Add CRUD operations for Programming Groups

* Correct sorting in table
* Modify page when nested in exercises
* Fix links between pages
* Link from statistics page to programming_groups/index
* Link from submission page to programming_groups/<id>
* Allow filtering for exercise ID on ProgrammingGroup#index
* Add search fields for internal and external user id on pg/index

app/models/exercise.rb

@@ -36,6 +36,7 @@ class Exercise < ApplicationRecord
   has_many :request_for_comments
 
   scope :with_submissions, -> { where('id IN (SELECT exercise_id FROM submissions)') }
+  scope :with_programming_groups, -> { where('id IN (SELECT exercise_id FROM programming_groups)') }
 
   validate :valid_main_file?
   validate :valid_submission_deadlines?
@@ -612,7 +613,7 @@ class Exercise < ApplicationRecord
   end
 
   def self.ransackable_attributes(_auth_object = nil)
-    %w[title internal_title]
+    %w[title id internal_title]
   end
 
   def self.ransackable_associations(_auth_object = nil)

app/models/programming_group.rb

@@ -9,10 +9,10 @@ class ProgrammingGroup < ApplicationRecord
   has_many :internal_users, through: :programming_group_memberships, source_type: 'InternalUser', source: :user
   has_many :testruns, through: :submissions
   has_many :runners, as: :contributor, dependent: :destroy
-  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_many :events, dependent: :destroy
+  has_many :events_synchronized_editor, class_name: 'Event::SynchronizedEditor', dependent: :destroy
+  has_many :pair_programming_exercise_feedbacks, dependent: :destroy
+  has_many :pair_programming_waiting_users, dependent: :destroy
   belongs_to :exercise
 
   validate :min_group_size
@@ -20,11 +20,6 @@ class ProgrammingGroup < ApplicationRecord
   validate :no_erroneous_users
   accepts_nested_attributes_for :programming_group_memberships
 
-  def initialize(attributes = nil)
-    @erroneous_users = []
-    super
-  end
-
   def external_user?
     false
   end
@@ -76,15 +71,27 @@ class ProgrammingGroup < ApplicationRecord
   def users=(users)
     self.internal_users = []
     self.external_users = []
-    users.each do |user|
-      next @erroneous_users << user unless user.is_a?(User)
+    users&.each do |user|
+      next erroneous_users << user unless user.is_a?(User)
 
       add(user)
     end
   end
 
+  def self.ransackable_associations(_auth_object = nil)
+    %w[exercise programming_group_memberships]
+  end
+
+  def self.ransortable_attributes(_auth_object = nil)
+    %w[id created_at]
+  end
+
   private
 
+  def erroneous_users
+    @erroneous_users ||= []
+  end
+
   def min_group_size
     if users.size < 2
       errors.add(:base, :size_too_small)
@@ -98,7 +105,7 @@ class ProgrammingGroup < ApplicationRecord
   end
 
   def no_erroneous_users
-    @erroneous_users.each do |partner_id|
+    erroneous_users.each do |partner_id|
       errors.add(:base, :invalid_partner_id, partner_id:)
     end
   end

app/models/programming_group_membership.rb

@@ -12,4 +12,8 @@ class ProgrammingGroupMembership < ApplicationRecord
       errors.add(:base, :already_exists, id_with_type: user.id_with_type)
     end
   end
+
+  def self.ransackable_associations(_auth_object = nil)
+    %w[user]
+  end
 end

app/models/user.rb

@@ -111,9 +111,9 @@ class User < ApplicationRecord
 
   def self.ransackable_attributes(auth_object)
     if auth_object.present? && auth_object.admin?
-      %w[name email external_id consumer_id platform_admin]
+      %w[name email external_id consumer_id platform_admin id]
     else
-      %w[name external_id]
+      %w[name external_id id]
     end
   end
 end