Remove NULL byte before saving strings

app/models/application_record.rb

@@ -4,6 +4,7 @@ class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
 
   before_validation :strip_strings
+  before_validation :remove_null_bytes
 
   def strip_strings
     # trim whitespace from beginning and end of string attributes
@@ -16,6 +17,15 @@ class ApplicationRecord < ActiveRecord::Base
     end
   end
 
+  def remove_null_bytes
+    # remove null bytes from string attributes
+    attribute_names.each do |name|
+      if send(name.to_sym).respond_to?(:tr)
+        send("#{name}=".to_sym, send(name).tr("\0", ''))
+      end
+    end
+  end
+
   def self.ransackable_associations(_auth_object = nil)
     []
   end