Setup booth group mvc

app/models/booth.rb

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

app/models/booth_group.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class BoothGroup < ApplicationRecord
+  belongs_to :program, touch: true
+  has_paper_trail ignore: [:updated_at], meta: { conference_id: :conference_id }
+  has_many :booths, dependent: :restrict_with_error
+
+  accepts_nested_attributes_for :booths
+
+  validates :name, presence: true
+  validates :color, format: /\A#[0-9A-F]{6}\z/
+  before_validation :capitalize_color
+
+  private
+
+  def capitalize_color
+    self.color = color.upcase if color.present?
+  end
+
+  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_groups, through: :program
 
   has_many :surveys, as: :surveyable, dependent: :destroy do
     def for_registration
@@ -683,9 +684,10 @@ class Conference < ApplicationRecord
     # we have different start indices for every collection to generate a
     # different color for every of them.
     start_index = {
-      tracks: (program.tracks.count + 1),
-      levels: (program.difficulty_levels.count + 51),
-      types:  (program.event_types.count + 101)
+      tracks:       (program.tracks.count + 1),
+      levels:       (program.difficulty_levels.count + 51),
+      types:        (program.event_types.count + 101),
+      booth_groups: (program.booth_groups.count + 151)
     }
     next_color(start_index[collection])
   end

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_groups, dependent: :destroy
   has_many :tracks, dependent: :destroy
   has_many :difficulty_levels, dependent: :destroy
   has_many :schedules, dependent: :destroy