add dynamic documents

app/models/dynamic_document_version.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: dynamic_document_versions
+#
+#  id                  :bigint           not null, primary key
+#  areas               :text             not null
+#  sha1                :string           not null
+#  created_at          :datetime         not null
+#  updated_at          :datetime         not null
+#  dynamic_document_id :bigint           not null
+#
+# Indexes
+#
+#  idx_on_dynamic_document_id_sha1_3503adf557  (dynamic_document_id,sha1) UNIQUE
+#
+# Foreign Keys
+#
+#  fk_rails_...  (dynamic_document_id => dynamic_documents.id)
+#
+class DynamicDocumentVersion < ApplicationRecord
+  belongs_to :dynamic_document
+
+  has_one_attached :document
+
+  attribute :areas, :string, default: -> { [] }
+
+  serialize :areas, coder: JSON
+end