Add model and validation for scoped tags join table

Author: polypixeldev

app/models/event.rb

@@ -376,7 +376,8 @@ def ancestor_organizer_positions
   has_many :tags, -> { includes(:hcb_codes) }
   has_and_belongs_to_many :event_tags
 
-  has_and_belongs_to_many :event_scoped_tags, class_name: "Event::ScopedTag", association_foreign_key: :event_scoped_tag_id
+  has_many :event_scoped_tags_events, class_name: "Event::ScopedTagsEvent"
+  has_many :scoped_tags, through: :event_scoped_tags_events, source: :event_scoped_tag
 
   has_many :pinned_hcb_codes, -> { includes(hcb_code: [:canonical_transactions, :canonical_pending_transactions]) }, class_name: "HcbCode::Pin"
 

app/models/event/scoped_tag.rb

@@ -11,7 +11,8 @@
 #
 class Event
   class ScopedTag < ApplicationRecord
-    has_and_belongs_to_many :events, foreign_key: :event_scoped_tag_id, inverse_of: :scoped_tags
+    has_many :event_scoped_tags_events, foreign_key: :event_scoped_tag_id, inverse_of: :event_scoped_tag, class_name: "Event::ScopedTagsEvent"
+    has_many :events, through: :event_scoped_tags_events
 
   end
 

app/models/event/scoped_tags_event.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: event_scoped_tags_events
+#
+#  created_at          :datetime         not null
+#  updated_at          :datetime         not null
+#  event_id            :bigint           not null
+#  event_scoped_tag_id :bigint           not null
+#
+# Indexes
+#
+#  idx_on_event_scoped_tag_id_event_id_4b716d1ac0         (event_scoped_tag_id,event_id) UNIQUE
+#  index_event_scoped_tags_events_on_event_id             (event_id)
+#  index_event_scoped_tags_events_on_event_scoped_tag_id  (event_scoped_tag_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (event_id => events.id)
+#  fk_rails_...  (event_scoped_tag_id => event_scoped_tags.id)
+#
+class Event
+  class ScopedTagsEvent < ApplicationRecord
+    belongs_to :event
+    belongs_to :event_scoped_tag, class_name: "Event::ScopedTag"
+
+    validate :event_is_subevent
+
+    private
+
+    def event_is_subevent
+      if event.parent_id.nil?
+        errors.add(:event, "must be a subevent to be tagged with a scoped tag")
+      end
+    end
+
+  end
+
+end