create relationships table
User/relationship associations.
adding relationship model validations.
add follwed_users attributes
adding following? and follow! utility methods.
Adding unfollow! method.
add reverse relationships.
Adding following/follower relationships to the sample data.
Adding follower stats to the Home page.
Following and followers pages.
A working follow button the standard way.
a working follow button with Ajax
a first feed implementation.
Improving from_users_followed_by.
The final implementation of from_users_followed_by.