How to GET data by search word Django - django

Question

I have problem getting the data to the home page.
I would like to filter out all the books based on Genre. I'm following the
MDN site for this.
index.html
{% extends "base_generic.html" %}
{% block content %}
<h1>Local Library Home</h1>
<p>Welcome to <em>Local Library</em>, a very basic Django website.</p>
<h2>Dynamic content</h2>
<form action="" method="get">
<input type="text" name="genre" placeholder="Search">
<input type="submit" value="Search">
</form>
{% endblock %}
urls.py
urlpatterns = [
url(r'^$', views.index, name='index'),
url(r'^books/$', views.BookListView.as_view(), name='books'),
url(r'^(?P<string>[-\w]+)$', views.GenreListView.as_view(), name='index'),
]
GenreListView class
class GenreListView(generic.ListView):
model = Book
def get(request, string):
try:
book = Book.objects.all().filter(genre=string)
except Book.DoesNotExist:
raise Http404("Book does not exist")
return render(
request,
'index.html',
context={'book': book,}
)
I can't figure out what I'm missing or what else I have to do to get all the date based on genre?
EDIT:
whole index.html
{% extends "base_generic.html" %}
{% block content %}
<h1> Book List </h1>
<form action="" method="get">
<input type="text" name="genre" placeholder="Search">
<input type="submit" value="Search">
</form>
{% if book_list %}
<ul>
{% for book in book_list %}
<li>
{{ book.title }} ({{ book.author }})
</li>
{% endfor %}
</ul>
{% else %}
<p>There are no books in the library</p>
{% endif %}
{% endblock %}

Answer 1

You should override get_queryset, No need to rewrite get
class GenreListView(generic.ListView):
model = Book
template_name = 'index.html'
def get_queryset(self):
books = Book.objects.all()
query = self.request.GET.get('genre', None)
if query:
return books.filter(genre=query)
return books
The exception Book.DoesNotExist will never
occur if you filter() queryset. it will always return a empty queryset in case of no object found