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我今天晚上向模型添加了一个字段，当我运行makemigrations时，它告诉我该字段不存在。我注意到跟踪中引用了先前的迁移。我尝试添加另一个字段到不同的模型，并使迁移工作正常。Django runserver和makemigration失败，跟踪显示较旧的迁移
makemigrations不仅失败，而且runserver也失败。两者都与之前的迁移一起，追踪中的＃37。我试图产生＃40的移民。我手动创建了40号迁移，将我的字段放在models.py中，然后成功迁移。 Runserver然后工作得很好。
我想了解为什么之前的迁移导致该模型中的新makemigrations和runserver失败。我已经通过手动创建迁移脚本解决了这个问题，但是它让我担心以前的迁移会导致此问题。为什么新的makemigration尝试错误，因为我试图添加的确切字段不存在？
# Note: Model2 also happens to be my app name and I may have mistakenly put Model2 where I should have put app name. Since I'm struggling to read what is going on, I wasn't sure.
Unhandled exception in thread started by <function wrapper at 0x1077b3e60>
Traceback (most recent call last):
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/utils/autoreload.py", line 222, in wrapper
fn(*args, **kwargs)
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 107, in inner_run
self.check_migrations()
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 159, in check_migrations
executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/migrations/executor.py", line 17, in __init__
self.loader = MigrationLoader(self.connection)
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/migrations/loader.py", line 48, in __init__
self.build_graph()
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/migrations/loader.py", line 173, in build_graph
self.load_disk()
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/migrations/loader.py", line 103, in load_disk
migration_module = import_module("%s.%s" % (module_name, migration_name))
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/Users/my-user-name/Code/my-project-name/my-app/migrations/0037_auto_20150824_0114.py", line 8, in <module>
class Migration(migrations.Migration):
File "/Users/my-user-name/Code/my-project-name/my-app/migrations/0037_auto_20150824_0114.py", line 32, in Migration
field=models.ForeignKey(default=model1_model2_through.objects.all()[0].pk, to='model2.model1_model2_through'),
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/models/query.py", line 177, in __getitem__
return list(qs)[0]
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/models/query.py", line 141, in __iter__
self._fetch_all()
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/models/query.py", line 966, in _fetch_all
self._result_cache = list(self.iterator())
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/models/query.py", line 265, in iterator
for row in compiler.results_iter():
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 700, in results_iter
for rows in self.execute_sql(MULTI):
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 786, in execute_sql
cursor.execute(sql, params)
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/backends/utils.py", line 81, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/Users/my-user-name/.virtualenvs/my-project-name/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: column model2_model1_model2_through.test_boolean does not exist
LINE 1: ...nt_date", "model2_model1_model2_through"."deposit_date", "model2_model1...
class Model1(models.Model):
tours = models.ManyToManyField('Model2', through='Model1_Model2_Through')
...
class Model2(models.Model):
...
class Model1_Model2_Through(models.Model):
test_boolean = models.BooleanField(default=False)