Python Django-从Sqlite3迁移到Postgresql

我正试图在Heroku中部署我的Django应用程序，所以我必须切换到PostgreSQL，我一直在关注这些

但是，当我运行

python manage.py migrate

我得到以下错误：

C:\Users\admin\trailers>python manage.py migrate
Operations to perform:
  Apply all migrations: auth, movies, sessions, admin, contenttypes
Running migrations:
  Rendering model states... DONE
  Applying movies.0012_auto_20160915_1904...Traceback (most recent call last):
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\backends\
utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
psycopg2.ProgrammingError: foreign key constraint "movies_movie_genre_genre_id_d
9d93fd9_fk_movies_genre_id" cannot be implemented
DETAIL:  Key columns "genre_id" and "id" are of incompatible types: integer and
character varying.


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\managem
ent\__init__.py", line 350, in execute_from_command_line
    utility.execute()
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\managem
ent\__init__.py", line 342, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\managem
ent\base.py", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\managem
ent\base.py", line 399, in execute
    output = self.handle(*args, **options)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\managem
ent\commands\migrate.py", line 200, in handle
    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\migration
s\executor.py", line 92, in migrate
    self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_ini
tial)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\migration
s\executor.py", line 121, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_
initial)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\migration
s\executor.py", line 198, in apply_migration
    state = migration.apply(state, schema_editor)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\migration
s\migration.py", line 123, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, projec
t_state)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\migration
s\operations\fields.py", line 201, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\backends\
base\schema.py", line 482, in alter_field
    old_db_params, new_db_params, strict)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\backends\
base\schema.py", line 634, in _alter_field
    params,
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\backends\
base\schema.py", line 110, in execute
    cursor.execute(sql, params)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\backends\
utils.py", line 79, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\backends\
utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\utils.py"
, line 95, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\utils\six.py
", line 685, in reraise
    raise value.with_traceback(tb)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\db\backends\
utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: foreign key constraint "movies_movie_genre_gen
re_id_d9d93fd9_fk_movies_genre_id" cannot be implemented
DETAIL:  Key columns "genre_id" and "id" are of incompatible types: integer and
character varying.

我无法找出我的代码有什么问题，任何帮助都将不胜感激

---

编辑：我试图从流派类中删除id字段，但仍然出现相同的错误

您必须使用以下命令：

python manage.py makemigrations

在你命令之前

python manage.py migrate

---

“关键列”“流派id”“和”“id”“的类型不兼容：整数和字符变化。“流派id”定义为整数字段和电影。流派定义为接受字符变化的字段。多对多不能接受不同类型的外键。因此，您可以删除模型类类型中的id字段，这是不必要的，因为Django默认为您创建了id字段。但是，如果我想手动分配id，而不是让Django默认分配id，该怎么办？如果您想保留id字段，可以查看有关成员资格的信息，这可能会有所帮助。

python manage.py migrate