app/jobs/table_simulator_job.rb

@@ -7,7 +7,7 @@ class TableSimulatorJob < ApplicationJob
     engine.add_perturbation(Tables::Swap)
 
     initial_solution = Tables::Distribution.new(min_per_table: 8, max_per_table: 10)
-    initial_solution.random_distribution(Guest.all.shuffle)
+    initial_solution.random_distribution(Guest.potential.shuffle)
 
     engine.initial_solution = initial_solution
 

app/models/guest.rb

@@ -8,9 +8,11 @@ class Guest < ApplicationRecord
     invited: 10,
     confirmed: 20,
     declined: 30,
-    tentative: 40,
+    tentative: 40
   }
 
+  scope :potential, -> { where.not(status: %i[declined considered]) }
+
   def full_name
     "#{first_name} #{last_name}"
   end