Hi,
I have two different apps that contain classes of the same name, and using
a related name in a GenericRelation doesn't seem to be helping. Here are
the details:
In both of the apps I have "Source" and "Variable." They're not the same
for either app, so I can't just create one. These apps are called "hs_core"
and "ref_ts." In both apps I have a class called
"<app_name(CamelCase)>Metadata" that has a GenericRelation to both of the
Source and Variable classes. So I added a related_name in order to
differentiate between the two in the database. It didn't seem to have any
effect at all. Here are some snippets of the code (I can add more if you
need):
In ref_ts:
class Source(AbstractMetaDataElement):
term = 'Source'
derived_from = models.CharField(max_length=300)
organization = models.CharField(max_length=200, null=True)
source_description = models.CharField(max_length=400, null=True)
def __unicode__(self):
return self.derived_from
@classmethod
def create(cls, **kwargs):
if 'derived_from' in kwargs:
# check the source doesn't already exists - source needs to be
unique per resource
if 'metadata_obj' in kwargs:
metadata_obj = kwargs['metadata_obj']
metadata_type =
ContentType.objects.get_for_model(metadata_obj)
src = Source.objects.filter(derived_from=
kwargs['derived_from'], object_id=metadata_obj.id,
content_type=metadata_type).first()
if src:
raise ValidationError('Source:%s already exists for
this resource.' % kwargs['derived_from'])
src =
Source.objects.create(derived_from=kwargs['derived_from'],
organization=kwargs.get('organization'),source_description=kwargs.get('source_description'),
content_object=metadata_obj)
return src
else:
raise ValidationError('Metadata instance for which source
element to be created is missing.')
else:
raise ValidationError("Source data is missing.")
@classmethod
def update(cls, element_id, **kwargs):
src = Source.objects.get(id=element_id)
if src:
if 'derived_from' in kwargs:
src.derived_from = kwargs['derived_from']
if 'organization' in kwargs:
src.organization = kwargs['organization']
if 'source_description' in kwargs:
src.source_description = kwargs['source_description']
src.save()
else:
raise ObjectDoesNotExist("No source element was found for the
provided id:%s" % element_id)
@classmethod
def remove(cls, element_id):
src = Source.objects.get(id=element_id)
if src:
src.delete()
else:
raise ObjectDoesNotExist("No source element was found for
id:%d." % element_id)
class RefTSMetadata(CoreMetaData):
...
variables = generic.GenericRelation(Ref_TS_Variable,
related_name='ref_ts_variables')
sources = generic.GenericRelation(Ref_TS_Source,
related_name='ref_ts_sources')
...
@classmethod
def get_supported_element_names(cls):
# get the names of all core metadata elements
elements = super(RefTSMetadata, cls).get_supported_element_names()
# add the name of any additional element to the list
elements.append('Method')
elements.append('QualityControlLevel')
elements.append('Variable')
elements.append('Site')
return elements
@property
def resource(self):
return self._refts_resource.all().first()
def get_xml(self):
...
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