db/migrate/20210608001838_add_starting_hp_to_monster_spawns.rb


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class AddStartingHpToMonsterSpawns < ActiveRecord::Migration[6.1]
  def change
    add_column :monster_spawns, :starting_hp, :integer
    MonsterSpawn.all.each do |ms|
      ms.update(starting_hp: ms.monster.max_hp)
    end
  end
end