29 lines
759 B
Python
29 lines
759 B
Python
"""
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Custom Django fields.
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"""
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from django.db import models
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class CharNullField(models.CharField):
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"""CharField that stores NULL but returns ''"""
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description = "CharField that stores NULL but returns ''"
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def to_python(self, value):
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"""Converts the value into the correct Python object."""
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if isinstance(value, models.CharField):
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return value
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if value is None:
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return ""
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else:
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return value
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def get_db_prep_value(self, value, connection, prepared=False):
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"""Converts value to a backend-specific value."""
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if not prepared:
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value = self.get_prep_value(value)
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if value == "":
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return None
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else:
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return value
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