Migrate database and models for study-group-based authorization

app/models/authentication_token.rb

@@ -4,6 +4,7 @@ require 'securerandom'
 
 class AuthenticationToken < ApplicationRecord
   include Creation
+  belongs_to :study_group, optional: true
 
   def self.generate!(user)
     create!(

app/models/consumer.rb

@@ -2,6 +2,7 @@
 
 class Consumer < ApplicationRecord
   has_many :users
+  has_many :study_groups, dependent: :destroy
 
   scope :with_internal_users, -> { where('id IN (SELECT DISTINCT consumer_id FROM internal_users)') }
   scope :with_external_users, -> { where('id IN (SELECT DISTINCT consumer_id FROM external_users)') }

app/models/study_group.rb

@@ -6,6 +6,8 @@ class StudyGroup < ApplicationRecord
   has_many :internal_users, through: :study_group_memberships, source_type: 'InternalUser', source: :user
   has_many :submissions, dependent: :nullify
   has_many :remote_evaluation_mappings, dependent: :nullify
+  has_many :subscriptions, dependent: :nullify
+  has_many :authentication_tokens, dependent: :nullify
   belongs_to :consumer
 
   def users

app/models/study_group_membership.rb

@@ -4,5 +4,11 @@ class StudyGroupMembership < ApplicationRecord
   belongs_to :user, polymorphic: true
   belongs_to :study_group
 
+  enum role: {
+    learner: 0,
+    teacher: 1,
+  }, _default: :learner, _prefix: true
+
+  validates :role, presence: true
   validates :user_id, uniqueness: {scope: %i[user_type study_group_id]}
 end

app/models/subscription.rb

@@ -3,4 +3,5 @@
 class Subscription < ApplicationRecord
   belongs_to :user, polymorphic: true
   belongs_to :request_for_comment
+  belongs_to :study_group, optional: true
 end