blob: 2ce957cce7655af41b6550fc286a1e4845b536dc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
from django.db.backends import BaseDatabaseValidation
class DatabaseValidation(BaseDatabaseValidation):
def validate_field(self, errors, opts, f):
"""
MySQL has the following field length restriction:
No character (varchar) fields can have a length exceeding 255
characters if they have a unique index on them.
"""
from django.db import models
varchar_fields = (models.CharField, models.CommaSeparatedIntegerField,
models.SlugField)
if (isinstance(f, varchar_fields) and f.unique
and (f.max_length is None or int(f.max_length) > 255)):
msg = '"%(name)s": %(cls)s cannot have a "max_length" greater than 255 when using "unique=True".'
errors.add(opts, msg % {'name': f.name, 'cls': f.__class__.__name__})
|
