one meeting per room

app/models/room.rb

@@ -3,9 +3,10 @@ class Room < ApplicationRecord
   before_create :set_uid
 
   belongs_to :user
-  has_many :meetings
+  has_one :meeting
 
   def owned_by?(user)
+    return false if user.nil?
     user.room == self
   end
 

app/models/user.rb

@@ -68,7 +68,7 @@ class User < ApplicationRecord
 
   # Initializes a room for the user.
   def initialize_room
-    self.room = Room.new
-    self.save!
+    room = Room.create(user_id: self.id)
+    Meeting.create(room_id: room.id, name: "Example")
   end
 end