Django Queryset结果未显示在模板中

Question

我正在学习Django并为实验室构建一个清单应用程序。我的所有模型中都有数据，现在我想根据一些条件搜索数据库，并在表中显示结果。 首先，我要求用户输入搜索词（这一部分有效），然后我查询数据库（这也有效），但到了显示结果的时候，我得到的只是一个空模板。没有错误消息

以下是我的观点：

def choose_filter_primers(request):   # this works fine
    if request.method == "GET":
        radiobtn_form = PrimerRadiobtn(request.GET)
        
        if radiobtn_form.is_valid():
            # get value from user input and store it in request.session dict
            request.session['filter_by'] = radiobtn_form.cleaned_data['CHOOSE_FIELD']
            # go to the next step in the search form
            return render(request, 'lab_inventory/filter_primers.html')
    else:
        radiobtn_form = PrimerRadiobtn()
    
    return render(request, 'lab_inventory/choose_filter_primers.html', {'radiobtn_form': radiobtn_form})


def filter_primers(request):    # this works fine
    # get filter field from views.choose_filter_primers
    filter_by = request.session.get('filter_by')

    if request.method == "POST":
        form = FilterPrimerForm(request.POST)# or None)
        if form.is_valid():
            # get value from user input and store it in request.session dict
            request.session['contains'] = form.cleaned_data.get("contains")           
            # go to the next step in the search form
            return render(request, 'lab_inventory/search_results_primers.html')
        else:
            return render(request, 'lab_inventory/choose_filter_primers.html')
    else:
        form = FilterPrimerForm(request.POST)
        context = {'form': form}
        
    return render(request, 'lab_inventory/filter_primers.html', context)


def search_results_primers(request):   # MY PROBLEM IS HERE SOMEWHERE
    search_term = request.GET['contains'] # this variable refers to the value 'Ha'
    filter_by = request.session.get('filter_by') # this variable refers to the value 'primer_name'

    if filter_by == 'primer_name':
        query = Primer.objects.filter(primer_name__contains=search_term).values()
        result = {'query': query}
        
        return render(request, 'lab_inventory/search_results_primers.html', result)

search_results_primers中的查询返回以下内容（在shell中运行）：

<QuerySet [{'id': 303, 'primer_name': 'Ha-9-F', 'primer_seq': '5-TAGCTAACTTGGCCTGAAGCCTC-3', 'purchase_order': 201, 'date_received': datetime.date(2001, 1, 16), 'date_opened': datetime.date(2001, 1, 30), 'date_discarded': datetime.date(2001, 2, 27), 'stored_freezer': '-20/3', 'stored_box': 'H / 2'},
 {'id': 304, 'primer_name': 'Ha-9-R', 'primer_seq': '5-TCTCCCTCCGAAGCAGGTTTCGCGG-3', 'purchase_order': 201, 'date_received': datetime.date(2001, 1, 16), 'date_opened': datetime.date(2001, 1, 30), 'date_discarded': datetime.date(2001, 2, 27), 'stored_freezer': '-20/3', 'stored_box': 'H / 3'},
 {'id': 311, 'primer_name': 'Ha-10-F', 'primer_seq': '5-GTCCTGAATCATGTTTCCCCTGCAC-3', 'purchase_order': 205, 'date_received': datetime.date(2003, 12, 19), 'date_opened': datetime.date(2004, 1, 2), 'date_discarded': datetime.date(2004, 1, 30), 'stored_freezer': '-20/1', 'stored_box': 'F / 7'},]  '...(remaining elements truncated)...']>

这是正确的，这是我想要的搜索结果，，到目前为止还不错。但它只返回一个空模板，不显示任何数据

这是我的模板：

    <table id="search-results-primers-table">
      <tr>
        <th>Primer Name</th>
        <th>Primer Sequence</th>
        <th>Purchase Order</th>
        <th>Date Received</th>
        <th>Date Opened</th>
        <th>Date Discarded</th>
        <th>Freezer / Shelf</th>
        <th>Box / Position</th>
      </tr>
      <tbody>
        {% for item in result %}
          <tr>
            <td>{{ item.primer_name }}</td>
            <td>{{ item.primer_seq }}</td>
            <td>{{ item.purchase_order }}</td>
            <td>{{ item.date_received }}</td>
            <td>{{ item.date_opened }}</td>
            <td>{{ item.date_discarded }}</td>
            <td>{{ item.stored_freezer }}</td>
            <td>{{ item.stored_box }}</td>
          </tr>      
        {% endfor %}
      </body>
    </table>

我尝试过按解释进行迭代here，我用dictionary = {i: d for i, d in enumerate(queryset)}重新组织了result，还有我能找到的任何东西，但它就是不起作用，我知道问题必须在我要渲染的result中，或者在{% for item in result %}中，但我太执着于此，我花了几个小时在这上面，仍然没有结果。我需要一双新鲜的眼睛来看看，告诉我我做错了什么

Answer 1

因为在上下文中，queryset是在关键字query中传递的，所以您需要在模板中使用相同的关键字，以便：

{% for item in query %}
    ...

关于此错误：

didn't return an HttpResponse object. It returned None instead.

如果filter_by不是“primer_name”，则在search_results_primers中可能会发生这种情况，从而导致视图不返回任何内容。要修复它，请确保视图在filter_by不是primer_name时返回响应