我有一个像这样的经理模型的GeoDjango项目;Python TastyPie - 自定义管理器方法作为过滤器?
class AdvertManager(models.GeoManager):
def within_box(self, x0, y0, x1, y1):
geometry = Polygon.from_bbox((x0, y0, x1, y1,))
return self.filter(point__within=geometry)
我试图让我的资源模型(AdvertResource)通过一个GET参数来暴露within_box函数,就像;
http://127.0.0.1:8000/api/v1/advert/?format=json&box=51.623349,-3.25362,51.514195,-3.4754133
我开始在资源模型上写这样一个build_filters
方法;
def build_filters(self, filters=None):
if not filters:
filters = {}
orm_filters = super(AdvertResource, self).build_filters(filters)
if 'box' in filters:
points = [float(p.strip()) for p in filters['box'].split(',')]
orm_filters = {'box': Advert.objects.within_box(*points).all()}
return orm_filters
但是,这会引发错误“无法解析关键字”框'入字段...“。
是否有可能将自定义管理器的方法暴露给api url?
编辑 - 我现在用下面的解决方案解决了这个问题。
class AdvertResource(ModelResource):
longitude = fields.FloatField(attribute='longitude', default=0.0)
latitude = fields.FloatField(attribute='latitude', default=0.0)
author = fields.ForeignKey(UserResource, 'author')
def build_filters(self, filters=None):
"""
Build additional filters
"""
if not filters:
filters = {}
orm_filters = super(AdvertResource, self).build_filters(filters)
if 'point__within_box' in filters:
points = filters['point__within_box']
points = [float(p.strip()) for p in points.split(',')]
orm_filters['within_box'] = points
return orm_filters
def apply_filters(self, request, applicable_filters):
"""
Apply the filters
"""
if 'within_box' in applicable_filters:
area = applicable_filters.pop('within_box')
poly = Polygon.from_bbox(area)
applicable_filters['point__within'] = poly
return super(AdvertResource, self).apply_filters(request,
applicable_filters)
现在,这意味着该请求http://127.0.0.1:8000/api/v1/advert/?format=json&point__within_box=51.623349,-3.25362,51.514195,-3.4754133
现在过滤边框范围内的结果。