Add migration for converting whn to markdown

db/migrate/20231201144634_populate_what_happens_next_markdown.rb

@@ -0,0 +1,51 @@
+class PopulateWhatHappensNextMarkdown < ActiveRecord::Migration[7.0]
+  include ActionView::Helpers::TextHelper
+
+  def change
+    reversible do |direction|
+      Form.find_each do |form|
+        direction.up do
+          formatted_html = simple_format(
+            form.what_happens_next_text,
+            {},
+            sanitize: true,
+            sanitize_options: {
+              tags: %w[a ol ul li p],
+              attributes: %w[href class rel target title],
+            },
+          )
+          markdown = ReverseMarkdown.convert(formatted_html).strip
+          form.what_happens_next_markdown = form.what_happens_next_text.blank? ? "" : markdown
+        end
+        direction.down do
+          form.what_happens_next_markdown = nil
+        end
+
+        form.made_live_forms.each do |made_live_form|
+          form_blob = JSON.parse(made_live_form.json_form_blob, symbolize_names: true)
+
+          direction.up do
+            formatted_html = simple_format(
+              form_blob[:what_happens_next_text],
+              {},
+              sanitize: true,
+              sanitize_options: {
+                tags: %w[a ol ul li p],
+                attributes: %w[href class rel target title],
+              },
+            )
+            markdown = ReverseMarkdown.convert(formatted_html).strip
+            form_blob[:what_happens_next_markdown] = form_blob[:what_happens_next_text].blank? ? "" : markdown
+          end
+          direction.down do
+            form_blob[:what_happens_next_markdown] = nil
+          end
+
+          made_live_form.update!(json_form_blob: form_blob.to_json)
+        end
+
+        form.save!
+      end
+    end
+  end
+end