diff options
Diffstat (limited to 'railties/guides/source/initialization.textile')
| -rw-r--r-- | railties/guides/source/initialization.textile | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/railties/guides/source/initialization.textile b/railties/guides/source/initialization.textile index 036b356a37..5ae9cf0f2b 100644 --- a/railties/guides/source/initialization.textile +++ b/railties/guides/source/initialization.textile @@ -17,7 +17,7 @@ As of Rails 3, +script/server+ has become +rails server+. This was done to centr h4. +bin/rails+ -The actual +rails+ command is kept in _bin/rails_ at the and goes like this: +The actual +rails+ command is kept in _bin/rails_: <ruby> #!/usr/bin/env ruby @@ -31,7 +31,7 @@ rescue LoadError end </ruby> -This file will attempt to load +rails/cli+ and if it cannot find it then add the +railties/lib+ path to the load path (+$:+) and will then try to require it again. +This file will attempt to load +rails/cli+. If it cannot find it then +railties/lib+ is added to the load path (+$:+) before retrying. h4. +railties/lib/rails/cli.rb+ @@ -56,7 +56,7 @@ else end </ruby> -The +rbconfig+ file here is out of Ruby's standard library and provides us with the +RbConfig+ class which contains useful information dependent on how Ruby was compiled. We'll see this in use in +railties/lib/rails/script_rails_loader+. +The +rbconfig+ file from the Ruby standard library provides us with the +RbConfig+ class which contains detailed information about the Ruby environment, including how Ruby was compiled. We can see this in use in +railties/lib/rails/script_rails_loader+. <ruby> require 'pathname' @@ -71,7 +71,7 @@ module Rails end </ruby> -The +rails/script_rails_loader+ file uses +RbConfig::Config+ to gather up the +bin_dir+ and +ruby_install_name+ values for the configuration which will result in a path such as +/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby+, which is the default path on Mac OS X. If you're running Windows the path may be something such as +C:/Ruby192/bin/ruby+. Anyway, the path on your system may be different, but the point of this is that it will point at the known ruby executable location for your install. The +RbConfig::CONFIG["EXEEXT"]+ will suffix this path with ".exe" if the script is running on Windows. This constant is used later on in +exec_script_rails!+. As for the +SCRIPT_RAILS+ constant, we'll see that when we get to the +in_rails_application?+ method. +The +rails/script_rails_loader+ file uses +RbConfig::Config+ to obtain the +bin_dir+ and +ruby_install_name+ values for the configuration which together form the path to the Ruby interpreter. The +RbConfig::CONFIG["EXEEXT"]+ will suffix this path with ".exe" if the script is running on Windows. This constant is used later on in +exec_script_rails!+. As for the +SCRIPT_RAILS+ constant, we'll see that when we get to the +in_rails_application?+ method. Back in +rails/cli+, the next line is this: @@ -79,7 +79,7 @@ Back in +rails/cli+, the next line is this: Rails::ScriptRailsLoader.exec_script_rails! </ruby> -This method is defined in +rails/script_rails_loader+ like this: +This method is defined in +rails/script_rails_loader+: <ruby> def self.exec_script_rails! @@ -96,7 +96,7 @@ rescue SystemCallError end </ruby> -This method will first check if the current working directory (+cwd+) is a Rails application or is a subdirectory of one. The way to determine this is defined in the +in_rails_application?+ method like this: +This method will first check if the current working directory (+cwd+) is a Rails application or a subdirectory of one. This is determined by the +in_rails_application?+ method: <ruby> def self.in_rails_application? @@ -104,7 +104,7 @@ def self.in_rails_application? end </ruby> -The +SCRIPT_RAILS+ constant defined earlier is used here, with +File.exists?+ checking for its presence in the current directory. If this method returns +false+, then +in_rails_application_subdirectory?+ will be used: +The +SCRIPT_RAILS+ constant defined earlier is used here, with +File.exists?+ checking for its presence in the current directory. If this method returns +false+ then +in_rails_application_subdirectory?+ will be used: <ruby> def self.in_rails_application_subdirectory?(path = Pathname.new(Dir.pwd)) @@ -112,17 +112,17 @@ def self.in_rails_application_subdirectory?(path = Pathname.new(Dir.pwd)) end </ruby> -This climbs the directory tree until it reaches a path which contains a +script/rails+ file. If a directory is reached which contains this file then this line will run: +This climbs the directory tree until it reaches a path which contains a +script/rails+ file. If a directory containing this file is reached then this line will run: <ruby> exec RUBY, SCRIPT_RAILS, *ARGV if in_rails_application? </ruby> -This is effectively the same as doing +ruby script/rails [arguments]+. Where +[arguments]+ at this point in time is simply "server". +This is effectively the same as running +ruby script/rails [arguments]+, where +[arguments]+ at this point in time is simply "server". h4. +script/rails+ -This file looks like this: +This file is as follows: <ruby> APP_PATH = File.expand_path('../../config/application', __FILE__) @@ -130,7 +130,7 @@ require File.expand_path('../../config/boot', __FILE__) require 'rails/commands' </ruby> -The +APP_PATH+ constant here will be used later in +rails/commands+. The +config/boot+ file that +script/rails+ references is the +config/boot.rb+ file in our application which is responsible for loading Bundler and setting it up. +The +APP_PATH+ constant will be used later in +rails/commands+. The +config/boot+ file referenced here is the +config/boot.rb+ file in our application which is responsible for loading Bundler and setting it up. h4. +config/boot.rb+ |