Looping in django template with variable parameter

Question

I want to get all the details of class Material where user=user_id Here is the models.py:

class Material(models.Model):
 subject = models.CharField(max_length=10)
 topic = models.CharField(max_length=50)
 user = models.IntegerField()

and my views.py:

def add_material(request):
 c = {}
 c.update(csrf(request))
 if 'user_session' in request.session:
 user_id = request.session['user_session']
 material_array = Material.objects.filter(user=user_id).values()
 materials_len = len(material_array)
 c['m_len'] = materials_len
 for i in range(0, materials_len):
 c['material_id_'+str(i)] = material_array[i]
 return render_to_response('add_material.html',c)
 else:
 return HttpResponseRedirect('/user')

and my add_material.html is:

{% for i in range(m_len) %}
 <tr>
 {% for j in material_id_+str(i) %}
 {{j.subject}}
 {{j.topic}}
 {% endfor %}
 </tr>
{%endfor%}

So I am getting error in template, how to insert variable in for loop?

• Wtower: What are you trying to do? Loop all users and all materials for each user?
• rnevius: You should add all of those items to a single materials list. That way, you won't need to do any of this.
• root: @Wtower actually i want to list of materials with details for a given user
• root: @mevius how can we do this?

Answer 1

This how I would do it.

views.py

def add_material(request):
 c = {}
 c.update(csrf(request))
 if 'user_session' in request.session:
 user_id = request.session['user_session']
 material_array = Material.objects.filter(user=user_id)
 c.update({'materials': material_array})
 return render_to_response('add_material.html', c)
 else:
 return HttpResponseRedirect('/user')

template

{% for material in materials %}
 <tr>
 <td>{{ material.subject }}</td>
 <td>{{ material.topic }}</td>
 <td>{{ material.user.username }}</td>
 </tr>
{% endfor %}

You can include any user field you like.