Setup booth group mvc

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