Django, How to display 2 models on a Listview - django

Question

I am working with my first Django project
**model.py**
class product(models.Model):
product_code = models.CharField(max_length=15, unique=True)
product_name = models.CharField(max_length=100)
class stock_product(models.Model):
product_code = models.CharField(max_length=15)
branch_code = models.CharField(max_length=5)
quantity = models.IntegerField(default=0)
price = models.DecimalField(default=0)
**views.py**
class productList(ListView):
model = product
template_name = 'product/product_list.html'
def get_queryset(self):
queryset = super(productList, self).get_queryset()
self.filterset = productFilter(self.request.GET, queryset=queryset)
return self.filterset.qs
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
context['filter'] = self.filterset
return context
**product_list.html**
{% for alist in product_list %}
<tr>
<td>{{ alist.product_code }}</td>
<td>{{ alist.product_name }}</td>
<td>{{ alist.price }}</td>
<td>{{ alist.quantity }}</td>
</tr>
{% endfor %}
Sample Data in tables
**product**
['11111','paper'
'22222','Wood']
**stock_product**
['11111','BR1',150, 10
'11111','BR2',120, 10
'11111','BR3',100, 15
'22222','BR1',50, 200
'22222','BR2',70, 200
'22222','BR3',40, 250]
I want to get price and quantity from stock_product model, we can change branch_code by user
how can we do Plese help.
Thanks, But I want display only user branch (if user branch 'BR1' display only 'BR1')

Answer 1

**views.py**
class productList(ListView):
model = product
template_name = 'product/product_list.html'
def get_queryset(self):
queryset = super(productList, self).get_queryset()
self.filterset = productFilter(self.request.GET, queryset=queryset)
return self.filterset.qs
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
stock = stock_product.objects.all(). # this line added
context['filter'] = self.filterset
context['stock'] = stock # this line added
return context
Now having this you can access the stock from your template:
**product_list.html**
{% for alist in product_list %}
<tr>
<td>{{ alist.product_code }}</td>
<td>{{ alist.product_name }}</td>
<td>{{ alist.price }}</td>
<td>{{ alist.quantity }}</td>
</tr>
{% endfor %}
{% for s in stock %}
<tr>
<td>{{ s.product_code }}</td>
<td>{{ s.product_branch }}</td>
</tr>
{% endfor %}
BUT I have to just do not recommend you do this. Why? well, I suppose you want to make the match of the product_code. Except of that you should use ForeignKey on the models and so you will have a much simple code and logic:
Model:
class stock_product(models.Model):
product = models.ForeignKey(Product, on_delete=models.CASCADE) # this
branch_code = models.CharField(max_length=5)
quantity = models.IntegerField(default=0)
price = models.DecimalField(default=0)
And so now without modifying your view you could do this on the template to access the data:
template:
{% for alist in product_list %}
<tr>
<td>{{ alist.product_code }}</td>
<td>{{ alist.product_name }}</td>
<td>{{ alist.stock_product.branch_code }}</td>
<td>{{ alist.stock_product.quantity }}</td>
<td>{{ alist.stock_product.price }}</td>
</tr>
{% endfor %}

Answer 2

how about change the model with using foreign keys.
and use the django_tables2.
# **model.py**
from django.db import models
class product(models.Model):
product_code = models.CharField(max_length=15, unique=True)
product_name = models.CharField(max_length=100)
class stock_product(models.Model):
# product_code = models.CharField(max_length=15)
product = models.ForeignKey(product, on_delete=models.CASCADE)
branch_code = models.CharField(max_length=5)
quantity = models.IntegerField(default=0)
price = models.DecimalField(default=0)
this is table code for django_tables2.
class DetailedDataTable(tables.Table):
product_code = tables.Column(verbose_name='product_code', accessor='product_id')
product_name = tables.Column(verbose_name='product_name', accessor='product_id')
class Meta:
model = stock_product
template_name = "django_tables2/bootstrap.html"
fields = ('product_code', 'product_name', 'branch_code', 'quantity', 'price')
def render_product_code(self,value, record):
return product.objects.get(id=value).product_code
def render_product_name(self,value, record):
return product.objects.get(id=value).product_name
and this is view
def view(request):
template_name = 'template.html'
query_set = stock_product.objects.all()
table = DetailedDataTable(qs)
context={
'table':table,
}
return render(request, template_name, context)
and this is for template page uses.
{# tutorial/templates/tutorial/people.html #}
{% load render_table from django_tables2 %}
<!doctype html>
<html>
<head>
<title>List</title>
</head>
<body>
{% render_table table %}
</body>
</html>
:)