10

即使尚未插入搜索查询,我也想显示与所选方面匹配的所有结果。类似于一些商店应用程序的工作方式,例如亚马逊

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。

有什么想法可以绕过它吗?

谢谢!

4

5 回答 5

12

如果有人还在寻找,干草堆代码中建议了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()
于 2014-06-13T08:04:40.413 回答
6

为什么没有结果?

我想您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,此视图不会显示任何内容:

{% 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()方法实际上并不搜索任何内容,除非有查询。

获得结果

为了解决这个问题,我使用了自定义搜索表单。这是一个简短的示例:

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,视图代码有点骇人听闻。它不区分没有结果的无查询搜索和没有参数的搜索。

干杯!

于 2012-06-24T08:15:44.163 回答
3

查看SearchQuerySet

如果在 SearchIndex 中定义了颜色和价格,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)
于 2012-06-11T12:11:28.113 回答
1

如果不存在查询字符串,则以下表单显示所有结果。现在您可以添加自定义过滤器。

from your_app.forms import NonEmptySearchForm
url(r'^your_url$', 
SearchView(template='search.html',searchqueryset=sqs,form_class=NonEmptySearchForm), name='haystack_search'),

表格.py

#Overridding because the default sqs is always none if no query string is present
class NonEmptySearchForm(SearchForm):
    def search(self):
        if not self.is_valid():
            return self.no_query_found()
        sqs = self.searchqueryset.auto_query(self.cleaned_data['q'])
        if self.load_all:
            sqs = sqs.load_all()
        return sqs
于 2012-06-24T08:24:41.190 回答
0

Sumpy Joe Pete 的回答非常准确,但正如他所提到的,模板if query or page.object_list检查有点被黑了。解决这个问题的更好方法是创建你自己的SearchForm,如果它是空的,它仍然会找到一些东西q- 不会重新发布 - 并使用以下内容自定义SearchView

class MySearchView(SearchView):
    def get_query(self):
        query = []

        if self.form.is_valid():
            for field in self.form:
                if field.name in self.form.cleaned_data and self.form.cleaned_data[field.name]:
                    query.append(field.name+'='+str(self.form.cleaned_data[field.name]))

        return ' AND '.join(query)

在大多数情况下,您甚至不会使用该query值,因此您也可以快速检查是否设置了任何字段并返回True或类似的东西..或者当然您可以以任何方式修改输出想要(我什至不能 100% 确定我的解决方案适用于所有字段类型,但你明白了)。

于 2013-05-28T11:22:50.620 回答