[Exec] rails generate model Relationship follower_id:integer followed_id:integer
[Add] Adding indices for the relationships table.
[Exec] bundle exec rake db:migrate
[Add] Testing Relationship creation and attributes.
[Add] Testing for the user.relationships attribute.
[Add] Implementing the user/relationships has_many association.
[Add] Testing the user/relationships belongs_to association.
[Add] Adding the belongs_to associations to the Relationship model.
[Add] Testing the Relationship model validations.
[Add] Adding the Relationship model validations.
[Add] A test for the user.followed_users attribute.
[Add] Adding the User model followed_users association.
[Add] Tests for some "following" utility methods.
[Add] The following? and follow! utility methods.
[Add] A test for unfollowing a user.
[Add] Unfollowing a user by destroying a user relationship.
[Add] Testing for reverse relationships.
[Add] Implementing user.followers using reverse relationships.
[Add] Adding following/follower relationships to the sample data.
[Add] Adding following and followers actions to the Users controller.