作爲哈希並指定:host選項以及在development.rb或production.rb（它們可能會有所不同）：

config.mandrill_mailer.default_url_options = { host: 'localhost:3000' } 

錯誤被拋出，因爲default_url_options是nil而url助手正在嘗試使用:[]方法來獲取一些屬性。

method_missing出現在錯誤追蹤中只是MandrillMailer的方式來獲得訪問Rails url助手。