Illegal name for migration file

Question

I'm trying to generate a new user model, and I could have sworn that this worked before

$ rails generate migration User.rb

but now it complains that this is illegal. I keep getting an error:

Illegal name for migration file: user.rb (only lower case letters, numbers, and '_' allowed)

As you can see user.rb is only lowercase.

Answer 1

Actually, issue here is with . which you have between User and rb, i.e.: User.rb. If you change it to: rails generate migration Userrb then it should work.

However, you can be more efficient while generating a migration by following a small convention:

• To create users table:

  $ rails generate migration create_users

  or:

  $ rails generate migration CreateUsers

• To have some columns while creating users table:

  $ rails generate migration create_users name:string email:string address:text

  or:

  $ rails generate migration CreateUsers name:string email:string address:text

UPDATE: Apologies for not consider your line: generate a new user model. If you want to generate a model then you can run these convenient commands:

• To create User model which will also create users table migration by default:

  $ rails generate model user

  or:

  $ rails generate model User

• To create User model which will also create users table migration with some attributes by default:

  $ rails generate model user name:string email:string address:text

  or:

  $ rails generate model User name:string email:string address:text

Answer 2

Migrations should be like this.

rails generate migration add_email_to_users email:string

I don't know what are trying to achieve by User.rb. Although refer this doc. Its a good start if you are not aware of how migrations work.

Answer 3

Change to user instead of User.rb.