更改Django模型屬性，現在得到它的錯誤

Question

我有一個模型的DateField工作得很好。我想將它從DateField更改爲CharField。

前：

class NWEAScore(models.Model): 

    test_date = models.DateField(default=date.today, verbose_name='Test Date') 

後：

class NWEAScore(models.Model): 

    year = models.CharField(max_length=50, choices=YEAR_CHOICES, default=SIXTEEN) 
    season = models.CharField(max_length=50, choices=SESSION_CHOICES, default=FALL) 

不知道哪裏出了問題，但現在我得到一個錯誤。

進行移植不成問題。我製作它們，然後將它們上傳到我的服務器，然後在遷移時出現錯誤。 我得到當我嘗試運用我的遷徙中的錯誤：

(venv) alex@newton:~/newton$ python manage.py migrate 
Operations to perform: 
Apply all migrations: admin, amc, auth, brain, contenttypes, ixl, nwea, sessions 
Running migrations: 
Rendering model states... DONE 
Applying brain.0021_auto_20160927_0038... OK 
Applying nwea.0011_auto_20160927_0038...Traceback (most recent call last): 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/models/options.py", line 612, in get_field 
return self.fields_map[field_name] 
KeyError: 'test_date' 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
File "manage.py", line 10, in <module> 
execute_from_command_line(sys.argv) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line 
utility.execute() 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/core/management/__init__.py", line 359, in execute 
self.fetch_command(subcommand).run_from_argv(self.argv) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/core/management/base.py", line 305, in run_from_argv 
self.execute(*args, **cmd_options) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/core/management/base.py", line 356, in execute 
output = self.handle(*args, **options) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 202, in handle 
targets, plan, fake=fake, fake_initial=fake_initial 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 97, in migrate 
state = self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_initial) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 132, in _migrate_all_forwards 
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 237, in apply_migration 
state = migration.apply(state, schema_editor) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/migrations/migration.py", line 129, in apply 
operation.database_forwards(self.app_label, schema_editor, old_state, project_state) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/migrations/operations/models.py", line 525, in database_forwards 
getattr(new_model._meta, self.option_name, set()), 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 329, in alter_unique_together 
self._delete_composed_index(model, fields, {'unique': True}, self.sql_delete_unique) 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 352, in _delete_composed_index 
columns = [model._meta.get_field(field).column for field in fields] 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 352, in <listcomp> 
columns = [model._meta.get_field(field).column for field in fields] 
File "/home/alex/newton/venv/lib/python3.4/site-packages/django/db/models/options.py", line 614, in get_field 
raise FieldDoesNotExist('%s has no field named %r' % (self.object_name, field_name)) 
django.core.exceptions.FieldDoesNotExist: NWEAScore has no field named 'test_date' 

我經歷了，並刪除了我的所有實例從我的所有車型，只是櫃面剩餘「NWEAScore」實例與test_date被扔的錯誤。

我在整個項目中搜索了術語「test_date」，試圖刪除每個實例，而剩下的只有在舊遷移中的實例。我應該回去刪除那些嗎？那可以拋棄嗎？如果是這樣，我不清楚如何擦除遷移並創建新遷移。

我給了它一個鏡頭幾天，如果有人有提前感謝的建議！

Answer 1

轉至遷移您的應用程序的文件夾並刪除除__init__.py之外的所有文件。然後運行命令：

python manage.py makemigrations 

做出新的遷移與更新的領域