Add waiting room to create programming groups (#1919)

Co-authored-by: Sebastian Serth <Sebastian.Serth@hpi.de>

app/models/exercise.rb

@@ -32,6 +32,7 @@ class Exercise < ApplicationRecord
   has_many :external_users, source: :contributor, source_type: 'ExternalUser', through: :submissions
   has_many :internal_users, source: :contributor, source_type: 'InternalUser', through: :submissions
   has_many :programming_groups
+  has_many :pair_programming_waiting_users
 
   scope :with_submissions, -> { where('id IN (SELECT exercise_id FROM submissions)') }
 

app/models/pair_programming_waiting_user.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class PairProgrammingWaitingUser < ApplicationRecord
+  include Creation
+
+  belongs_to :exercise
+  belongs_to :programming_group, optional: true
+
+  enum status: {
+    waiting: 0,
+    joined_pg: 1,
+    disconnected: 2,
+    worked_alone: 3,
+    created_pg: 4,
+  }, _prefix: true
+
+  validates :user_id, uniqueness: {scope: %i[exercise_id user_type]}
+  validates :programming_group_id, presence: true, if: -> { status_joined_pg? || status_created_pg? }
+
+  after_save :capture_event
+
+  def capture_event
+    Event.create(category: 'pp_matching', user:, exercise:, data: status.to_s)
+  end
+end

app/models/programming_group.rb

@@ -12,6 +12,7 @@ class ProgrammingGroup < ApplicationRecord
   has_many :events
   has_many :events_synchronized_editor, class_name: 'Event::SynchronizedEditor'
   has_many :pair_programming_exercise_feedbacks
+  has_many :pair_programming_waiting_users
   belongs_to :exercise
 
   validate :min_group_size

app/models/user.rb

@@ -25,6 +25,7 @@ class User < ApplicationRecord
   has_many :events
   has_many :events_synchronized_editor, class_name: 'Event::SynchronizedEditor'
   has_many :pair_programming_exercise_feedbacks
+  has_many :pair_programming_waiting_users
   has_one :codeharbor_link, dependent: :destroy
   accepts_nested_attributes_for :user_proxy_exercise_exercises