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101 lines
3.1 KiB
101 lines
3.1 KiB
# -*- coding: utf-8 -*-
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#
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from collections import defaultdict
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from typing import Callable
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from django.db.models.signals import m2m_changed
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from rest_framework.response import Response
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from .action import RenderToJsonMixin
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from .filter import ExtraFilterFieldsMixin
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from .serializer import SerializerMixin
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__all__ = [
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'CommonApiMixin', 'PaginatedResponseMixin', 'RelationMixin',
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]
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class PaginatedResponseMixin:
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paginate_queryset: Callable
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get_serializer: Callable
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get_paginated_response: Callable
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def get_paginated_response_from_queryset(self, queryset):
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page = self.paginate_queryset(queryset)
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if page is not None:
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serializer = self.get_serializer(page, many=True)
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return self.get_paginated_response(serializer.data)
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serializer = self.get_serializer(queryset, many=True)
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return Response(serializer.data)
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class RelationMixin:
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m2m_field = None
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from_field = None
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to_field = None
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to_model = None
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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assert self.m2m_field is not None, '''
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`m2m_field` should not be `None`
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'''
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self.from_field = self.m2m_field.m2m_field_name()
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self.to_field = self.m2m_field.m2m_reverse_field_name()
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self.to_model = self.m2m_field.related_model
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self.through = getattr(self.m2m_field.model, self.m2m_field.attname).through
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def get_queryset(self):
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# 注意，此处拦截了 `get_queryset` 没有 `super`
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queryset = self.through.objects.all()
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return queryset
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def send_m2m_changed_signal(self, instances, action):
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if not isinstance(instances, list):
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instances = [instances]
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from_to_mapper = defaultdict(list)
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for i in instances:
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to_id = getattr(i, self.to_field).id
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# TODO 优化，不应该每次都查询数据库
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from_obj = getattr(i, self.from_field)
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from_to_mapper[from_obj].append(to_id)
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for from_obj, to_ids in from_to_mapper.items():
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m2m_changed.send(
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sender=self.through, instance=from_obj, action=action,
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reverse=False, model=self.to_model, pk_set=to_ids
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)
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def perform_create(self, serializer):
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instance = serializer.save()
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self.send_m2m_changed_signal(instance, 'post_add')
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def perform_destroy(self, instance):
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instance.delete()
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self.send_m2m_changed_signal(instance, 'post_remove')
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class QuerySetMixin:
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action: str
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get_serializer_class: Callable
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get_queryset: Callable
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def get_queryset(self):
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queryset = super().get_queryset()
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if hasattr(self, 'action') and (self.action == 'list' or self.action == 'metadata'):
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serializer_class = self.get_serializer_class()
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if serializer_class and hasattr(serializer_class, 'setup_eager_loading'):
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queryset = serializer_class.setup_eager_loading(queryset)
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return queryset
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class CommonApiMixin(SerializerMixin, ExtraFilterFieldsMixin,
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QuerySetMixin, RenderToJsonMixin,
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PaginatedResponseMixin):
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pass
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