Rails 5中的RuntimeError無法修改凍結的字符串

我無法弄清楚爲什麼我在應用程序中收到「無法修改凍結字符串」錯誤。Rails 5中的RuntimeError無法修改凍結的字符串

我試圖預覽郵件我已經在測試/郵寄/預覽創建/ user_mailer_preview.rb

我的郵件預覽類如下：使用

class UserMailerPreview < ActionMailer::Preview 

    # Preview this email at http://localhost:3000/rails/mailers/user_mailer/account_activation 
    def account_activation 
    user = User.first 
    user.activation_token = User.new_token 
    UserMailer.account_activation(user) 
    end

UserMailer類方法：

class UserMailer < ApplicationMailer 
    def account_activation(user) 
    @user = user 
    mail to: user.email, subject: "Mock Twitter App account activation" 
    end

User.rb型號：

class User < ApplicationRecord 
    attr_accessor :remember_token, :activation_token 
    . 
    . 
    # Creates randonly generated token 
    def self.new_token 
    SecureRandom.urlsafe_base64 
    end

簡單的郵件我試圖預覽它生活在視圖/ user_mailer文件/ account_activation.html/ERB

Hi <%= @user.name %>, 

<p> 
    Welcome to the Mock Twitter App! Click the link below to active your account: 
</p> 
<%= link_to "Activate account", edit_account_activation_url(@user.activation_token, email: @user.email) %>

以下是服務器日誌：

Started GET "/rails/mailers/user_mailer/account_activation" for ::1 at 2016-07-23 19:18:31 -0500 
Processing by Rails::MailersController#preview as HTML 
    Parameters: {"internal"=>true, "path"=>"user_mailer/account_activation"} 
    User Load (0.9ms) SELECT "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ? [["LIMIT", 1]] 
    Rendering user_mailer/account_activation.html.erb within layouts/mailer 
    Rendered user_mailer/account_activation.html.erb within layouts/mailer (0.8ms) 
    Rendering user_mailer/account_activation.text.erb within layouts/mailer 
    Rendered user_mailer/account_activation.text.erb within layouts/mailer (0.5ms) 
UserMailer#account_activation: processed outbound mail in 22.3ms 
Completed 500 Internal Server Error in 62ms (ActiveRecord: 2.8ms) 



RuntimeError (can't modify frozen String): 

