ruby-on-rails – 为什么“rails s”从应用程序目录中工作？

另外我建了一些其他的应用程序.我检查了这些,Rails服务器适用于所有这些应用程序.这是唯一一个我无法启动的地方.

输出轨道：

/Users/jmcrist/.rvm/gems/ruby-2.0.0-p247/bin/rails

轨道输出s：

MacBook-Pro:first_app jmcrist$rails s
Usage:
  rails new APP_PATH [options]

Options:
  -r,[--ruby=PATH]              # Path to the Ruby binary of your choice
                                 # Default: /Users/jmcrist/.rvm/rubies/ruby-2.0.0-p247/bin/ruby
  -b,[--builder=BUILDER]        # Path to a application builder (can be a filesystem path or URL)
  -m,[--template=TEMPLATE]      # Path to an application template (can be a filesystem path or URL)
      [--skip-gemfile]           # Don't create a Gemfile
      [--skip-bundle]            # Don't run bundle install
  -G,[--skip-git]               # Skip Git ignores and keeps
  -O,[--skip-active-record]     # Skip Active Record files
  -S,[--skip-sprockets]         # Skip Sprockets files
  -d,[--database=DATABASE]      # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db/sqlserver/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc)
                                 # Default: sqlite3
  -j,[--javascript=JAVASCRIPT]  # Preconfigure for selected JavaScript library
                                 # Default: jquery
  -J,[--skip-javascript]        # Skip JavaScript files
      [--dev]                    # Setup the application with Gemfile pointing to your Rails checkout
      [--edge]                   # Setup the application with Gemfile pointing to Rails repository
  -T,[--skip-test-unit]         # Skip Test::Unit files
      [--old-style-hash]         # Force using old style hash (:foo => 'bar') on Ruby >= 1.9

Runtime options:
  -f,[--force]    # Overwrite files that already exist
  -p,[--pretend]  # Run but do not make any changes
  -q,[--quiet]    # Suppress status output
  -s,[--skip]     # Skip files that already exist

Rails options:
  -h,[--help]     # Show this help message and quit
  -v,[--version]  # Show Rails version number and quit

Description:
    The 'rails new' command creates a new Rails application with a default
    directory structure and configuration at the path you specify.

    You can specify extra command-line arguments to be used every time
    'rails new' runs in the .railsrc configuration file in your home directory.

    Note that the arguments specified in the .railsrc file don't affect the
    defaults values shown above in this help message.

Example:
    rails new ~/Code/Ruby/weblog

    This generates a skeletal Rails installation in ~/Code/Ruby/weblog.
    See the README in the newly created application to get going.

我正在通过Hartl的Rails教程,他对gemfile做了很多修改.我想知道这是否可能是原因？

source 'https://rubygems.org'

gem 'rails','3.2.13'

group :development do
  gem 'sqlite3','1.3.5'
end


# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails','3.2.5'
  gem 'coffee-rails','3.2.2'

  gem 'uglifier','1.2.3'
end

gem 'jquery-rails','2.0.2'

group :production do
  gem 'pg','0.12.2'
end