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| -rw-r--r-- | guides/source/initialization.md | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/guides/source/initialization.md b/guides/source/initialization.md index 7e9cb5a47d..33eb74dcd9 100644 --- a/guides/source/initialization.md +++ b/guides/source/initialization.md @@ -29,9 +29,42 @@ quickly. Launch! ------- -Let's start to boot and initialize the app. It all begins with your app's -`bin/rails` executable. A Rails application is usually started by running -`rails console` or `rails server`. +Let's start to boot and initialize the app. A Rails application is usually +started by running `rails console` or `rails server`. + +### `railties/bin/rails` + +The `rails` in the command `rails server` is a ruby executable in your load +path. This executable contains the following lines: + +```ruby +version = ">= 0" +load Gem.bin_path('railties', 'rails', version) +``` + +If you try out this command in a Rails console, you would see that this loads +`railties/bin/rails`. A part of the file `railties/bin/rails.rb` has the +following code: + +```ruby +require "rails/cli" +``` + +The file `railties/lib/rails/cli` in turn calls +`Rails::AppRailsLoader.exec_app_rails`. + +### `railties/lib/rails/app_rails_loader.rb` + +The primary goal of the function `exec_app_rails` is to execute your app's +`bin/rails`. If the current directory does not have a `bin/rails`, it will +navigate upwards until it finds a `bin/rails` executable. Thus one can invoke a +`rails` command from anywhere inside a rails application. + +For `rails server` the equivalent of the following command is executed: + +```bash +$ exec ruby bin/rails server +``` ### `bin/rails` |