Use snake_case for method names

app/helpers/documentables_helper.rb

@@ -9,7 +9,7 @@ module DocumentablesHelper
   end
 
   def max_file_size(documentable)
-    bytesToMeg(documentable.class.max_file_size)
+    bytes_to_mega(documentable.class.max_file_size)
   end
 
   def accepted_content_types(documentable)

app/helpers/documents_helper.rb

@@ -8,7 +8,7 @@ module DocumentsHelper
     document.errors[:attachment].join(', ') if document.errors.key?(:attachment)
   end
 
-  def bytesToMeg(bytes)
+  def bytes_to_mega(bytes)
     bytes / Numeric::MEGABYTE
   end