我正在尝试使用Capistrano部署新版本，并且在asset：precompile任务期间出现错误
undefined method []' for nil:NilClass
完整的堆栈跟踪如下：
/home/deploy/bikeramp/releases/20190108123149/config/initializers/carrierwave.rb:5:in `block in <top (required)>'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/carrierwave-1.3.1/lib/carrierwave/uploader/configuration.rb:161:in `configure'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/carrierwave-1.3.1/lib/carrierwave.rb:14:in `configure'
/home/deploy/bikeramp/releases/20190108123149/config/initializers/carrierwave.rb:1:in `<top (required)>'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:285:in `load'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:285:in `block in load'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:257:in `load_dependency'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:285:in `load'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/engine.rb:657:in `block in load_config_initializer'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/notifications.rb:170:in `instrument'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/engine.rb:656:in `load_config_initializer'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/engine.rb:614:in `block (2 levels) in <class:Engine>'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/engine.rb:613:in `each'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/engine.rb:613:in `block in <class:Engine>'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:32:in `instance_exec'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:32:in `run'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:61:in `block in run_initializers'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:50:in `each'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:50:in `tsort_each_child'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/initializable.rb:60:in `run_initializers'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/application.rb:361:in `initialize!'
/home/deploy/bikeramp/releases/20190108123149/config/environment.rb:5:in `<top (required)>'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `block in require'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:257:in `load_dependency'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/application.rb:337:in `require_environment!'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/railties-5.2.2/lib/rails/application.rb:520:in `block in run_tasks_blocks'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:62:in `block (2 levels) in define'
/home/deploy/bikeramp/shared/bundle/ruby/2.5.0/gems/rake-12.3.2/exe/rake:27:in `<top (required)>'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/cli/exec.rb:74:in `load'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/cli/exec.rb:74:in `kernel_load'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/cli/exec.rb:28:in `run'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/cli.rb:463:in `exec'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/cli.rb:27:in `dispatch'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/cli.rb:18:in `start'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/exe/bundle:30:in `block in <top (required)>'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
/home/deploy/.rvm/gems/ruby-2.5.1/gems/bundler-1.17.1/exe/bundle:22:in `<top (required)>'
/home/deploy/.rvm/gems/ruby-2.5.1/bin/bundle:23:in `load'
/home/deploy/.rvm/gems/ruby-2.5.1/bin/bundle:23:in `<main>'
/home/deploy/.rvm/gems/ruby-2.5.1/bin/ruby_executable_hooks:15:in `eval'
/home/deploy/.rvm/gems/ruby-2.5.1/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => environment
(See full trace by running task with --trace)
载波配置
config/initializers/carrierwave.rb
CarrierWave.configure do |config|
if Rails.env.production? || Rails.env.development?
config.asset_host = 'https://some_host'
config.fog_provider = 'fog/aws'
config.enable_processing = true
config.fog_directory = Rails.application.credentials.aws[:bucket] # required
config.fog_public = false # optional, defaults to true
config.fog_attributes = { "Cache-Control" => "max-age=315576000" } # optional, defaults to {}
config.fog_credentials = {
provider: "AWS", # required
aws_access_key_id: Rails.application.credentials.aws[:access_key_id], # required
aws_secret_access_key: Rails.application.credentials.aws[:secret_access_key], # required
region: Rails.application.credentials.aws[:region] # optional, defaults to 'us-east-1'
}
config.storage = :fog
else
config.enable_processing = false
config.storage = :file
end
end
该错误消息指向第5行，即config.enable_processing = true，所以我不确定为什么会收到此错误。
我究竟做错了什么？我想念什么吗？