Adding support for smart paperclip field names to admin form field

rendering

Author: johngrimes

app/helpers/admin/form_helper.rb

@@ -383,6 +383,8 @@ def attribute_disabled?(attribute)
   def typus_preview(item, attribute)
 
     # typus_preview(attribute).html_safe! unless @item.send(attribute).blank?
+    #
+    return unless item.attachment_present?(attribute)
 
     attachment = attribute.split("_file_name").first
     file_preview = Typus::Configuration.options[:file_preview]
@@ -430,4 +432,4 @@ def expand_tree_into_select_field(items, attribute)
     end
   end
 
-end
+end

app/views/admin/templates/_file.html.erb

@@ -2,7 +2,7 @@
 
   attachment = attribute.split('_file_name').first
 
-  if !@item.send(attribute).blank?
+  if @item.attachment_present?(attribute)
     label_text << <<-HTML
  <small>#{link_to _("Remove file"), { :action => 'detach', 
                                       :id => @item, 

lib/typus/active_record.rb

@@ -349,6 +349,18 @@ def owned_by?(user)
       send(Typus.user_fk) == user.id
     end
 
+    # Determine if file attachment is blank, taking into account that
+    # user may be using a Paperclip attachment without a _file_name
+    # suffix
+    def attachment_present?(attribute)
+      attribute = attribute.to_s
+      if attribute.index('_file_name')
+        !send(attribute).blank?
+      elsif respond_to?("#{attribute}_file_name")
+        !send("#{attribute}_file_name").blank?
+      end
+    end
+
   end
 
 end