Django - Queryset results not displaying in template-CodePudding

I am learning Django and building an inventory app for a laboratory. I already have data in all my models, and now I want to search the database based on some criteria and display the results in a table. First I ask the user to input the search terms (that part works), then I query the db (that also works) but when it's time to display results all I get is an empty template. No error messages.

These are my views:

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)

The query in search_results_primers returns this (from running it in the shell):

<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)...']>

and that is correct, it is the search result that I want, so far so good. But then it just returns an empty template, it does not display any data.

This is my template:

    <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>

I have tried iterating as explained here, I have reorganized result using dictionary = {i: d for i, d in enumerate(queryset)}, and whatever else I could find but it just won't work, I know the problem has to be in the result that I am passing to render, or in {% for item in result %}, but I am so stuck with this, I have spent hours on this and still no results. I need a pair of fresh eyes to take a look and tell me what is it I'm doing wrong.

CodePudding user response：

Since in the context, the queryset was passed in the keyword query, you need to use that same keyword in the template so:

{% for item in query %}
    ...

About this error:

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

This can happen in search_results_primers if filter_by is not 'primer_name', causing your view to return nothing. To fix it, make sure your view returns a response when filter_by is not primer_name.