关于python：Django postgre迁移错误

Django postgre migrate error

我将数据库后端从sqlite3更改为postgre。当我尝试运行迁移时出现错误

1	MacBook-Pro-Oleg:avtofarm okorablev$ python3 manage.py migrate

执行的操作：
同步未迁移的应用程序：消息，avtofarm，smart_selects，静态文件，缩略图
应用所有迁移：contenttypes，admin，callboard，auth，sessions
无需迁移即可同步应用：
创建表格......
运行延迟的SQL ...
安装自定义SQL ...
正在运行迁移：
渲染模型状态...完成
应用callboard.0004_auto_20150701_1609 ... Traceback(最近一次调用最后一次)：
文件"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/utils.py"，第64行，执行
return self.cursor.execute(sql，params)
psycopg2.ProgrammingError：列"manufdate"无法自动转换为键入日期
提示：指定USING表达式以执行转换。

上述异常是以下异常的直接原因：

Traceback (most recent call last): File"manage.py", line 10, in

execute_from_command_line(sys.argv) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/init.py",
line 338, in execute_from_command_line
utility.execute() File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/init.py",
line 330, in execute
self.fetch_command(subcommand).run_from_argv(self.argv) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/base.py",
line 393, in run_from_argv
self.execute(*args, **cmd_options) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/base.py",
line 444, in execute
output = self.handle(*args, **options) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/commands/migrate.py",
line 221, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial) File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/executor.py",
line 110, in migrate
self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial) File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/executor.py",
line 148, in apply_migration
state = migration.apply(state, schema_editor) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/migration.py",
line 115, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state) File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/operations/fields.py",
line 201, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/base/schema.py",
line 484, in alter_field
old_db_params, new_db_params, strict) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/base/schema.py",
line 636, in _alter_field
params, File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/base/schema.py",
line 111, in execute
cursor.execute(sql, params) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/utils.py",
line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/utils.py",
line 64, in execute
return self.cursor.execute(sql, params) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/utils.py",
line 97, in exit
six.reraise(dj_exc_type, dj_exc_value, traceback) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/utils/six.py",
line 658, in reraise
raise value.with_traceback(tb) File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/utils.py",
line 64, in execute
return self.cursor.execute(sql, params) django.db.utils.ProgrammingError: column"manufdate" cannot be cast
automatically to type date HINT: Specify a USING expression to
perform the conversion.

模型

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

class Zip(models.Model):
category = models.ForeignKey(Category,null=True,verbose_name='Категория')
subcategory = ChainedForeignKey(SubCategory,chained_field="category",
chained_model_field="category",
show_all=False,
auto_choose=True,verbose_name='Подкатегория')
type = models.ForeignKey(Type,verbose_name='Состояние')
zipgroup = models.ForeignKey(ZipGroup,null=True,verbose_name='Группа запчастей')
ziptype = models.ForeignKey(ZipType,null=True,verbose_name='Вид запчасти')
cartype = models.ForeignKey(CarType,null=True,verbose_name='Тип авто')
carmodel = models.ForeignKey(CarModel,null=True,verbose_name='Модель транспорта')
carbodytype = models.ForeignKey(CarBodyType,null=True,verbose_name='Тип кузова')
catalognumber = models.CharField(max_length=100,null=True,blank=True,verbose_name='Номер по каталогу')
manufdate = models.CharField(max_length=4,null=True,verbose_name='Год выпуска')
title = models.CharField(max_length=100,verbose_name='Заголовок объявления')
description = models.TextField(null=True,verbose_name='Описание')
price = models.IntegerField(verbose_name='Цена')
user = models.ForeignKey(User,verbose_name='Пользователь')
creation_date = models.DateTimeField('date published')
is_sell = models.BooleanField(default=False)
is_active = models.BooleanField(default=True)
likes = models.IntegerField(default=0)