我試圖從一個Django應用程序遷移到另一個基於這個問題的幾個模型How do I migrate a model out of one django app and into a new one?我已經得到了很多工作,但創建第一個遷移時,我得到這個錯誤:contenttypes.contenttype在此遷移中不可用
"The model 'contenttype' from the app 'contenttypes' is not available in this migration."
谷歌和SO似乎並沒有找到這種情況發生的任何情況下,與上述問題並沒有任何具體的說一下,要麼,除了在代碼中的註釋:
if not db.dry_run:
# For permissions to work properly after migrating
orm['contenttypes.contenttype'].objects.filter(app_label='common', model='cat').update(app_label='specific')
真的會升值嗎吃了什麼我做錯了什麼洞察力。
這裏有兩個遷移文件:
創建:
# encoding: utf-8
import datetime
from south.db import db
from south.v2 import SchemaMigration
from django.db import models
class Migration(SchemaMigration):
def forwards(self, orm):
db.rename_table('cars_country', 'general_country')
if not db.dry_run:
# For permissions to work properly after migrating
orm['contenttypes.ContentType'].objects.filter(app_label='cars', model='country').update(app_label='general')
def backwards(self, orm):
pass
刪除:
# encoding: utf-8
import datetime
from south.db import db
from south.v2 import SchemaMigration
from django.db import models
class Migration(SchemaMigration):
depends_on = (
('general', '0002_create_country'),
)
def forwards(self, orm):
db.alter_column('cars_club', 'country_id', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['general.Country'], null=True))
def backwards(self, orm):
db.rename_table('general_country', 'cars_country')
db.alter_column('cars_club', 'country_id', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['cars.Country'], null=True))
根據南文檔: _注意,您只能訪問已凍結的模型; South自動包括任何可以通過外鍵或多對多關係到達的內容,但是如果您想添加其他模型,只需將--freeze appname傳遞給./manage.py datamigration命令._ – dgel
因此,它的聲音就像您需要將ContentTypes應用程序在某個時間點傳遞給--freeze一樣。不完全瞭解如何,但可能是正確方向的暗示。 – dgel
假設ContentTypes應用程序不會成爲任何模式遷移的目標,那麼從Django項目中導入模型的難度有多大? _from django.contrib.contenttypes.models import ContentType_ _ContentType.objects.filter(app_label ='common',model ='cat')。update(app_label ='specific')_ – JCJS