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""" Serializer fields that deal with relationships with nested resources. These fields allow you to specify the style that should be used to represent model relationships with hyperlinks. """ from __future__ import unicode_literals from functools import reduce # import reduce from functools for compatibility with python 3 import rest_framework.relations # fix for basestring try: basestring except NameError: basestring = str class NestedHyperlinkedRelatedField(rest_framework.relations.HyperlinkedRelatedField): lookup_field = 'pk' parent_lookup_kwargs = { 'parent_pk': 'parent__pk' } def __init__(self, *args, **kwargs): self.parent_lookup_kwargs = kwargs.pop('parent_lookup_kwargs', self.parent_lookup_kwargs) super(NestedHyperlinkedRelatedField, self).__init__(*args, **kwargs) def get_url(self, obj, view_name, request, format): """ Given an object, return the URL that hyperlinks to the object. May raise a `NoReverseMatch` if the `view_name` and `lookup_field` attributes are not configured to correctly match the URL conf. """ # Unsaved objects will not yet have a valid URL. if hasattr(obj, 'pk') and obj.pk in (None, ''): return None # default lookup from rest_framework.relations.HyperlinkedRelatedField lookup_value = getattr(obj, self.lookup_field) kwargs = {self.lookup_url_kwarg: lookup_value} # multi-level lookup for parent_lookup_kwarg in list(self.parent_lookup_kwargs.keys()): underscored_lookup = self.parent_lookup_kwargs[parent_lookup_kwarg] # split each lookup by their __, e.g. "parent__pk" will be split into "parent" and "pk", or # "parent__super__pk" would be split into "parent", "super" and "pk" lookups = underscored_lookup.split('__') # use the Django ORM to lookup this value, e.g., obj.parent.pk lookup_value = reduce(getattr, [obj] + lookups) # store the lookup_name and value in kwargs, which is later passed to the reverse method kwargs.update({parent_lookup_kwarg: lookup_value}) return self.reverse(view_name, kwargs=kwargs, request=request, format=format) def get_object(self, view_name, view_args, view_kwargs): """ Return the object corresponding to a matched URL. Takes the matched URL conf arguments, and should return an object instance, or raise an `ObjectDoesNotExist` exception. """ # default lookup from rest_framework.relations.HyperlinkedRelatedField lookup_value = view_kwargs[self.lookup_url_kwarg] kwargs = {self.lookup_url_kwarg: lookup_value} # multi-level lookup for parent_lookup_kwarg in list(self.parent_lookup_kwargs.keys()): lookup_value = view_kwargs[parent_lookup_kwarg] kwargs.update({self.parent_lookup_kwargs[parent_lookup_kwarg]: lookup_value}) return self.get_queryset().get(**kwargs) def use_pk_only_optimization(self): return False class NestedHyperlinkedIdentityField(NestedHyperlinkedRelatedField): def __init__(self, view_name=None, **kwargs): assert view_name is not None, 'The `view_name` argument is required.' kwargs['read_only'] = True kwargs['source'] = '*' super(NestedHyperlinkedIdentityField, self).__init__(view_name=view_name, **kwargs)