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我被困在一個非常奇怪的問題上。我在開發環境中成功開發和測試了我的Rails應用程序，但是在讓我的網站啓動並在生產環境中運行的過程中，我需要運行rake secret命令。不幸的是，我遇到了以下錯誤消息：Rails NoMethodError：undefined方法`[] ='for nil：生產環境中的NilClass
rake aborted!
NoMethodError: undefined method `[]=' for nil:NilClass
/var/www/html/comigo/comigo/config/application.rb:31:in `<class:Application>'
/var/www/html/comigo/comigo/config/application.rb:19:in `<module:Comigo>'
/var/www/html/comigo/comigo/config/application.rb:18:in `<top (required)>'
/var/www/html/comigo/comigo/Rakefile:4:in `require'
/var/www/html/comigo/comigo/Rakefile:4:in `<top (required)>'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/rake_module.rb:28:in `load'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/rake_module.rb:28:in `load_rakefile'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/application.rb:686:in `raw_load_rakefile'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/application.rb:96:in `block in load_rakefile'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/application.rb:178:in `standard_exception_handling'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/application.rb:95:in `load_rakefile'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/application.rb:79:in `block in run'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/application.rb:178:in `standard_exception_handling'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/lib/rake/application.rb:77:in `run'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/gems/rake-11.2.2/exe/rake:27:in `<top (required)>'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/bin/rake:22:in `load'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/bin/rake:22:in `<main>'
/home/deplguerrabr/.rvm/gems/ruby-2.3.1/bin/ruby_executable_hooks:15:in `eval'
搜索網站我被重定向到一些相關的問題，但沒有其中的一個進行了嚴格和我一樣。在這裏我列舉一些問題，可能會給我一個項目環境的大圖： 1）我正在使用devise進行身份驗證（版本3.4.1） 2）此問題僅出現在生產環境中 3）我有紅寶石的生產和開發 環境 4）相同的版本和鐵軌下面是我使用的寶石：
actionmailer (4.2.6)
actionpack (4.2.6)
actionview (4.2.6)
activejob (4.2.6)
activemodel (4.2.6)
activerecord (4.2.6)
activesupport (4.2.6)
acts_as_votable (0.10.0)
arel (6.0.3)
autoprefixer-rails (6.4.1.1, 6.3.7, 6.3.6)
bcrypt (3.1.11)
bigdecimal (default: 1.2.8)
binding_of_caller (0.7.2)
bootstrap-sass (3.2.0.2)
bootstrap-tagsinput-rails (0.4.2.1)
bootsy (2.2.2)
bson (3.2.6)
bson_ext (1.5.1)
builder (3.2.2)
bundler (1.12.5)
bundler-unload (1.0.2)
bxslider-rails (4.2.5.1)
byebug (9.0.5, 9.0.3)
cancancan (1.14.0)
carrierwave (0.11.2)
carrierwave-mongoid (0.10.0, 0.9.0)
client_side_validations (4.2.3)
climate_control (0.0.3)
cocaine (0.5.8)
coffee-rails (4.1.1)
coffee-script (2.4.1)
coffee-script-source (1.10.0)
commonjs (0.2.7)
concurrent-ruby (1.0.2)
countries (1.2.5)
country_select (2.5.2)
currencies (0.4.2)
debug_inspector (0.0.2)
devise (4.2.0, 4.1.1, 3.4.1)
did_you_mean (1.0.0)
erubis (2.7.0)
execjs (2.7.0, 2.6.0)
executable-hooks (1.3.2)
faraday (0.9.2)
faraday_middleware (0.9.2)
fileutils (0.7)
font-awesome-rails (4.6.3.0)
gem-wrappers (1.2.7)
geoip (1.4.0)
globalid (0.3.7, 0.3.6)
gmaps4rails (2.1.2)
google_visualr (2.5.1)
haml (4.0.7)
hashie (3.4.4)
httpauth (0.2.1)
i18n (0.7.0)
i18n_data (0.7.0)
image-picker-rails (0.2.4)
instagram (1.1.6)
