Adding the code:
class EventHyperlink(serializers.HyperlinkedRelatedField):
view_name = 'content_endpoints:event-detail'
queryset = Event.objects.all()
def get_url(self, obj, view_name, request, format):
published_object = obj.get_published() # get the published version of the
object
if not published_object: # draft object was not published
primary_key = FAKE_PRIMARY_KEY
else:
primary_key = published_object.pk
url_kwargs = {
'pk': primary_key
}
return reverse(view_name, kwargs=url_kwargs, request=request, format=format)
def get_object(self, view_name, view_args, view_kwargs):
lookup_kwargs = {
'pk': view_kwargs['pk']
}
return self.get_queryset().get(**lookup_kwargs)
def to_representation(self, *args, **kwargs):
this = 'that'
class BaseSerializer(serializers.HyperlinkedModelSerializer):
layout = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:layout-detail',
many=False,
read_only=True
)
polymorphic_ctype = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:contenttype-detail',
many=False,
read_only=True)
slug = CleanedSlugField()
category = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:category-detail',
many=False,
read_only=True)
location = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:location-detail',
many=False,
read_only=True)
image = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:image-detail',
many=False,
read_only=True)
starts = serializers.SerializerMethodField()
ends = serializers.SerializerMethodField()
absolute_url = serializers.SerializerMethodField()
def get_starts(self, obj):
return obj.get_starts()
def get_ends(self, obj):
return obj.get_ends()
def get_absolute_url(self, obj):
cleaned_slug = obj.slug.rstrip('$')
protocol =
self.context['request']._request.META['SERVER_PROTOCOL'].split('/')
host = self.context['request']._request.META['HTTP_HOST']
path = app_reverse('event-detail', args=(cleaned_slug,))
return protocol[0] + '://' + host + path
class ExhibitionAndProgramContentSerializer(BaseSerializer):
hero_image = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:image-detail',
many=False,
read_only=True
)
hero_video = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:video-detail',
many=False,
read_only=True
)
events = EventHyperlink(
many=True,
required=False,
allow_null=True,
)
#events = serializers.HyperlinkedRelatedField(
# view_name='content_endpoints:event-detail',
# source='events.published',
# many=True,
# read_only=True,
# allow_null=True,
#)
programs = ProgramHyperlink(many=True)
#programs = serializers.HyperlinkedRelatedField(
# view_name='content_endpoints:program-detail',
# source='programs.published',
# many=True,
# read_only=True,
# allow_null = True,
#)
content_header = serializers.SerializerMethodField()
content_sponsor = serializers.SerializerMethodField()
content_event_main = serializers.SerializerMethodField()
def get_content_header(self, obj):
serializer = ContentSerializer(
instance=obj.contentitem_set.filter(placeholder__title='Header'),
many=True,
context=self.context,
)
return serializer.data
def get_content_sponsor(self, obj):
serializer = ContentSerializer(
instance=obj.contentitem_set.filter(placeholder__title='Sponsors'),
many=True,
context=self.context,
)
return serializer.data
def get_content_event_main(self, obj):
serializer = ContentSerializer(
instance=obj.contentitem_set.filter(placeholder__title='Event-Main'),
many=True,
context=self.context,
)
return serializer.data
class EventSerializer(BaseSerializer):
url = serializers.HyperlinkedIdentityField(
view_name='content_endpoints:event-detail',
)
exhibitions = ExhibitionHyperlink(
many=True,
)
#exhibitions = serializers.HyperlinkedRelatedField(
# view_name='content_endpoints:exhibition-detail',
# source='exhibitions.published',
# many=True,
# read_only=True,
# allow_null=True,
#)
programs = ProgramHyperlink(many=True)
#programs = serializers.HyperlinkedRelatedField(
# view_name='content_endpoints:program-detail',
# source='programs.published',
# many=True,
# read_only=True,
# allow_null=True,
#)
