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djangomodels
alexvassel
alexvassel

Reputation: 10740

django models many-to-many relations issue

Django 1.3.

Suppose I have models:

class Inspector(models.Model):
    field = models.IntegerField()

Model_1(models.Model):
    inspectors = ManyToManyField(InspectorData)

And I have to create another model, where a field can store data only from Model_1().inspectors attribute. Smth like:

class Model_2(models.Model):
    model_1_inspectors = ManyToManyField(Model_1__inspectors)

How can I accomplish this in Django (if it is possible)?

Thanks in advance.

Upvotes: 0

Views: 56

Answers (2)

ndpu
ndpu

Reputation: 22561

First option is to override save method in Model_1 and on every save operation update inspectors in specially created model Model1inspectors. This way `Model_2' will look just like yours from question.

But i think it's better to customize queryset for that ManyToManyField in your form like this:

class Model_2Form(forms.ModelForm):
    class Meta:
        model = Model_2

    def __init__(self, *args, **kwargs):
        super(Model_2Form, self).__init__(*args, **kwargs)
        self.fields['model_1_inspectors'].queryset = InspectorData.objects.filter(
            pk__in=Model_1.objects.values('inspectors').distinct())

Upvotes: 1

Aswin Murugesh
Aswin Murugesh

Reputation: 11070

import the model required as

from myapp_folder.models import Inspector
class Model_2(models.Model):
    model_1_inspectors = ManyToManyField(Inspector)

This will work

Upvotes: 0

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