rail migations

change_column_to_user.rb

class ChangeColumnToUser < ActiveRecord::Migration[5.0]
  def change
    # 追加
    add_column :users, :piyo, :string
    add_column :users, :piyo2, :string
    # 削除
    remove_column :users, :piyo2, :string
    # rename
    rename_column :users, :name_x, :name
  end
end

create_user2.rb

class CreateUsers2 < ActiveRecord::Migration[5.0]
  def change
    create_table :users do |t|
      t.string :uuid
      t.string :name_x

      t.timestamps
    end
  end
end

create_users.rb

class CreateUsers < ActiveRecord::Migration[5.0]
  def change
    create_table :users do |t|
      t.string :uuid
      t.string :name

      t.timestamps
    end
  end
end

drop_user.rb

class DropUser < ActiveRecord::Migration[5.0]
  def change
    drop_table :users
  end
end