Migrate AnomalyNotification to contributor

* Also, this commit aims to fix the (broken) anomaly notifications.

db/migrate/20230821062816_rename_user_to_contributor_in_anomaly_notifications.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class RenameUserToContributorInAnomalyNotifications < ActiveRecord::Migration[7.0]
+  def change
+    # We need to drop and recreate the index because the name would be too long otherwise.
+    # Renaming is not possible because the index can have two different names.
+
+    change_table :anomaly_notifications do |t|
+      t.remove_index %i[user_type user_id]
+      t.rename :user_id, :contributor_id
+      t.rename :user_type, :contributor_type
+    end
+
+    add_index :anomaly_notifications, %i[contributor_type contributor_id], name: 'index_anomaly_notifications_on_contributor'
+  end
+end

db/migrate/20230821062901_add_foreign_keys_to_anomaly_notifications.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class AddForeignKeysToAnomalyNotifications < ActiveRecord::Migration[7.0]
+  def change
+    up_only do
+      # We cannot add a foreign key to a table that has rows that violate the constraint.
+      AnomalyNotification.where.not(exercise_id: Exercise.all.select(:id)).delete_all
+    end
+
+    change_column_null :anomaly_notifications, :contributor_id, false
+    change_column_null :anomaly_notifications, :contributor_type, false
+
+    change_column_null :anomaly_notifications, :exercise_id, false
+    add_foreign_key :anomaly_notifications, :exercises
+
+    change_column_null :anomaly_notifications, :exercise_collection_id, false
+    add_foreign_key :anomaly_notifications, :exercise_collections
+  end
+
+  class AnomalyNotification < ActiveRecord::Base; end
+  class Exercise < ActiveRecord::Base; end
+  class ExerciseCollection < ActiveRecord::Base; end
+end

db/migrate/20230821063101_convert_reason_to_json_in_anomaly_notifications.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class ConvertReasonToJsonInAnomalyNotifications < ActiveRecord::Migration[7.0]
+  def up
+    AnomalyNotification.where("reason LIKE '%value:%'").each do |anomaly_notification|
+      reason = anomaly_notification.reason
+      reason = reason.gsub('value:', '"value":')
+      reason = reason.gsub(/"(\d+\.\d+)"/) {|_| Regexp.last_match(1) }
+      anomaly_notification.update!(reason:)
+    end
+    change_column :anomaly_notifications, :reason, :jsonb, using: 'reason::jsonb'
+  end
+
+  def down
+    change_column :anomaly_notifications, :reason, :string
+  end
+
+  class AnomalyNotification < ActiveRecord::Base; end
+end

db/schema.rb

@@ -10,23 +10,23 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_08_20_182149) do
+ActiveRecord::Schema[7.0].define(version: 2023_08_21_063101) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_trgm"
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
 
   create_table "anomaly_notifications", id: :serial, force: :cascade do |t|
-    t.integer "user_id"
-    t.string "user_type"
-    t.integer "exercise_id"
-    t.integer "exercise_collection_id"
-    t.string "reason"
+    t.integer "contributor_id", null: false
+    t.string "contributor_type", null: false
+    t.integer "exercise_id", null: false
+    t.integer "exercise_collection_id", null: false
+    t.jsonb "reason"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.index ["contributor_type", "contributor_id"], name: "index_anomaly_notifications_on_contributor"
     t.index ["exercise_collection_id"], name: "index_anomaly_notifications_on_exercise_collection_id"
     t.index ["exercise_id"], name: "index_anomaly_notifications_on_exercise_id"
-    t.index ["user_type", "user_id"], name: "index_anomaly_notifications_on_user"
   end
 
   create_table "authentication_tokens", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
@@ -595,6 +595,8 @@ ActiveRecord::Schema[7.0].define(version: 2023_08_20_182149) do
     t.index ["user_type", "user_id"], name: "index_user_proxy_exercise_exercises_on_user"
   end
 
+  add_foreign_key "anomaly_notifications", "exercise_collections"
+  add_foreign_key "anomaly_notifications", "exercises"
   add_foreign_key "authentication_tokens", "study_groups"
   add_foreign_key "community_solution_contributions", "community_solution_locks"
   add_foreign_key "community_solution_contributions", "community_solutions"