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POPython TastyPie - Custom manager methods as filters?
 

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  1. POPython TastyPie - Custom manager methods as filters?
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    <p>I have a GeoDjango project that has a manager model like this;</p> <pre><code>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) </code></pre> <p>I'm trying to get my resource model (AdvertResource) to expose the within_box function through a GET parameter, something like;</p> <pre><code>http://127.0.0.1:8000/api/v1/advert/?format=json&amp;box=51.623349,-3.25362,51.514195,-3.4754133 </code></pre> <p>I started to write a <code>build_filters</code> method on the resource model like this;</p> <pre><code>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 </code></pre> <p>But this throws an error "Cannot resolve keyword 'box' into field...".</p> <p>Is it possible to expose methods from a custom manager to the api urls?</p> <p><strong>EDIT - I have now solved this with the following solution.</strong></p> <pre><code>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) </code></pre> <p>This now means that the request <code>http://127.0.0.1:8000/api/v1/advert/?format=json&amp;point__within_box=51.623349,-3.25362,51.514195,-3.4754133</code> now filters all results within the bounding box.</p>
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