Django syncdb exception after upgrading to 1.4

_{, , , , , Django Evolution ( syncdb) evolve --hint --execute. , - .,}

Python Django. , . , models.CharField(), .

included_domains = models.CharField(
     "set of comma(,) seprated list of domains in target emails", 
     default="",           
     max_length=it_len.EMAIL_LEN*5) 
excluded_domains = models.CharField(
    "set of comma(,) seprated list of domains NOT in target emails", 
    default="",               
    max_length=it_len.EMAIL_LEN*5) 

Django - 1.3.1:

$ python -c "import django; print django.get_version()"
1.3.1  <--------# version  

$python manage.py syncdb
Project signature has changed - an evolution is required

Django Evolution: Django Evolution - Django, .

$ python manage.py evolve --hint 
#----- Evolution for messagingframework
from django_evolution.mutations import AddField
from django.db import models


MUTATIONS = [
    AddField('MessageConfiguration', 'excluded_domains', models.CharField, initial=u'', max_length=300),
    AddField('MessageConfiguration', 'included_domains', models.CharField, initial=u'', max_length=300)
]
#----------------------
Trial evolution successful.
Run './manage.py evolve --hint --execute' to apply evolution.

, DB

$ python manage.py evolve --hint --execute
Traceback (most recent call last):
  File "manage.py", line 25, in <module>
    execute_manager(settings)
  File "/var/www/sites/www.taxspanner.com/django/core/management/__init__.py", line 362, in execute_manager
    utility.execute()
  File "/var/www/sites/www.taxspanner.com/django/core/management/__init__.py", line 303, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/var/www/sites/www.taxspanner.com/django/core/management/base.py", line 195, in run_from_argv  
    self.execute(*args, **options.__dict__)
  File "/var/www/sites/www.taxspanner.com/django/core/management/base.py", line 222, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/django_evolution-0.6.9.dev_r225-py2.7.egg/django_evolution/management/commands/evolve.py", line 60, in handle
    self.evolve(*app_labels, **options)
  File "/usr/local/lib/python2.7/dist-packages/django_evolution-0.6.9.dev_r225-py2.7.egg/django_evolution/management/commands/evolve.py", line 140, in evolve
    database))
  File "/usr/local/lib/python2.7/dist-packages/django_evolution-0.6.9.dev_r225-py2.7.egg/django_evolution/mutations.py", line 426, in mutate
    return self.add_column(app_label, proj_sig, database)
  File "/usr/local/lib/python2.7/dist-packages/django_evolution-0.6.9.dev_r225-py2.7.egg/django_evolution/mutations.py", line 438, in add_column
    sql_statements = evolver.add_column(model, field, self.initial)
  File "/usr/local/lib/python2.7/dist-packages/django_evolution-0.6.9.dev_r225-py2.7.egg/django_evolution/db/common.py", line 142, in add_column
    f.db_type(connection=self.connection),  # <===  here f is field class object
TypeError: db_type() got an unexpected keyword argument 'connection'

, , :

>>> def f(a):
...  print a
... 
>>> f('b', b='a')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: f() got an unexpected keyword argument 'b'
>>> 

, .

, , char, ( PostgreSQL), !

@: --4 .

, , - , .

Django 1.2 ; get_db_preb_lookup() get_db_prep_value() .

, "" , .

Django 1.2 PendingDeprecationWarning. Django 1.3 DeprecationWarning.

Django 1.4 - , , , , .

, - Django Evolution.

, ​​, connection. db_type() Django :

/django$ grep --exclude-dir=".svn" -n 'def db_type(' * -R 
contrib/localflavor/us/models.py:8:    def db_type(self):
contrib/localflavor/us/models.py:24:    def db_type(self):
   :
   :

Isoso Django

Field.db_type (self, connection):

, .

, models.filed def db_type(). PostgreSQL, 300 'char(300)'. models.py :

class CharMaxlengthN(models.Field):
    def db_type(self, connection):
        return 'char(%d)' % self.max_length  # because I am using postgresql  

^{, , , .}

( ) :

included_domains = CharMaxlengthN( # <--Notice change 
      "set of comma(,) seprated list of domains in target emails", 
      default="",           
      max_length=it_len.EMAIL_LEN*5) 
excluded_domains = CharMaxlengthN( # <-- Notice change
     "set of comma(,) seprated list of domains NOT in target emails", 
     default="",               
     max_length=it_len.EMAIL_LEN*5) 

, :

t$ python manage.py evolve --hint --execute

You have requested a database evolution. This will alter tables
and data currently in the None database, and may result in
IRREVERSABLE DATA LOSS. Evolutions should be *thoroughly* reviewed
prior to execution.

Are you sure you want to execute the evolutions?

Type 'yes' to continue, or 'no' to cancel: yes
Evolution successful.

. , .

ENUM, Specifying a mySQL ENUM in a Django model.

: models.Field , models.CharField.

DB-, :

class DecimalField(models.DecimalField):
    def db_type(self, connection):
        d = {
            'max_digits': self.max_digits,
            'decimal_places': self.decimal_places,
        } 
        return 'numeric(%(max_digits)s, %(decimal_places)s)' % d