col	data_type	detail
id	integer	not null, primary key
username	string	not null, indexed, unique
pw_digest	string	not null
sess_tok	string	not null, indexed, unique
first_n	string	not null
last_n	string	not null
created@	datetime	not null
updated@	datetime	not null

• A User has many photos. A User has many albums. A User has many comments.

col	data_type	detail
title	string	not null
id	integer	not null, primary key
user_id	integer	not null, indexed, f-key
desc.	text
created@	datetime	not null
updated@	datetime	not null

• A photo belongs to a User. A photo has many comments. A photo has many tags.

col	data_type	detail
id	integer	not null, primary key
title	string	not null
user_id	integer	not null, indexed, f-key
descript	text
created@	datetime	not null
updated@	datetime	not null

• An Album belongs to a User. An Album has many Photos.

col	data_type	detail
id	integer	not null, primary key
user_id	integer	not null, indexed, f-key
photo_id	integer	not null, indexed, f-key
body	text	not null
created@	datetime	not null
updated@	datetime	not null

• A Comment belongs to a User. A Comment belongs to a Photo.

col	data_type	detail
album_id	integer	not null, f-key
photo_id	integer	not null, indexed, f-key

has_many :photos,
class_name: :Photo,
foreign_key: :user_id

has_many :albums,
class_name: :Album,
foreign_key: :user_id

has_many :comments,
class_name: :User,
foreign_key: :user_id
end

belongs_to :user,
class_name: :User,
foreign_key: :user_id

belongs_to :album,
class_name: :Album,
foreign_key: :album_id

has_many :comments,
class_name: :Comment,
foreign_key: :photo_id

end

belongs_to :user,
class_name: :User,
foreign_key: :user_id

has_many :photos,
class_name: :Photo,
foreign_key: :album_id
end

belongs_to :user,
class_name: :User,
foreign_key: :user_id

belongs_to :photo,
class_name: :Photo,
foreign_key: :photo_id
end