如何在 Rails 4.2 中正确设置 Pry

Question

我很困惑需要安装哪些 gem 才能正确运行在 Rails 4.2 项目中撬动。直到最近，我似乎还过得很好。出于某种原因，每当我尝试在命令行中使用 next、step 等单步执行控制台会话时，binding.pry 现在似乎会吐出。它会抛出一个丑陋的堆栈跟踪，然后在代码中显示相同的点，而不是进一步。在第二个 next 命令之后，它抛出相同的堆栈跟踪并退出，将执行返回到本地主机服务器。我在 No frames collected 的浏览器页面上收到运行时间错误。

如果我在代码中注释掉 binding.pry，一切正常。所以我强烈怀疑我的 Pry 配置有问题。似乎有几十种 Pry 变体，没有明确的指导说明应该安装哪个（哪些），哪个可能会发生冲突等。

这是我在代码到达 binding.pry 调用后在 Pry 控制台中调用 next 时获得的堆栈跟踪：

From: /Users/me/sites/arailsapp/app/controllers/bars_controller.rb @ line 31 BarsController#edit:

    29: def edit
    30:   binding.pry
 => 31:   @bar = Bar.find(params[:id])
    32:   @foo = @bar.foo
    33: end

[6] pry(#<BarsController>)> n
Completed 500 Internal Server Error in 2685ms (ActiveRecord: 0.0ms)

RuntimeError - No frames collected.:
  pry-byebug (3.2.0) lib/byebug/processors/pry_processor.rb:122:in `perform_next'
  pry-byebug (3.2.0) lib/byebug/processors/pry_processor.rb:60:in `perform'
  pry-byebug (3.2.0) lib/byebug/processors/pry_processor.rb:49:in `run'
  pry-byebug (3.2.0) lib/byebug/processors/pry_processor.rb:111:in `resume_pry'
  pry-byebug (3.2.0) lib/byebug/processors/pry_processor.rb:69:in `at_line'
  byebug (5.0.0) lib/byebug/context.rb:90:in `at_line'
  app/controllers/scholarships_controller.rb:31:in `edit'
  actionpack (4.2.1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  actionpack (4.2.1) lib/abstract_controller/base.rb:198:in `process_action'
  actionpack (4.2.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
  actionpack (4.2.1) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
  activesupport (4.2.1) lib/active_support/callbacks.rb:117:in `call'

  # omitting the next ~40 lines in the Rails stack...

第二节看起来与第一节相同 - 此时执行 returns 到服务器。

这是我的 Gemfile：

source 'https://rubygems.org'

ruby '2.2.0'

gem 'rails', '4.2.1'
gem 'pg', '~> 0.18.2'
gem 'haml-rails', '~> 0.9.0'
gem 'sass-rails', '~> 5.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc
gem 'will_paginate', '~> 3.0.7'
gem 'will_paginate-bootstrap'
gem "nilify_blanks"
gem 'filterrific', '~> 2.0.5'
gem 'chardinjs-rails'

# Install bootstrap and associated gems
gem 'bootstrap-sass', '~> 3.3.4.1'
gem 'autoprefixer-rails', '~> 5.2.0'

# Use ActiveModel has_secure_password
gem 'bcrypt', '~> 3.1.7'

group :production do
  gem 'rails_12factor', '~> 0.0.3'
end

group :assets do
  gem 'uglifier', '>= 1.3.0'
  gem 'coffee-rails', '~> 4.1.0'
end

group :development do
  gem 'better_errors', '~> 2.1.1'
  gem 'annotate', '~> 2.6.10'
end

group :development, :test do
  gem 'pry-rails'
  gem 'pry-stack_explorer'      
  gem 'pry-byebug'
  gem 'web-console', '~> 2.0'
  gem 'spring'
  gem 'spring-commands-rspec', '~> 1.0.4'
  gem 'rspec-rails', '~> 3.2.3'
  gem 'guard-rspec', '~> 4.6.0'
  gem 'sqlite3'
  gem 'factory_girl_rails', '~> 4.5.0', require: false
end

group :test do
  gem 'database_cleaner', '~> 1.4.1'
  gem 'faker', '~> 1.4.3'
  gem 'capybara', '~> 2.4.4'
  gem 'launchy', '~> 2.4.3'
  gem 'shoulda', '~> 3.5.0'
end

我也试过 pry-stack_explorer 和 pry-byebug gem 被注释掉了...没有区别。

最后，我的 .pryrc 文件：

# ~/.pryrc
if defined?(PryByebug)
  Pry.commands.alias_command 'c', 'continue'
  Pry.commands.alias_command 's', 'step'
  Pry.commands.alias_command 'n', 'next'
  Pry.commands.alias_command 'f', 'finish'
end

# Hit Enter to repeat last command
Pry::Commands.command /^$/, "repeat last command" do
  _pry_.run_command Pry.history.to_a.last
end

Answer 1

一些摆弄和几次服务器重启似乎已经解决了这个问题。感谢 Deivid 建议删除 pry-stack_explorer。这是测试和开发组的 Gemfile：

group :development do
  gem 'better_errors', '~> 2.1.1'
  gem 'annotate', '~> 2.6.10'
end

group :development, :test do
  gem 'pry-rails'
  gem 'pry-byebug'
  gem 'web-console', '~> 2.0'
  gem 'spring'
  gem 'spring-commands-rspec', '~> 1.0.4'
  gem 'rspec-rails', '~> 3.2.3'
  gem 'guard-rspec', '~> 4.6.0'
  gem 'sqlite3'
  gem 'factory_girl_rails', '~> 4.5.0', require: false
end

group :test do
  gem 'database_cleaner', '~> 1.4.1'
  gem 'faker', '~> 1.4.3'
  gem 'capybara', '~> 2.4.4'
  gem 'launchy', '~> 2.4.3'
  gem 'shoulda', '~> 3.5.0'
end

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