[Ruby on Rails] Reference Articles for User Authentication Engine "Devise"

Reference articles for introducing Devise into a Ruby on Rails application.

[Ruby on Rails] Overriding Devise's current_user method

Overriding Devise's current_user with alias_method to always include the user's Role.

[Ruby] How to Get Currently Logged-in User ID with User Authentication Engine "Devise"

Getting the currently logged-in user's ID from Devise via current_user.id.

[Ruby on Rails] How to Display Error Messages for Devise Login Process

Adding alert output to Devise's sessions/new view to show login error messages.

[Ruby on Rails] Created update_without_password! Method in Devise that Raises Exception on Save Failure

A record of adding an exception-raising update_without_password! method that Devise itself does not provide, defined on the User model.

[Ruby][FactoryGirl] Could not find a valid mapping for #<User

A record of running into the "Could not find a valid mapping for User" error with FactoryGirl and Devise.