ruby-on-rails – “$bin / rails”中的“bin”是什么意思？

运行bundle install –binstubs,它会工作.你只需要做一次,Bundler会记住你要求它(对于那个项目).

更长的答案

当您使用bundle -binstubs安装bundle时,Bundler会将所有特定于bundle的binstub安装到bin /子目录(相对于Gemfile),而不是将它们放入gemset的全局binstub路径中.

您通常会这样做：

>确保您正在运行的rails binstub是Gemfile中的那个(而不是以后与Bundler分开安装到gemset中的不同版本),以及
>改进执行时间(因为它在功能上等同于捆绑exec rails除了减去一个子进程调用之外).

全局binstubs与Bundler binstubs

如果你键入哪个rails,你会得到一个很长的路径,比如/usr/local/rvm/gems/jruby-1.7.18/bin/rails,其中的内容是：cat` which rails`

#!/usr/bin/env jruby_executable_hooks
#
# This file was generated by RubyGems.
#
# The application 'railties' is installed as part of a gem,and
# this file is here to facilitate running it.
#

require 'rubygems'

version = ">= 0"

if ARGV.first
  str = ARGV.first
  str = str.dup.force_encoding("BINARY") if str.respond_to? :force_encoding
  if str =~ /A_(.*)_z/
    version = $1
    ARGV.shift
  end
end

gem 'railties',version
load Gem.bin_path('railties','rails',version)

运行bundler –binstubs之后,如果你使用bin / rails,你会得到类似的东西：

#!/usr/bin/env jruby
#
# This file was generated by Bundler.
#
# The application 'rails' is installed as part of a gem,and
# this file is here to facilitate running it.
#

require 'pathname'
ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../../Gemfile",Pathname.new(__FILE__).realpath)

require 'rubygems'
require 'bundler/setup'

load Gem.bin_path('railties','rails')

关键的区别在于bin / version设置了BUNDLE_GEMFILE环境变量,它需要bundler / setup,这就是告诉Bundler用gem路径做的事情. bin / rails脚本具有捆绑器感知功能,并且可以识别您的Gemfile,因此它可以立即为您的环境做好准备.

我通常建议在gemset版本上使用–binstubs和bin / x调用.