slide_show = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:slideshow-detail',
source='slide_show.published',
many=False,
read_only=True
)
content_info = serializers.SerializerMethodField()
content_sponsor = serializers.SerializerMethodField()
class Meta:
model = Event
fields = '__all__'
def get_content_info(self, obj):
serializer = ContentSerializer(
instance=obj.contentitem_set.filter(placeholder__title='Event
Information'),
many=True,
context=self.context,
)
return serializer.data
def get_content_sponsor(self, obj):
serializer = ContentSerializer(
instance=obj.contentitem_set.filter(placeholder__title='Sponsors'),
many=True,
context=self.context,
)
return serializer.data
class EventViewSet(viewsets.ReadOnlyModelViewSet):
queryset = Event.objects.all().order_by('created')
serializer_class = EventSerializer
pagination_class = PageNumberPagination
def get_queryset(self):
return self.queryset.published()
class ExhibitionSerializer(ExhibitionAndProgramContentSerializer):
url = serializers.HyperlinkedIdentityField(
view_name='content_endpoints:exhibition-detail',
)
department = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:department-detail',
many=True,
read_only=True
)
press_release = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:pressrelease-detail',
source='press_release.published',
many=False,
read_only=True
)
image_press_override = serializers.HyperlinkedRelatedField(
view_name='content_endpoints:image-detail',
many=False,
read_only=True
)
class Meta:
model = Exhibition
fields = '__all__'
class ExhibitionViewSet(viewsets.ReadOnlyModelViewSet):
queryset = Exhibition.objects.all().order_by('created')
serializer_class = ExhibitionSerializer
pagination_class = PageNumberPagination
def get_queryset(self):
return self.queryset.published()
class ProgramSerializer(ExhibitionAndProgramContentSerializer):
url = serializers.HyperlinkedIdentityField(
view_name='content_endpoints:program-detail',
)
exhibitions = ExhibitionHyperlink(many=True)
#exhibitions = serializers.HyperlinkedRelatedField(
# view_name='content_endpoints:exhibition-detail',
# source='exhibitions.published',
# many=True,
# read_only=True,
# allow_null=True,
#)
class Meta:
model = Program
fields = '__all__'
class ProgramViewSet(viewsets.ReadOnlyModelViewSet):
queryset = Program.objects.all().order_by('created')
serializer_class = ProgramSerializer
pagination_class = MicroPagination
def get_queryset(self):
published_qs = self.queryset.published()
return published_qs
`
On Tuesday, March 6, 2018 at 4:30:45 PM UTC-8, Amber Diehl wrote:
>
> Hi,
>
> I have not posted all the objects involved with this as that would make
> for a lot of code. If needed will provide.
>
> I am trying to serialize an object using a custom defined
> HyperlinkRelatedField. The subclass is required to get the correct object
> to link to--class contains two objects for each item, a "Draft" object, and
> the "Published" object.
>
> For example, the base model:
>
> PK Object Status Slug
> 1 EventSeries A Draft eventseries-a
> 14 EventSeries A Published eventseries-a
> 2 EventSeries B Draft eventseries-b
> 22 EventSeries B Published eventseries-b
>
> By default the "draft" event is returned, so this initial override is done
> in get_queryset method.
>
> However, for each Event Series there can be 0, n related Event objects
> which also have a draft and published version.
>
> These are related to the EventSeries model using a custom
> HyperlinkedRelatedField. This enables me to use the get_object method to
> return the published object instead of the draft.
>
> This works perfectly as long as there are associated Event objects. When
> there are none, I am getting the error Cannot resolve URL for hyperlinked
> relationship...
>
> I have tried adding allow_null=True, allow_blank=True to the custom
> HyperlinkedRelatedField but neither help.
>
> Alternatively, is there a way to override the to_representation method in
> relations.py/HyperlinkedRelatedField?
>
> Thanks in advance for your help.
>
>
>
>
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