Migrations

generators.rb

$ rails g model user email

=begin
create_table :users do |t|
  t.string :email

  t.timestamp
end
=end

$ rails g model user email:index

=begin
create_table :users do |t|
  t.string :email

  t.timestamp
end
add_index :users, :email
=end

$ rails g model user email:uniq

=begin
create_table :users do |t|
  t.string :email

  t.timestamp
end
add_index :users, :email, unique: true
=end