Реализация Page и DataCardWidget

api/app/models/application_record.rb

@@ -0,0 +1,3 @@
+class ApplicationRecord < ActiveRecord::Base
+  primary_abstract_class
+end

api/app/models/channel.rb

@@ -0,0 +1,6 @@
+class Channel < ApplicationRecord
+  self.table_name = "channels"
+  self.inheritance_column = nil
+
+  has_many :histories, -> { order(event_date: :asc) }
+end

api/app/models/history.rb

@@ -0,0 +1,5 @@
+class History < ApplicationRecord
+  self.table_name = "histories"
+
+  belongs_to :channel
+end