From my experience you want:

Product to-many ProductAttachments to-one Attachment

now you can put as much meta data on ProductAttachments and never touch 
ERAttachments.

I am doing this in a very simple test app, that I can send you if you want.

Ted



On Sep 27, 2014, at 10:11 AM, Markus Ruggiero <mailingli...@kataputt.com> wrote:

> I am converting a legacy D2W application to Modern style. In the old 
> application the create page for a given entity was frozen and then hand 
> edited. The application implements something similar to ERAttachment and in 
> the frozen edit page there is a plain WOFileUpload button. All the files go 
> into the same directory (unlike with ERAttachment, where the files are stored 
> in a multi-level subdirectory structure).
> 
> I want to do as much as possible without custom components (at least no page 
> level components). I can easily do the Create/Edit/List page configuration 
> for the given entity, but I am struggling with the file upload. I don't think 
> I can use ERAttachment, or can I? My data model is Product <-->> Attachment 
> (yes, the name already maches). Attachment has just a to-one relationship to 
> product and a file name attribute (path is "hard coded" via properties file. 
> It is is certainly possible to extend the existing Attachment entity with 
> more fields, but how wold I handle the differing way of storing the attached 
> files? This is a legacy application where I cannot just simply alter the file 
> system layout. And there are already several 1000's of attachments.
> 
> Thanks for any input
> ---markus---
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