Rails g migration doesn't work

Question

When I run the command

rails g migration migration_name

I will get the \"error\" message:

Usage:
  rails new APP         


        

Answer 1

You are not running it inside a rails generated project directory. You are running it outside it.

EDIT: It could also be if the script folder is missing. Or the rails script is missing inside the script folder if you are executing it inside the project folder.

Answer 2

I've got the same, and i fixed by doing :

cd /root/path/to/your/project

bundle install

bundle update

Voilà :)

Answer 3

Try adding a folder called script to your rails root.

in this folder add a file called rails and add to it

APP_PATH = File.expand_path('../../config/application', FILE)

require File.expand_path('../../config/boot', FILE)

require 'rails/commands'

and execute again

rails g migration migration_name