I just ran into this today, and thought someone else might be able to use
it.
I have need of an 'auto-increment' metadata column - When adding a new
document, if the field is blank, it should grab the next available number
and use that.
I implemented this using a Parser:
1. Edit apps/metadata/models.py and edit class MetadataType. Replace:
if self.parser:
> parser = import_string(self.parser)()
> value = parser.parse(value)
>
with:
> if self.parser:
> parser = import_string(self.parser)()
> parser.metadata_field = self #Rob - pass parent to parser
> value = parser.parse(value)
>
Now, the metadata instance is available within the parser class.
2. Edit apps/metadata/parsers.py and add metadata_field = None after the
class header:
> class MetadataParser(object):
> metadata_field = None
>
3. Add your parser code to the same file, after your other parsers:
class AutoIncrementID(MetadataParser):
> def execute(self, input_data):
> if input_data != '':
> return str(int(input_data))
>
> from .models import DocumentMetadata
> from django.db.models import Max
> return
> str(int(DocumentMetadata.objects.filter(metadata_type=self.metadata_field).aggregate(Max('value'))['value__max'])+1)
>
>
>
4. Register the new parser(bottom of the file, with the other similar
lines):
> MetadataParser.register(AutoIncrementID)
>
Now, you can create a metadata type, assign the new AutoIncrementID
parser(I suggest creating an Integer Validator for checking this too).
When you add/edit a Docunment with this metadata type, if you manually
enter a value it will accept it. If you leave the field blank, it will
force the next available number on it.
Hope this helps someone!
-Rob
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