class User < ActiveRecord::Base
end

class User < ActiveRecord::Base
has_many :books
end

class User < ActiveRecord::Base
set_table_name 'user'
set_primary_key 'pkey'
end

ITPro

• if a==b then; obj.m(); end
• a==b && obj.m
• obj.m if a==b

DB (Model)
Scaffold
HTML

DB (Model)
Scaffold
HTML

class AddNick < ActiveRecord::Migration
def self.up
add_column :users, :nick, :text
end
def self.down
remove_column :users, :nick
end
end