CODEWITHSUNDEEP
pythondjangodjango-modelsdjango-orm
akrisanov
akrisanov

Reputation: 3214

Django ORM Query: getting "has many" relation objects

There is a model:

class DomainPosition(models.Model):
    domain   = models.ForeignKey(Domain)
    keyword  = models.ForeignKey(Keyword)
    date     = models.DateField()
    position = models.IntegerField()

    class Meta:
        ordering = ['domain', 'keyword']

How to get the positions records for a template if for each domain I want to display a next table (figures in the table are position values):

+----------+--------+--------+-------+--------
| keyword  | date1  | date2  | date3 | ...
+----------+--------+--------+-------+--------
| keyword1 |    2   |    6   |    7  |   ...
+----------+--------+--------+-------+--------
| keyword2 |    4   |   12   |    5  |   ...
+----------+--------+--------+-------+--------
| keyword3 |    6   |    3   |    9  |   ...
+----------+--------+--------+-------+--------

where views.py:

def show_domain_history(request, domain_name):
    domain = Domain.objects.filter(name__contains=domain_name)
    if not domain:
        return HttpResponseRedirect('/')
    else:
        # positions = ...
        variables = RequestContext(request, {
            'domain':    domain[0].name,
            'positions': positions,
        })
        return render_to_response('history.html', variables)

Upvotes: 1

Views: 451

Answers (2)

Ankit Jaiswal
Ankit Jaiswal

Reputation: 23427

def show_domain_history(request, domain_name):
    domain = Domain.objects.filter(name__contains=domain_name)
    if not domain:
        return HttpResponseRedirect('/')
    else:
        variables = {'domain': domain }
        return render_to_response('history.html', variables)

now in the template you can iterate through this as:

{% for dom in domain %}

name: {{ dom.name }}

{% for item in dom.domainposition_set %} 

     date: item.date

     position: item.position
{% endfor %}

{% endfor %}

Upvotes: 1

Johannes Charra
Johannes Charra

Reputation: 29913

Since you have a foreign key from DomainPosition to Domain, you should be able to get the set of all domain positions that reference a particular domain dom with dom.domainposition_set.all().

You can then build your table by iterating over this list of domain positions in your template.

Upvotes: 0

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