Dear Laurence,
(I'm sending this email also to the product-developers list)
time ago, I got from you some useful suggestions about the use of
collective.mercury and collective.tin
After then, I was able to develop a nice application exploiting a
(restructured) legacy database, allowing to edit, browse, search and
aggregate the data.
The database schema includes one main table (personal data) and a dozen
support tables for coding closed-choice options.
since I am new to some concepts and tools (e.g. formlib), I've spent much
time in developing the UI in the Five-Plone3 environment, without
Archetypes.
I'm using the version of last June of collective.tin (revision 66894) to
avoid problems with z3c.saconfig
Going on, I was appeciating more and more the value inside sqlalchemy,
collective.lead and collective.tin
As to the last one, I realized that it contains much much more than is
documented in your tutorial and than is used by the Timesheets demo
application.
For example, that it is is enough to declare that a container class
implements the IDeleteDeleted interface to enable editing of the items.
Now I have some major difficulty in understanding and activating the
versioning functionality.
Versioning per se could be an (appealing) optional.
But I need also to associate some dublincore metadata (such as Creator,
Creation date, Modification date) with the items in the main table of the
schema.
And it seems that collective.tin takes those metadata from the workflow
history.
I understand that I have to
- create additional tables and classes for accomodating previous versions of
the items and the workflow history
- define Table classes for those additional tables, add columns mirroring
those of the item Table, new keys and external keys
- add some attributes to the container class ("intermediary info")
- add some "implements" statements to the item class and the container
class.
But currentlty I'm not able to go beyond that, without some help.
Would you be so kind to give to me some more cues?
Or, perhaps, you could point at some more complete sample code, making use
of the versioning features.
Thank you very much in advance, Giovanni Toffoli
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