django - 通过 ForeignKey->DateTimeField 过滤 Django-haystack

Question

我正在尝试按开始日期过滤我的搜索结果。然而，开始日期存储为 ForeignKey 对象的字段。

楷模

class Observation(models.Model):
    taxon_node = models.ForeignKey(TaxonNode)
    sample = models.ForeignKey(Sample)
    remarks = models.TextField(blank=True)

class Sample(models.Model):
    name = models.CharField(max_length=255)
    timespan_begin = models.DateTimeField()

搜索索引

class ObservationIndex(indexes.SearchIndex, indexes.Indexable):
    text = indexes.EdgeNgramField(document=True, use_template=True)
    taxon_node = indexes.CharField(model_attr='taxon_node')
    sample_timespan_begin = indexes.CharField(model_attr='sample__timespan_begin')

形式

class ObservationSearchForm(SearchForm):
    start_date = forms.DateTimeField(required=False)

    def search(self):
        sqs = super(ObservationSearchForm, self).search()

        if not self.is_valid():
            return self.no_query_found()

        if self.cleaned_data['start_date']:
            sqs = sqs.filter(sample_timespan_begin__gte=self.cleaned_data['start_date'])

        return sqs

指数

{{ object.taxon_node }}
{{ object.sample.timespan_begin }}
{{ object.remarks }}

我无法弄清楚问题出在哪里。应用过滤器后 sqs 不会改变。我的观察文本有问题还是 sqs.filter() 无效？

Answer 1

固定版本的 sqs =

sqs = SearchQuerySet().filter(sample_timespan_begin__gte=self.cleaned_data['start_date'])