mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-11-14 05:36:50 +03:00
88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
from rest_framework import serializers
|
|
from rest_framework.templatetags.rest_framework import replace_query_param
|
|
|
|
# TODO: Support URLconf kwarg-style paging
|
|
|
|
|
|
class NextPageField(serializers.Field):
|
|
"""
|
|
Field that returns a link to the next page in paginated results.
|
|
"""
|
|
page_field = 'page'
|
|
|
|
def to_native(self, value):
|
|
if not value.has_next():
|
|
return None
|
|
page = value.next_page_number()
|
|
request = self.context.get('request')
|
|
url = request and request.build_absolute_uri() or ''
|
|
return replace_query_param(url, self.page_field, page)
|
|
|
|
|
|
class PreviousPageField(serializers.Field):
|
|
"""
|
|
Field that returns a link to the previous page in paginated results.
|
|
"""
|
|
page_field = 'page'
|
|
|
|
def to_native(self, value):
|
|
if not value.has_previous():
|
|
return None
|
|
page = value.previous_page_number()
|
|
request = self.context.get('request')
|
|
url = request and request.build_absolute_uri() or ''
|
|
return replace_query_param(url, self.page_field, page)
|
|
|
|
|
|
class PaginationSerializerOptions(serializers.SerializerOptions):
|
|
"""
|
|
An object that stores the options that may be provided to a
|
|
pagination serializer by using the inner `Meta` class.
|
|
|
|
Accessible on the instance as `serializer.opts`.
|
|
"""
|
|
def __init__(self, meta):
|
|
super(PaginationSerializerOptions, self).__init__(meta)
|
|
self.object_serializer_class = getattr(meta, 'object_serializer_class',
|
|
serializers.Field)
|
|
|
|
|
|
class BasePaginationSerializer(serializers.Serializer):
|
|
"""
|
|
A base class for pagination serializers to inherit from,
|
|
to make implementing custom serializers more easy.
|
|
"""
|
|
_options_class = PaginationSerializerOptions
|
|
results_field = 'results'
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
"""
|
|
Override init to add in the object serializer field on-the-fly.
|
|
"""
|
|
super(BasePaginationSerializer, self).__init__(*args, **kwargs)
|
|
results_field = self.results_field
|
|
object_serializer = self.opts.object_serializer_class
|
|
|
|
if 'context' in kwargs:
|
|
context_kwarg = {'context': kwargs['context']}
|
|
else:
|
|
context_kwarg = {}
|
|
|
|
self.fields[results_field] = object_serializer(source='object_list', **context_kwarg)
|
|
|
|
def to_native(self, obj):
|
|
"""
|
|
Prevent default behaviour of iterating over elements, and serializing
|
|
each in turn.
|
|
"""
|
|
return self.convert_object(obj)
|
|
|
|
|
|
class PaginationSerializer(BasePaginationSerializer):
|
|
"""
|
|
A default implementation of a pagination serializer.
|
|
"""
|
|
count = serializers.Field(source='paginator.count')
|
|
next = NextPageField(source='*')
|
|
previous = PreviousPageField(source='*')
|