18 lines
830 B
Python
18 lines
830 B
Python
from django.db.backends import BaseDatabaseValidation
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class DatabaseValidation(BaseDatabaseValidation):
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def validate_field(self, errors, opts, f):
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"""
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MySQL has the following field length restriction:
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No character (varchar) fields can have a length exceeding 255
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characters if they have a unique index on them.
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"""
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from django.db import models
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varchar_fields = (models.CharField, models.CommaSeparatedIntegerField,
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models.SlugField)
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if (isinstance(f, varchar_fields) and f.unique
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and (f.max_length is None or int(f.max_length) > 255)):
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msg = '"%(name)s": %(cls)s cannot have a "max_length" greater than 255 when using "unique=True".'
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errors.add(opts, msg % {'name': f.name, 'cls': f.__class__.__name__})
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