Yes. I realise that this is exactly the problem. Do you have some sort
of suggestion as to how one might do this?
My experience with this manager is calling it from the python shell.
I'm not exactly sure how I might do this.
Something like
if q
for term in terms:
q_objects.append(Q(name__icontains=term))
q_objects.append(Q
(description__icontains=term))
qs = self.get_query_set()
return qs.filter(reduce(operator.or_, q_objects))
else
do nothing?
I don't really know what to do :/
On 22 Apr, 10:55, Karen Tracey <kmtra...@gmail.com> wrote:
> On Wed, Apr 22, 2009 at 10:48 AM, tyrrrr <electioneer...@gmail.com> wrote:
>
> > this is the error:
>
> > reduce() of empty sequence with no initial value
>
> > Request Method: GET
> > Request URL: http://dsfffffffffffffffffffff/search/
> > Exception Type: TypeError
> > Exception Value: reduce() of empty sequence with no initial value
> > Exception Location: /dsfffffffffffffffffffff/models.py in search,
> > line 59
>
> > views.py in searching
> > 68. results = Entry.objects.search(query_string)
>
> > models.py in search
> > 59. return qs.filter(reduce(operator.or_, q_objects))
>
> The error implies your q_objects is an empty sequence:
>
> >>> import operator
> >>> reduce(operator.or_, ())
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: reduce() of empty sequence with no initial value
>
> Which, looking at your code, seems to be exactly what you'd expect for a url
> that has no q in request.GET. You can't call reduce on an empty sequence,
> so change your code to properly account for when it isn't given anything to
> search for.
>
> Karen
>
> > On 22 Apr, 09:17, tyrrrr <electioneer...@gmail.com> wrote:
> > > Hi
> > > I am trying to add a search view to an application I wrote in django
> > > but my EntryManager() seems to be getting hung up on the last line of
> > > code when django tries to call the url of the search.
>
> > > This EntryManager() (models.py) is excellent for performing searches
> > > in the django shell ($ python manage.py shell) like
>
> > > x = Entry.objects.search('spam')
> > > list(x)
>
> > > for example
>
> > > However when I attempt to visit the url of the search I am met with
> > > the error " reduce() of empty sequence with no initial value " and a
> > > reference to the last line of EntryManager()
>
> > > return qs.filter(reduce(operator.or_, q_objects))
> > > I use this method to strip multiple word queries and place underscores
> > > between the words
>
> > > type error:
> > > reduce() of empty sequence with no initial value
>
> > > The problems seems to be that the EntryManager() requires a string
> > > from the beginning and I haven't been able to make it work without
> > > one.
>
> > > The rest of my code works perfectly.
>
> > > Obviously the value will be empty before a query is made. What am I
> > > doing wrong? Is there perhaps a better way to connect my search view
> > > to this object?
>
> > > ps: I am aware that this isn't exactly a very efficient, scalable or
> > > long-term solution to my search issue. It is however important that I
> > > get this work as a temporary solution before I move to whoosh/
> > > haystack.
>
> > > Thanks everyone!
>
> > > //////////////////////
> > > models.py
>
> > > import operator
> > > from django.db import models
> > > from django.db.models import Q
>
> > > class EntryManager(models.Manager):
> > > def search(self, search_terms):
> > > terms = [term.strip() for term in search_terms.split
> > > ()]
> > > q_objects = []
> > > for term in terms:
> > > q_objects.append(Q(name__icontains=term))
> > > q_objects.append(Q
> > > (description__icontains=term))
> > > qs = self.get_query_set()
> > > return qs.filter(reduce(operator.or_, q_objects))
>
> > > //////////////////////
> > > views.py
>
> > > def searching(request):
> > > query_string = ''
> > > if ('q' in request.GET) and request.GET['q'].strip():
> > > query_string = request.GET['q'].strip()
> > > results = Entry.objects.search(query_string)
> > > return render_to_response("search_results.html",
> > > {'query_string': query_string, 'results' : results})
>
> > > //////////////////////
> > > search_results.html
>
> > > <div>Searched Results</div>
>
> > > {%if results%}
> > > {% for e in results%}
> > > <a href=../{{e.slug}}>{{e.name}}</a></div>
> > > {% endfor %}
> > > {% else %} Nothing to see here...
> > > {% endif %}
>
> > > //////////////////////
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