Python - Filtering in Many to Many Relationship in Django - Stack Overflow
Transcript of Python - Filtering in Many to Many Relationship in Django - Stack Overflow
26/03/14 python - Filtering in Many to Many relationship in django - Stack Overflow
stackoverflow.com/questions/13855033/filtering-in-many-to-many-relationship-in-django 1/2
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Vino77 1 8
1 Answer
I have two classes Location and Supplier. A supplier supplies its products to one or more cities.
class Location(models.Model): cities = models.CharField(max_length=30)
class Supplier(models.Model): name = models.CharField(max_length=100) supplied_cities = models.ManyToManyField(Location)
Now I have to get all the Suppliers for a city, from a list of Cities. for example: If London is clicked, Ishould get the all the suppliers related to London. How should I do this?
Supplier.objects.filter(supplied_cities= 1)
Above shell command lists all suppliers from city 1 (int). But I have to capture the City Name from theweb page and filter based on it?
View:
def my_view(request): cityName = request.GET['place'] sellers = Supplier.objects.filter(supplied_cities= Location.objects.get(cities=cityName)) context = {'sellers' : sellers } return render_to_response('results.html',context,context_instance=RequestContext(request))
Template:
{% for sellers in object_list %}<li> {{ sellers.name }} </li>{% endfor %}
python django
edited Dec 13 '12 at 10:47 asked Dec 13 '12 at 7:29
You want to use lookups that span relationships:
def my_view(request): city_name = request.GET.get('place') sellers = Supplier.objects.filter(supplied_cities__cities=city_name) context = {'sellers' : sellers } return render_to_response('results.html', context, context_instance=RequestContext(request))
And then your template:
{% for seller in sellers %} <li> {{ seller.name }} </li>{% endfor %}
You misnamed your context variable.
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Filtering in Many to Many relationship in django
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26/03/14 python - Filtering in Many to Many relationship in django - Stack Overflow
stackoverflow.com/questions/13855033/filtering-in-many-to-many-relationship-in-django 2/2
Josh Smeaton17k 11 55 105
You misnamed your context variable.
I also highly recommend either using django forms or the url dispatcher for passing arguments to yourviews.
url(r'̂/sellers/(?P<city>\w+)/$', my_view, name='sellers')
def my_view(request, city): # rest of your view
edited Dec 13 '12 at 11:05 answered Dec 13 '12 at 10:57
Thanks. Filter works in shell command. How should I create the URL? For example, currently I am using127.0.0.1:8000/locations/search/london but it looks like context variable 'sellers' is always empty. – VinoDec 14 '12 at 6:45
Thanks. It worked. – Vino Dec 21 '12 at 8:44
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