Django Haystack - 显示结果而不需要搜索查询？

Question

即使未插入搜索查询,我也希望显示与所选方面匹配的所有结果.与某些商店应用程序的工作方式类似,例如Amazon

e.g. Show all products which are "blue" and between $10-$100.

如果未指定搜索查询,Haystack不会返回任何值.

我有什么想法可以解决它吗？

谢谢!

Answer 1

如果有人还在寻找,那么在haystack代码中建议使用一个简单的解决方案:

https://github.com/toastdriven/django-haystack/blob/master/haystack/forms.py#L34

class SearchForm(forms.Form):
    def no_query_found(self):
    """
    Determines the behavior when no query was found.

    By default, no results are returned (``EmptySearchQuerySet``).

    Should you want to show all results, override this method in your
    own ``SearchForm`` subclass and do ``return self.searchqueryset.all()``.
    """
    return EmptySearchQuerySet()

Answer 2

为什么没有结果？

我想你正在使用类似于大海捞针入门文档中的搜索模板.如果没有查询,则此视图不显示任何内容:

{% if query %}
    {# Display the results #}
{% else %}
    {# Show some example queries to run, maybe query syntax, something else? #}
{% endif %}

第二个问题是默认搜索表单的search()方法实际上不会搜索任何内容,除非有查询.

获得结果

为了解决这个问题,我正在使用自定义搜索表单.这是一个简短的样本:

class CustomSearchForm(SearchForm):
    ...
    def search(self):
        # First, store the SearchQuerySet received from other processing.
        sqs = super(CustomSearchForm, self).search()

        if not self.is_valid():
          return sqs

        filts = []

        # Check to see if a start_date was chosen.
        if self.cleaned_data['start_date']:
            filts.append(SQ(created_date__gte=self.cleaned_data['start_date']))

        # Check to see if an end_date was chosen.
        if self.cleaned_data['end_date']:
            filts.append(SQ(created_date__lte=self.cleaned_data['end_date']))

        # Etc., for any other things you add

        # If we started without a query, we'd have no search
        # results (which is fine, normally). However, if we
        # had no query but we DID have other parameters, then
        # we'd like to filter starting from everything rather
        # than nothing (i.e., q='' and tags='bear' should 
        # return everything with a tag 'bear'.)
        if len(filts) > 0 and not self.cleaned_data['q']:
            sqs = SearchQuerySet().order_by('-created_date')

        # Apply the filters
        for filt in filts:
            sqs = sqs.filter(filt)

        return sqs

另外,不要忘记更改视图:

{% if query or page.object_list %}
    {# Display the results #}
{% else %}
    {# Show some example queries to run, maybe query syntax, something else? #}
{% endif %}

实际上,视图代码有点hackish.它不区分无查询搜索,没有没有参数的搜索结果.

干杯!

Answer 3

看看SearchQuerySet。

如果您的 SearchIndex 中已经定义了颜色和价格，那么这应该是可能的：

sqs = SearchQuerySet().filter(color="blue", price__range=(10,100))

models(Model)您可以通过添加到 SearchQuerySet将查询限制为某些模型。因此，如果您想将查询限制为模型 Item 使用：

sqs = SearchQuerySet().filter(color="blue", price__range=(10,100)).models(Item)