manage.py migrate 未在生产中激活...列 X 不存在...为什么？

Question

我收到此错误；

ProgrammingError at /
column main_category.parent_cat_id does not exist
LINE 1: ...n_category"."author_id", "main_category"."image", "main_cate. and I believe this means parent_cat_id isn't in the database. 

这是我不明白的，我将它设置为null=true 和blank=true....这在本地开发服务器中工作。该错误仅在生产中发生。（我使用的是弹性豆茎）

class Category(models.Model): 
    name = models.CharField(max_length=128, unique=True)
    author = models.ForeignKey(settings.AUTH_USER_MODEL)

    parent_cat = models.ForeignKey('self', null=True, blank=True)
    hotCat = models.BooleanField(default=False)
    active = models.BooleanField(default=True)

    sponsored = models.ForeignKey(Sponsored, null=True, blank=True)


    objects = CategoryManager()

    def __unicode__(self): 
        return self.name

    def get_absolute_url(self):
        return "/category/%s/" %self.name

    def get_image_url(self):
        return "%s%s" %(settings.MEDIA_URL, self.image)

编辑：

这是我的 python 配置文件，你可以看到我已经迁移了

container_commands:
  01_migrate:
    command: "source /opt/python/run/venv/bin/activate && python myproject/manage.py migrate --noinput"
    leader_only: true

  02_uninstall_pil:
    command: "source /opt/python/run/venv/bin/activate && yes | pip uninstall Pillow"

  03_reinstall_pil:
    command: "source /opt/python/run/venv/bin/activate && yes | pip install Pillow --no-cache-dir"

  04_createsu:
    command: "source /opt/python/run/venv/bin/activate && python myproject/manage.py createsu"
    leader_only: true

  05_collectstatic:
    command: "source /opt/python/run/venv/bin/activate && python myproject/manage.py collectstatic --noinput"

  06_checkpermission:
    command: "source /opt/python/run/venv/bin/activate && python myproject/manage.py check_permissions"


option_settings:
  "aws:elasticbeanstalk:application:environment":
    DJANGO_SETTINGS_MODULE: "myproject.settings"
    "PYTHONPATH": "/opt/python/current/app/myproject:$PYTHONPATH"
  "aws:elasticbeanstalk:container:python":
    WSGIPath: myproject/myproject/wsgi.py

我的回溯

Traceback:
File "/opt/python/run/venv/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/opt/python/current/app/myproject/main/views.py" in index
  64.       request.session['categories'] = [ c.name for c in Category.objects.filter(author=request.user.id)] # add to the session 
File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/models/query.py" in __iter__
  162.         self._fetch_all()
File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/models/query.py" in _fetch_all
  965.             self._result_cache = list(self.iterator())
File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/models/query.py" in iterator
  238.         results = compiler.execute_sql()
File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in execute_sql
  840.             cursor.execute(sql, params)
File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  79.             return super(CursorDebugWrapper, self).execute(sql, params)
File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  64.                 return self.cursor.execute(sql, params)
File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/utils.py" in __exit__
  97.                 six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  64.                 return self.cursor.execute(sql, params)

Exception Type: ProgrammingError at /
Exception Value: column main_category.parent_cat_id does not exist
LINE 1: ...n_category"."author_id", "main_category"."image", "main_cate...
                                                             ^

我的迁移文件

operations = [
    migrations.CreateModel(
        name='Category',
        fields=[
            ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
            ('name', models.CharField(unique=True, max_length=128)),
            ('description', models.TextField(verbose_name=b'\xec\xbb\xa4\xeb\xae\xa4\xeb\x8b\x88\xed\x8b\xb0 \xec\x84\xa4\xeb\xaa\x85')),
            ('image', models.ImageField(upload_to=b'images/', null=True, verbose_name=b'\xec\xbb\xa4\xeb\xae\xa4\xeb\x8b\x88\xed\x8b\xb0 \xeb\x8c\x80\xed\x91\x9c \xec\x9d\xb4\xeb\xaf\xb8\xec\xa7\x80', blank=True)),
            ('hotCat', models.BooleanField(default=False)),
            ('active', models.BooleanField(default=True)),
            ('author', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
            ('parent_cat', models.ForeignKey(blank=True, to='main.Category', null=True)),
        ],
    ),

Answer 1

发生这种情况是因为在运行迁移脚本之前评估了一些使用此新字段的代码，具体如下：

File "/opt/python/current/app/myproject/main/views.py" in index
  64.       request.session['categories'] = [ c.name for c in Category.objects.filter(author=request.user.id)] # add to the session

解决方案是重写该代码使其不被评估，或者临时将其注释掉以便进行迁移。

这在本地没有发生，因为您可能在模型中定义了一个新字段，运行迁移脚本，然后编写了该视图代码。