convert string value to integer in Django template - django

Question

In home.html
<div class="container">
<div class="row">
<div class="col-md-6">
<h3>Select products:</h3>
<form id="selectProduct" role="search" method="get" action="{% url 'home' %}">
<select name="parameters" data-placeholder="Choose products" class="chosen-select" multiple tabindex="4">
{% for p in productnames %}
{% if k == p %}
<option value="{{ p.productnames }}" selected> {{ p.productnames }} </option>
{% else%}
<option value="{{ p.id }}"> {{ p.productnames }} </option>
{% endif %}
{% endfor %}
</select><br/>
<label for="submit"></label><button id="submit" type="submit" class="btn btn-default">Submit</button>
</form>
</div>
</div>
<div class="row"></div><br />
<h3> Distribution of sales in the products:</h3>
</div>
</div>
{% for p in productList %}
{% for pin in productnames %}
<p>{{pin.id}} {{p}}</p>
{% if p == pin.id %}
<p>exists</p>
{% else %}
<p>not exist</p>
{% endif %}
{% endfor %}
{% endfor %}
<p>{{ productList }}</p>
in this html file 'p' always returns a string value for ex: it returns like '10' instead of 10. all i want is to convent this '10' to 10 or convert returned other p_in value to 10 to '10'.
in views.py
def productList(request):
if request.method == 'GET':
p = request.GET.get('parameters')
print(p)
#k = request.GET('parameters[]')
productnames = Products.objects.all()
context = {
'productList': p, 'productnames': productnames,
}
return render(request, 'home.html', context)
I tried to convert the values of the p in product list to integer. because it dosen't mactch the format with pin.id

Answer 1

You filter the queryset in the template using if-else which is not ideal. Instead you should perform this filtering in the view itself. Also your parameters is a select tag which may have multiple selected values yet you use .get('parameters') which will only give you one value instead you should use the getlist method [Django docs] of the QueryDict:
def productList(request):
if request.method == 'GET': # Do you even need to check this? You appear to only use a GET request...
p = request.GET.getlist('parameters')
productnames = Products.objects.all()
filtered_products = Products.objects.filter(pk__in=p)
context = {
'productList': p, 'productnames': productnames, 'filtered_products': filtered_products
}
return render(request, 'home.html', context)
In the template your loop would simply become:
{% for product in filtered_products %}
{{ product.productnames }}
{% endfor %}
Note: You should use a form class instead of manually making a form. See Building a form in
Django.
Also a models name should be singular hence instead of
Products you should name it Product. In general in
your code you also break various naming conventions in Python, I would
suggest you to look at PEP 8 -- Style Guide for Python
Code

Answer 2

In views.py
def productList(request):
if request.method == 'GET':
p = request.GET.getlist('parameters')
print(p)
#k = request.GET('parameters[]')
productnames = Products.objects.all()
context = {
'productList': p, 'productnames': productnames,
}
# --- logic later for chart ------
return render(request, 'home.html', context)
In home.html
<div class="container">
<div class="row">
<div class="col-md-6">
<h3>Select products:</h3>
<form id="selectProduct" role="search" method="get" action="{% url 'home' %}">
<select name="parameters" data-placeholder="Choose products" class="chosen-select" multiple tabindex="4">
{% for p in productnames %}
{% if k == p %}
<option value="{{ p.productnames }}" selected> {{ p.productnames }} </option>
{% else%}
<option value="{{ p.id }}"> {{ p.productnames }} </option>
{% endif %}
{% endfor %}
</select><br/>
<label for="submit"></label><button id="submit" type="submit" class="btn btn-default">Submit</button>
</form>
</div>
</div>
<div class="row"></div><br />
<h3> Distribution of sales in the products:</h3>
</div>
</div>
{% for p in productList %}
{% for pin in productnames %}
<p>{{pin.id|stringformat:"s"}} {{p}}</p>
{% if p == pin.id|stringformat:"s" %}
<p>exists</p>
{% else %}
<p>not exist</p>
{% endif %}
{% endfor %}
{% endfor %}
<p>{{ productList }}</p>
Note {{value|stringformat:"s"}} can be used to convert integer value to string value