actionmailer (5.0.0) lib/action_mailer/inline_preview_interceptor.rb:29:in `gsub!' 
actionmailer (5.0.0) lib/action_mailer/inline_preview_interceptor.rb:29:in `transform!' 
actionmailer (5.0.0) lib/action_mailer/inline_preview_interceptor.rb:19:in `previewing_email' 
actionmailer (5.0.0) lib/action_mailer/preview.rb:113:in `block in inform_preview_interceptors' 
actionmailer (5.0.0) lib/action_mailer/preview.rb:112:in `each' 
actionmailer (5.0.0) lib/action_mailer/preview.rb:112:in `inform_preview_interceptors' 
actionmailer (5.0.0) lib/action_mailer/preview.rb:67:in `call' 
railties (5.0.0) lib/rails/mailers_controller.rb:22:in `preview' 
actionpack (5.0.0) lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action' 
actionpack (5.0.0) lib/abstract_controller/base.rb:188:in `process_action' 
actionpack (5.0.0) lib/action_controller/metal/rendering.rb:30:in `process_action' 
actionpack (5.0.0) lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
activesupport (5.0.0) lib/active_support/callbacks.rb:126:in `call' 
activesupport (5.0.0) lib/active_support/callbacks.rb:506:in `block (2 levels) in compile' 
activesupport (5.0.0) lib/active_support/callbacks.rb:455:in `call' 
activesupport (5.0.0) lib/active_support/callbacks.rb:101:in `__run_callbacks__' 
activesupport (5.0.0) lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks' 
activesupport (5.0.0) lib/active_support/callbacks.rb:90:in `run_callbacks' 
actionpack (5.0.0) lib/abstract_controller/callbacks.rb:19:in `process_action' 
actionpack (5.0.0) lib/action_controller/metal/rescue.rb:20:in `process_action' 
actionpack (5.0.0) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' 
activesupport (5.0.0) lib/active_support/notifications.rb:164:in `block in instrument' 
activesupport (5.0.0) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (5.0.0) lib/active_support/notifications.rb:164:in `instrument' 
actionpack (5.0.0) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
actionpack (5.0.0) lib/action_controller/metal/params_wrapper.rb:248:in `process_action' 
activerecord (5.0.0) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (5.0.0) lib/abstract_controller/base.rb:126:in `process' 
actionview (5.0.0) lib/action_view/rendering.rb:30:in `process' 
actionpack (5.0.0) lib/action_controller/metal.rb:190:in `dispatch' 
actionpack (5.0.0) lib/action_controller/metal.rb:262:in `dispatch' 
actionpack (5.0.0) lib/action_dispatch/routing/route_set.rb:50:in `dispatch' 
actionpack (5.0.0) lib/action_dispatch/routing/route_set.rb:32:in `serve' 
actionpack (5.0.0) lib/action_dispatch/journey/router.rb:39:in `block in serve' 
actionpack (5.0.0) lib/action_dispatch/journey/router.rb:26:in `each' 
actionpack (5.0.0) lib/action_dispatch/journey/router.rb:26:in `serve' 
actionpack (5.0.0) lib/action_dispatch/routing/route_set.rb:725:in `call' 
rack (2.0.1) lib/rack/etag.rb:25:in `call' 
rack (2.0.1) lib/rack/conditional_get.rb:25:in `call' 
rack (2.0.1) lib/rack/head.rb:12:in `call' 
rack (2.0.1) lib/rack/session/abstract/id.rb:222:in `context' 
rack (2.0.1) lib/rack/session/abstract/id.rb:216:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/cookies.rb:613:in `call' 
activerecord (5.0.0) lib/active_record/migration.rb:552:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/callbacks.rb:38:in `block in call' 
activesupport (5.0.0) lib/active_support/callbacks.rb:97:in `__run_callbacks__' 
activesupport (5.0.0) lib/active_support/callbacks.rb:750:in `_run_call_callbacks' 
activesupport (5.0.0) lib/active_support/callbacks.rb:90:in `run_callbacks' 
actionpack (5.0.0) lib/action_dispatch/middleware/callbacks.rb:36:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/executor.rb:12:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/remote_ip.rb:79:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call' 
web-console (3.1.1) lib/web_console/middleware.rb:131:in `call_app' 
web-console (3.1.1) lib/web_console/middleware.rb:28:in `block in call' 
web-console (3.1.1) lib/web_console/middleware.rb:18:in `catch' 
web-console (3.1.1) lib/web_console/middleware.rb:18:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call' 
railties (5.0.0) lib/rails/rack/logger.rb:36:in `call_app' 
railties (5.0.0) lib/rails/rack/logger.rb:24:in `block in call' 
activesupport (5.0.0) lib/active_support/tagged_logging.rb:70:in `block in tagged' 
activesupport (5.0.0) lib/active_support/tagged_logging.rb:26:in `tagged' 
activesupport (5.0.0) lib/active_support/tagged_logging.rb:70:in `tagged' 
railties (5.0.0) lib/rails/rack/logger.rb:24:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/request_id.rb:24:in `call' 
rack (2.0.1) lib/rack/method_override.rb:22:in `call' 
rack (2.0.1) lib/rack/runtime.rb:22:in `call' 
activesupport (5.0.0) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/executor.rb:12:in `call' 
actionpack (5.0.0) lib/action_dispatch/middleware/static.rb:136:in `call' 
rack (2.0.1) lib/rack/sendfile.rb:111:in `call' 
railties (5.0.0) lib/rails/engine.rb:522:in `call' 
puma (3.4.0) lib/puma/configuration.rb:224:in `call' 
puma (3.4.0) lib/puma/server.rb:569:in `handle_request' 
puma (3.4.0) lib/puma/server.rb:406:in `process_client' 
puma (3.4.0) lib/puma/server.rb:271:in `block in run' 
puma (3.4.0) lib/puma/thread_pool.rb:114:in `block in spawn_thread'

我一直在找周圍的網一會兒，似乎無法弄清楚爲什麼我得到這個錯誤。我認爲MailsController的軌道試圖改變activation_token？

任何有識之士將不勝感激。

來源

2016-07-24 Scap

懶得顯示錯誤日誌，以便我們可以檢查其中的錯誤真的是？ – uday

對不起，添加服務器日誌 – Scap

用'mail'代碼替換這個：'mail（to：user.email，subject：「Mock Twitter App account activation」）'讓我知道它是否工作 – uday

我找到了正確的答案。儘管Seal的答案有效，但真正的問題是我錯過了一個完整的'layouts/mailer.html.erb'文件。該文件是空白，導致凍結字符串錯誤，導致「nil」身體遺失。

「佈局/ mailer.html.erb」現在是：

<!DOCTYPE html> 
<html> 
    <head> 
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
    <style> 
     /* Email styles need to be inline */ 
    </style> 
    </head> 

    <body> 
    <%= yield %> 
    </body> 
</html>

來源

2016-07-24 20:36:42 Scap

添加正文到您的郵件。

def account_activation(user) 
    @user = user 
    mail(to: user.email, subject: "Mock Twitter App account activation", body: "meow") 
    end

如果身體是零而不是「凍結」。

來源

2016-07-24 20:16:42 Seal

這工作，謝謝。 – Scap

Rails 5中的RuntimeError無法修改凍結的字符串

回答

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