Introduce Booths for admin

app/models/booth.rb

@@ -0,0 +1,75 @@
+class Booth < ActiveRecord::Base
+  include ActiveRecord::Transitions
+
+  belongs_to :conference
+  has_many :booth_requests, dependent: :destroy
+  has_many :users, through: :booth_requests
+
+  has_one :submitter_booth_user, -> { where(role: 'submitter') }, class_name: 'BoothRequest'
+  has_one  :submitter, through: :submitter_booth_user, source: :user
+
+  has_many :responsibles_booth_user, -> { where(role: 'responsible') }, class_name: 'BoothRequest'
+  has_many :responsibles, through: :responsibles_booth_user, source: :user
+
+  validates :title,
+            uniqueness: { case_sensitive: false },
+            presence: true
+
+  validates :description,
+            :reasoning,
+            :state,
+            :responsibles,
+            :conference_id,
+            :website_url,
+            :submitter_relationship,
+            presence: true
+
+  mount_uploader :picture, PictureUploader, mount_on: :logo_link
+
+  state_machine initial: :new do
+    state :new
+    state :withdrawn
+    state :to_accept
+    state :accepted
+    state :to_reject
+    state :rejected
+    state :canceled
+
+    event :restart do
+      transitions to: :new, from: [:withdrawn, :to_accept, :to_reject, :canceled]
+    end
+    event :withdraw do
+      transitions to: :withdrawn, from: [:new, :to_accept, :accepted, :to_reject, :rejected]
+    end
+    event :to_accept do
+      transitions to: :to_accept, from: [:new, :to_reject]
+    end
+    event :to_reject do
+      transitions to: :to_reject, from: [:new, :to_accept]
+    end
+    event :accept do
+      transitions to: :accepted, from: [:new, :to_accept]
+    end
+    event :reject do
+      transitions to: :rejected, from: [:new, :to_reject]
+    end
+    event :cancel do
+      transitions to: :canceled, from: [:accepted, :rejected]
+    end
+  end
+
+  def transition_possible?(transition)
+    self.class.state_machine.events_for(current_state).include?(transition)
+  end
+
+  def update_state(transition, _notice)
+    alert = ''
+    begin
+      send(transition)
+      save
+    rescue Transitions::InvalidTransition => e
+      alert = "Update state failed. #{e.message}"
+    end
+    alert
+  end
+end