Database Schema

users

column name	data type	details
id	integer	not null, primary key
username	string	not null, indexed, unique
email	string	not null, indexed, unique
password_digest	string	not null
session_token	string	not null, indexed, unique
website	string
bio	text
created_at	datetime	not null
updated_at	datetime	not null

• index on username, unique: true
• index on email, unique: true
• index on session_token, unique: true

feeds

column name	data type	details
id	integer	not null, primary key
body	text
author_id	integer	not null, indexed, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• author_id references users
• index on author_id
• attached :photo

comments

column name	data type	details
id	integer	not null, primary key
body	text	not null
feed_id	integer	not null, indexed, foreign key
author_id	integer	not null, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• feed_id references feeds
• author_id references users

likes

column name	data type	details
id	integer	not null, primary key
likeable_id	integer	not null, indexed, foreign key
likeable_type	string	not null, indexed
author_id	integer	not null, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• polymorphic table, likeable_type = feed or comment
• likeable_id references feeds or comments
• author_id references users
• index on [:likeable_id, :likeable_type, :author_id], unique: true

follows

column name	data type	details
id	integer	not null, primary key
user_id	integer	not null, indexed, foreign key
follower_id	integer	not null, indexed, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• user_id references users
• follower_id references users