Only allow one living monster_spawn per location

1 files changed, 8 insertions, 0 deletions

diff --git a/app/models/monster_spawn.rb b/app/models/monster_spawn.rb
index 5162cc6..42db98a 100644
--- a/app/models/monster_spawn.rb
+++ b/app/models/monster_spawn.rb
@@ -7,6 +7,7 @@ class MonsterSpawn < ApplicationRecord
   after_create :send_chat_message
 
   validates :starting_hp, presence: true, numericality: { greater_than_or_equal_to: 1, only_integer: true }
+  validate :one_living_leviathan_per_location, on: :create
 
   def alive?
     self.remaining_hp > 0
@@ -28,4 +29,11 @@ class MonsterSpawn < ApplicationRecord
         ChatRoomChannel.broadcast_chat_message(chat_message)
       end
     end
+
+    def one_living_leviathan_per_location
+      # TODO: Don't load into memory
+      if location.monster_spawns.find { |ms| ms.alive? && ms != self }
+        errors.add(:chat, "A location can only have one monster spawn at a time.")
+      end
+    end
 end