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39 lines
1.0 KiB
Python
39 lines
1.0 KiB
Python
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from django.db import models
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from django.db.models.fields.related import ForeignObject
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class Address(models.Model):
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company = models.CharField(max_length=1)
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customer_id = models.IntegerField()
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class Meta:
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unique_together = [
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('company', 'customer_id'),
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]
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class Customer(models.Model):
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company = models.CharField(max_length=1)
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customer_id = models.IntegerField()
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address = ForeignObject(
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Address, models.CASCADE, null=True,
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# order mismatches the Contact ForeignObject.
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from_fields=['company', 'customer_id'],
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to_fields=['company', 'customer_id'],
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)
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class Meta:
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unique_together = [
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('company', 'customer_id'),
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]
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class Contact(models.Model):
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company_code = models.CharField(max_length=1)
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customer_code = models.IntegerField()
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customer = ForeignObject(
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Customer, models.CASCADE, related_name='contacts',
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to_fields=['customer_id', 'company'],
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from_fields=['customer_code', 'company_code'],
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)
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