[Fix #1543] Strip html tags from textarea champs

lib/tasks/2018_03_06_clean_html_textareas.rake

@@ -0,0 +1,16 @@
+require Rails.root.join("app", "helpers", "html_to_string_helper")
+
+namespace :'2018_03_06_clean_html_textareas' do
+  task clean: :environment do
+    include ActionView::Helpers::TextHelper
+    include HtmlToStringHelper
+
+    types_de_champ = TypeDeChamp.joins(:champ)
+      .where(type_champ: "textarea")
+      .where("champs.value LIKE '%<%'")
+
+    types_de_champ.find_each do |tdc|
+      tdc.champ.each { |c| c.update_column(:value, html_to_string(c.value)) }
+    end
+  end
+end