键入“rails 控制台”无法启动？

Question

I typed this:

>rails console

and got this:

Usage:
  rails new APP_PATH [options]

Options:
      [--skip-gemfile]        # Don't create a Gemfile
  -d, [--database=DATABASE]   # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db)
                              # Default: sqlite3
..
..
.

I'm following along the rails tutorial and got stuck on this.

I have rails 3.0 installed.

Answer 1

In case anyone else hits this, my symptoms were:

I'd deployed my application with Capistrano 3

I cd'd into my application directory, and rails console didn't work

Turned out I'd included the bin folder as a symlinked directory in my cap deploy, as follows:

set :linked_dirs, %w{log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}

... and my bin directory in 'shared' was empty.

Two fixes:

• Ensure your linked bin directory has the correct contents (have a look inside your #{RAILS_ROOT}/bin directory for what this is, OR
• Don't symlink bin

I then re-deployed and it works.

Answer 2

Are you in the root path of your app when you type $ rails console ?

Tip: $ rails c is a shortcut for $ rails console

Answer 3

I just ran into this same problem while upgrading a Rails 2 app to Rails 3. When running rails console (or really rails [anything] ) in my app's root directory, I would see general rails new usage output (as Blankman referenced in the original question).

The problem was that I had not removed the old Rails 2 scripts from the script directory. After removing everything in the script directory and adding the script/rails file that is auto-generated in each new Rails 3 app, the rails command now works as expected.

In order to get the latest contents of the script/rails file, generate a new app and copy the file into your Rails 2 app that you're upgrading. As of Rails 3.0.7, here's what's in this file:

#!/usr/bin/env ruby
# This command will automatically be run when you run "rails" with Rails 3 gems installed from the root of your application.

APP_PATH = File.expand_path('../../config/application',  __FILE__)
require File.expand_path('../../config/boot',  __FILE__)
require 'rails/commands'

Answer 4

当我将 Rails 2 升级到 3 时遇到了这个问题，并且能够按照 Nick 所说的进行修复，然后还运行bundle exec rails console production 。

Answer 5

In Rails 2.3.x the command is script/console within a given Rails application directory to start a Ruby console with the default Rails environment loaded into memory. Not sure if Rails 3.0 is the same or not.

Answer 6

You need to into the project directory and command rails console eg:

D:\workspace\>rails blog
D:\workspace\>cd blog
D:\workspace\blog\> rails c
loading en...

Answer 7

are you in a rails 3 app directory?

do you have multiple versions of rails installed?

try checking 'which rails', and make sure this is a rails 3 executable you are running - that usage looks like rails 2.x.

Answer 8

You are running the correct command ( rails console ), but you are most likely not in the working directory for this application. Change directory to the root of your rails application (beneath which you will find /scripts , /app , etc.), and the command should work as desired.

Note: Using script/console or ruby script/console is for earlier versions of Rails.

Answer 9

在我的情况下bin/rails c处理了我的应用程序根文件夹

Answer 10

You need two gems "rdoc" and "rb-readline After that add this gems in Gemfile and bundle install Console is working fine

Arch-linux or Manjaro