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copied!<p>You could have the relationship on the <code>FinancialTransaction</code> using a Generic foreign key.</p> <p><a href="https://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#id1" rel="nofollow">https://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#id1</a></p> <pre><code>from django.db import models from django.contrib.contenttypes.models import ContentType from django.contrib.contenttypes import generic class FinatialTransation(models.Model): content_type = models.ForeignKey(ContentType) object_id = models.PositiveIntegerField() content_object = generic.GenericForeignKey('content_type', 'object_id') </code></pre> <p>Then the relationship exists in one place and there can only be 1.</p> <p>Then from the <code>FinancialTransaction</code> you check the object ID and the objects <code>ContentType</code> and look it up accordingly.</p> <pre><code>ft = FinancialTransaction.objects.get(...) thing = ft.content_type.get_object_for_this_type(id=ft.object_id) </code></pre> <p>Additionally you can then limit the GenericForeignKey to certain content types with:</p> <pre><code>class FinatialTransation(models.Model): limit = models.Q( models.Q(app_label='yourappsname', model='ThingOne') | models.Q(app_label='yourappsname', model='ThingTwo') | models.Q(app_label='yourappsname', model='ThingThree') ) content_type = models.ForeignKey(ContentType, limit_choices_to=limit) object_id = models.PositiveIntegerField() content_object = generic.GenericForeignKey('content_type', 'object_id') </code></pre>

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