My Django application is not displaying content from the db

Question

{% extends 'photos/base.html' %}
{% block galleries_active %}active{% endblock %}

{% block body%}
<div class="gallery-container" container-fluid>

    <!--- Galleries--->
    <div class="row">
        <div class="col-sm-12">
            <h3>Text's Gallery</h3>
        </div>
        {% if gallery %}
            {% for gallery in galleries %}
                <div class="col-sm-4 col-lg-2">
                    <div class="thumbnail">
                        <a href="{% url 'photos:details' gallery.id %}">
                            <img src="{{gallery.Gallery_logo}}" class="img-responsive" height="240" width="240">
                        </a>
                        <div class="caption">
                            <h2>{{gallery.Title}}</h2>
                            <h4>{{gallery.Category}}</h4>

                            <!-- View Details-->
                            <a href="{% url 'photos:detail' gallery.id %}" class="btn btn-primary btn-sm" role="button">View Details</a>

                            <!-- Delete Album-->
                            <form action="{% url 'photos:delete_gallery' gallery.id %}" method="post" style="display: inline;">
                                {% csrf_token %}
                                <input type="hidden" name="gallery_id" value="{{gallery.id}}">
                                <button type="submit" class="btn btn-default btn-sm">
                                    <span class="glyphicon glyphicon-trash"></span>
                                </button>
                            </form>

                            <!-- Favorite -->
                            <a href="#" class="btn btn-default btn-sm btn-favorite" role="button">
                                <span class="glyphicon glyphicon-star"></span>
                            </a>
                    </div>
                </div>
                </div>
                {% cycle '' '' '' '' '' '<div class="clearfix visible-lg"></div>' %}
            {% endfor %}
        {% else %}
            <div class="col-sm-12">
                <br>
                <a href="#">
                    <button type="button" class="btn btn-success">
                        <span class="glyphicon glyphicon-plus"></span>&nbsp; Add a Gallery
                    </button>
                </a>
            </div>
    {% endif %}

    </div>

</div>

</div>

{% endblock %}

That is my index file

below is my views.py file

from django.views import generic
from django.views.generic.edit import CreateView, UpdateView, DeleteView
from  django.core.urlresolvers import reverse_lazy
from .models import Gallery

class IndexView(generic.ListView):
    template_name = 'photos/index.html'
    context_object_name = 'all_galleries'

    def get_queryset(self):
        return Gallery.objects.all()

class DetailsView(generic.DetailView):
    model = Gallery
    template_name = 'photos/detail.html'

class GalleryCreate(CreateView):
    model = Gallery
    fields = ['Title','Category','Gallery_logo']

class GalleryUpdate(UpdateView):
    model = Gallery
    fields = ['Title','Category','Gallery_logo']

class GalleryDelete(DeleteView):
    model = Gallery
    success_url = reverse_lazy('photos:index')

and my models.py

from django.db import models
from django.core.urlresolvers import reverse


class Gallery(models.Model):
    Title = models.CharField(max_length=250)
    Category = models.CharField(max_length=250)
    Gallery_logo = models.CharField(max_length=1000)

    def get_absolute_url(self):
        return reverse('photos:detail', kwargs={'pk': self.pk})

    def __str__(self):
        return self.Title + '_' + self.Gallery_logo


class Picture (models.Model):
    Gallery = models.ForeignKey(Gallery, on_delete=models.CASCADE)
    Title = models.CharField(max_length=250)
    Artist = models.CharField(max_length=250)
    Price = models.CharField(max_length=20)
    interested = models.BooleanField(default=False)

    def __str__(self):
        return self.Title

I was following the newboston django tutorials video number 30 trying to make the same out put as bucky. If any one has followed the series and has a clean version of the video 30 index page source code please help out.

I modified the code to work for an online photogallery store where the admin will add images which are grouped in categories which can be downloaded by visitors.

Answer 1

You have context_object_name = 'all_galleries' in

class IndexView(generic.ListView):
    template_name = 'photos/index.html'
    context_object_name = 'all_galleries'
    ...

However you loop over galleries in template

{% for gallery in galleries %}

Needs to be

{% for gallery in all_galleries %}

Also you have {% if gallery %} before the loop in template which doesn't make sense, because there is no gallery variable. You need to check {% if all_galleries %}.

NOTE #1: your field names in classes that in models better be lowercase.

NOTE #2: in IndexView you need to provide model and you can remove get_queryset(), because there is no custom query that retrieve data with filters. So you need to use

class IndexView(generic.ListView):
    model = Gallery
    template_name = 'photos/index.html'
    context_object_name = 'all_galleries'