On Monday, 23 October 2017 16:59:36 UTC+1, Jack wrote:
>
> This is a semi-long question. Please let me know wherever I make a
> mistake.
>
> I'm building a search form with 4 required choices, 1 of the choices is a
> CharField with a max_length of 3. The other 3 choices are ChoiceField's.
> Here is a picture of what the search form looks like:
>
>
> <https://lh3.googleusercontent.com/-8GREjIuYfMc/We4LXpdGMtI/AAAAAAAACeI/lF08A9M1zj4gL3saaVvKY9rWZ4APYU4EACLcBGAs/s1600/Capture.PNG>
>
> I've read through the Django docs and other things on the Internet but I'm
> still very unclear about how to approach this.
>
> 1. First I believe I need to create 4 args or kwargs in the url for each
> of the choices. If I use args, it would look something like...
>
> url(r'^search?(\w+{3})&(\w+{2})&(\w+{1-2})&(\w+{1-2})', function/class
> view, name='search')
>
> 2. Next, I need to pass the user's input in the html page into the url
> args. I have a form set up to get the user's input. But how would I write
> this on the HTML page? Do I simply make a url tag like {% url 'search'
> args1, args2, args3, args4 %}?
>
> 3. Then I need to create the views function. My first question is, should
> I use a function-based view or the generic class-based ListView? The
> result of the search will be a list of items, so ListView is a good
> template to use, but I don't know how having 4 args would affect using
> ListView. My second question is, what is the most effective way of making
> this search? I need to check if any records in the database matches the
> user's search, so would I do something like 'For record in database' to
> check over every record in the database?
>
> If I used a function view, would it look something like:
>
> def search(request, args1, args2, args3, args4):
> for record in database:
> if args matches record:
> display record
>
> Thank you for reading through the question
>
Your difficulties all stem from the same misunderstanding here.
Forms - at least when using the GET action - put their arguments in the
querystring - the bit after the ? in the URL. Django doesn't treat that as
part of the URL itself, but as a separate attribute, `request.GET`. So both
your first and second questions are irrelevant: you don't need to capture
the values in a URL pattern, and nor do you need to insert them in there in
the HTML somehow. Just use a basic pattern of `r('^search/$)` and all will
be fine.
For your third question, it makes no difference whether you use function or
class-based views. If you did use a ListView, though, you could override
`get_queryset` to filter by the values in the GET dictionary:
def get_queryset(self):
qs = super(MyListView, self).get_queryset()
if 'bedrooms' in request.GET:
qs = qs.filter(bedrooms=request.GET['bedrooms']
... etc ...
return qs
--
DR.
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