Set up association and models

app/models/booth.rb

@@ -7,6 +7,7 @@ class Booth < ApplicationRecord
   attr_accessor :invite_responsible
 
   belongs_to :conference
+  belongs_to :booth_type
   has_many :booth_requests, dependent: :destroy
   has_many :users, through: :booth_requests
 

app/models/booth_type.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class BoothType < ApplicationRecord
+  belongs_to :program, touch: true
+  has_many :booths, dependent: :restrict_with_error
+
+  has_paper_trail meta:   { conference_id: :conference_id },
+                  ignore: %i[updated_at]
+
+  validates :title, presence: true
+
+  private
+
+  def conference_id
+    program.conference_id
+  end
+end

app/models/conference.rb

@@ -52,6 +52,7 @@ class Conference < ApplicationRecord
            through: :program,
            source:  :events
   has_many :event_types, through: :program
+  has_many :booth_types, through: :program
 
   has_many :surveys, as: :surveyable, dependent: :destroy do
     def for_registration

app/models/program.rb

@@ -9,6 +9,7 @@ class Program < ApplicationRecord
 
   has_many :cfps, dependent: :destroy
   has_many :event_types, dependent: :destroy
+  has_many :booth_types, dependent: :destroy
   has_many :tracks, dependent: :destroy
   has_many :difficulty_levels, dependent: :destroy
   has_many :schedules, dependent: :destroy

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_06_03_143107) do
+ActiveRecord::Schema.define(version: 2019_08_17_094930) do
 
   create_table "answers", force: :cascade do |t|
     t.string "title"
@@ -28,6 +28,15 @@ ActiveRecord::Schema.define(version: 2019_06_03_143107) do
     t.index ["user_id"], name: "index_booth_requests_on_user_id"
   end
 
+  create_table "booth_types", force: :cascade do |t|
+    t.integer "program_id"
+    t.string "title", null: false
+    t.string "description"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["program_id"], name: "index_booth_types_on_program_id"
+  end
+
   create_table "booths", force: :cascade do |t|
     t.string "title"
     t.text "description"
@@ -39,6 +48,8 @@ ActiveRecord::Schema.define(version: 2019_06_03_143107) do
     t.integer "conference_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.integer "booth_type_id"
+    t.index ["booth_type_id"], name: "index_booths_on_booth_type_id"
   end
 
   create_table "cfps", force: :cascade do |t|