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DATABASE SCHEMA

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
biography	text	n/a
session_token	string	null
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

photos

Column name	Data-type	Details
id	integer	unique, indexed,not null primary key
user_id	integer	unique, indexed, foreign_key
description	text	n/a
created_at	datetime	not null
updated_at	datetime	not null

• index on id unique: true
• index on user_id unique: true
• user_id references user

comments

Column name	Data-type	Details
id	integer	not null, unique, indexed, primary key
created_at	datetime	not null
updated_at	datetime	not null
user_id	integer	not null, foreign_key
body	text	n/a
photo_id	integer	not_null, foreign_key

• index on user_id unique: true, null:false
• user_id references user

Likes

Column name	Data-type	Details
id	integer	not null, unique, indexed
user_id	integer	not null, unique, indexed,foreign_key
photo_id	integer	not null
created_at	datetime	not null
updated_at	datetime	not null

• index on user_id unique: true, null: false
• index on user_id unique: true, null: false
• user_id references users

followers

Column name	Data-type	Details
id	integer	not null, primary key
follower_id	integer	not null, foreign_key
follower_user_id	integer	not null, foreign_key
created_at	datetime	not null
updated_at	datetime	not null

• index on user_id unique: true, null: false