The Cocoon Wiki's Woody Datatype Reference mentions a "nullable" attribute which presumably controls whether or not a field's selection list contains a null choice. This would be exactly what we want. However, our initial investigation suggests that this "nullable" is not (yet?) implemented. Does that sound right?
No. Having implemented it myself, I can attest that it works as advertised, or at least it did last time I used it.
Our selection list comes from our database.
Maybe the Wiki page is not very clear on this (I just added a short notice to clarify it), but the "nullable" attribute applies only to selection lists with type="enum".
Does woody currently have any facility to help us add a "null" or, say, a 'No Selection" choice to our field's selection list? If not, can anyone suggest a sensible approach?
Assuming you're using flowscript and a type="flow-jxpath" selection list, just add a suitable item to it after you've retrieved the values from the database:
items.add(0, new MyItemType());
HTH,
Ugo
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