io-console (default: 0.4.5)
jbuilder (2.6.0, 2.5.0, 2.4.1)
jquery-migrate-rails (1.2.1)
jquery-rails (4.2.1, 4.1.1)
jquery-slick-rails (1.6.0.2)
jquery-ui-rails (5.0.5)
js_regex (1.0.14)
json (default: 1.8.3)
jwt (1.5.4, 1.5.1, 0.1.13)
kaminari (0.16.3)
less (2.6.0)
less-rails (2.7.1)
libv8 (3.16.14.15 x86_64-linux)
loofah (2.0.3)
mail (2.6.4)
mime-types (3.1, 3.0)
mime-types-data (3.2016.0521, 3.2016.0221)
mimemagic (0.3.2, 0.3.1)
mini_magick (4.5.1)
mini_portile2 (2.1.0, 2.0.0)
minitest (5.9.0, 5.8.3)
mongo (2.1.0.beta)
multi_json (1.12.1, 1.12.0)
multi_xml (0.5.5)
multipart-post (2.0.0)
mysql2 (0.4.4)
nested_form (0.3.2)
net-telnet (0.1.1)
nokogiri (1.6.8, 1.6.7.2)
oauth (0.5.1)
oauth2 (1.2.0, 1.1.0, 0.8.1)
omniauth (1.3.1)
omniauth-facebook (4.0.0, 3.0.0, 1.4.0)
omniauth-oauth (1.1.0)
omniauth-oauth2 (1.4.0, 1.0.3)
omniauth-twitter (1.2.1)
origin (2.2.0)
orm_adapter (0.5.0)
paperclip (5.0.0.beta2)
passenger (5.0.28)
pdf-core (0.6.1)
pg (0.18.4)
pkg-config (1.1.7)
power_assert (0.2.6)
prawn (2.1.0)
prawn-table (0.2.2)
prawnto_2 (0.2.6)
psych (default: 2.0.17)
rack (1.6.4)
rack-pjax (0.8.0)
rack-test (0.6.3)
rails (4.2.6)
rails-api (0.4.0)
rails-deprecated_sanitizer (1.0.3)
rails-dom-testing (1.0.7)
rails-html-sanitizer (1.0.3)
rails_12factor (0.0.3)
rails_admin (0.8.1)
rails_serve_static_assets (0.0.5)
rails_stdout_logging (0.0.5)
railties (4.2.6)
rake (11.2.2, 11.1.2, 10.4.2)
rdoc (4.2.2, default: 4.2.1)
recaptcha (3.2.0)
ref (2.0.0)
regexp_parser (0.3.3)
remotipart (1.2.1)
responders (2.3.0, 2.2.0)
rmagick (2.15.4)
rubygems-bundler (1.4.4)
rubygems-update (2.6.4)
rvm (1.11.3.9)
safe_yaml (1.0.4)
sass (3.4.22)
sass-rails (5.0.6, 5.0.5, 5.0.4)
sdoc (0.4.1)
simple_form (3.3.1, 3.2.1)
sort_alphabetical (1.0.2)
spring (1.7.2, 1.7.1)
sprockets (3.7.0, 3.6.3, 3.6.0)
sprockets-rails (3.2.0, 3.1.1, 3.0.4)
test-unit (3.1.5)
therubyracer (0.12.2)
thor (0.19.1)
thread_safe (0.3.5)
tilt (2.0.5, 2.0.4)
time_difference (0.4.2)
ttfunk (1.4.0)
turbolinks (5.0.1, 5.0.0, 2.5.3)
turbolinks-source (5.0.0)
twitter-bootswatch-rails (3.3.4.0)
twitter-bootswatch-rails-helpers (3.3.2.0)
tzinfo (1.2.2)
uglifier (3.0.2, 3.0.0)
underscore-rails (1.8.3)
unicode_utils (1.4.0)
warden (1.2.6)
web-console (2.3.0)
wysiwyg-rails (2.2.4)
Finaly，這裏是我的config/application.rb中代碼：
require File.expand_path('../boot', __FILE__)
require "rails"
# Pick the frameworks you want:
require "active_model/railtie"
require "active_job/railtie"
# require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "sprockets/railtie"
require "rails/test_unit/railtie"
# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)
module Comigo
class Application < Rails::Application
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.
# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
# config.time_zone = 'Central Time (US & Canada)'
# The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
# config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
# config.i18n.default_locale = :de
config.action_view.javascript_expansions[:defaults] = %w(jquery.min jquery_ujs)
end
謝謝，我希望任何人都可以ñ幫助我。我陷入了這個問題幾個小時！
這不是一個設計問題，你應該轉移到使用rails資產管道，刪除該行（錯誤指出的那一行）並添加jquery.min和jquery_ujs到您的JavaScript application.js清單 – arieljuod
你可以發佈代碼嗎？我不確定你在說哪一行...... –
謝謝，你幫了我！ –