issue links

app/models/pm_link.rb

@@ -0,0 +1,25 @@
+# == Schema Information
+#
+# Table name: pm_links
+#
+#  id               :integer          not null, primary key
+#  be_linkable_type :string(255)      not null
+#  be_linkable_id   :integer          not null
+#  linkable_type    :string(255)      not null
+#  linkable_id      :integer          not null
+#  created_at       :datetime         not null
+#  updated_at       :datetime         not null
+#
+# Indexes
+#
+#  index_pm_links_on_linkable_id    (linkable_id)
+#  index_pm_links_on_linkable_type  (linkable_type)
+#
+
+class PmLink < ApplicationRecord
+  belongs_to :linkable, polymorphic: true
+
+  def be_linkable
+    be_linkable_type.constantize.find be_linkable_id
+  end
+end