Python-сообщество

# app_places
from django.db import models
class Place(models.Model):
    movie = models.ManyToManyField('app_shows_and_times.Show', through='app_shows_and_times.Showtime')
    place_name = models.CharField(max_length=50, db_index=True)
    place_street = models.CharField('Street', max_length=80)
    place_phone = models.CharField('Phone', max_length=60)
    class Meta:
        db_table = 'place'

# app_shows_and_times
from django.db import models
        
class Show(models.Model):
    show_name = models.CharField(max_length=100, db_index=True)
    class Meta:
        db_table = 'show'
class Showtime(models.Model):
    showtime_dates = models.CharField('Date', max_length=30)
    showtime_times = models.CharField('Time', max_length=30)
    showtime_place = models.ForeignKey('app_places.Place', verbose_name='Place')
    showtime_show = models.ForeignKey(Show, verbose_name='Show name')
    class Meta:
        db_table = 'showtime'

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/antonio/projects/my_site/lib/python3.4/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/home/antonio/projects/my_site/lib/python3.4/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/antonio/projects/my_site/lib/python3.4/site-packages/django/core/management/base.py", line 393, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/antonio/projects/my_site/lib/python3.4/site-packages/django/core/management/base.py", line 444, in execute
    output = self.handle(*args, **options)
  File "/home/antonio/projects/my_site/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 146, in handle
    plan = executor.migration_plan(targets)
  File "/home/antonio/projects/my_site/lib/python3.4/site-packages/django/db/migrations/executor.py", line 59, in migration_plan
    for migration in self.loader.graph.forwards_plan(target):
  File "/home/antonio/projects/my_site/lib/python3.4/site-packages/django/db/migrations/graph.py", line 139, in forwards_plan
    self.ensure_not_cyclic(node, lambda x: (parent.key for parent in self.node_map[x].parents))
  File "/home/antonio/projects/my_site/lib/python3.4/site-packages/django/db/migrations/graph.py", line 196, in ensure_not_cyclic
    raise CircularDependencyError(", ".join("%s.%s" % n for n in cycle))
django.db.migrations.graph.CircularDependencyError: app_shows_and_times.0001_initial, app_places.0001_initial

movie = models.ManyToManyField('app_shows_and_times.Show', through='app_shows_and_times.Showtime')

movie = models.ManyToManyField('app_shows_and_times.Show', through='app_shows_and_times.Showtime')

showtime_show = models.ForeignKey(Show, verbose_name='Show name')

movie = models.ManyToManyField('app_shows_and_times.Show', through='app_shows_and_times.Showtime')

showtime_place = models.ForeignKey('app_places.Place', verbose_name='Place')

from django.db import models
class Person(models.Model):
    name = models.CharField(max_length=128)
    def __str__(self):              # __unicode__ on Python 2
        return self.name
class Group(models.Model):
    name = models.CharField(max_length=128)
    members = models.ManyToManyField(Person, through='Membership')
    def __str__(self):              # __unicode__ on Python 2
        return self.name
class Membership(models.Model):
    person = models.ForeignKey(Person)
    group = models.ForeignKey(Group)
    date_joined = models.DateField()
    invite_reason = models.CharField(max_length=64)

members = models.ManyToManyField(Person, through='Membership')

group = models.ForeignKey(Group)

SystemCheckError: System check identified some issues:
ERRORS:
app_shows_and_times.Showtime: (fields.E336) The model is used as an intermediate model by 'app_places.Place.movie', but it does not have a foreign key to 'Place' or 'Show'.

movie = models.ManyToManyField('app_shows_and_times.Show', through='app_shows_and_times.Showtime')

#settings
PROJECT_APPS = [
    'app_places',
    'app_shows_and_times',
]
#принты
Place
Show
Showtime

#settings
PROJECT_APPS = [
    'app_shows_and_times',
    'app_places',
]
#принты
Show
Showtime
Place

NameError: name 'Show' is not defined

movie = models.ManyToManyField('app_shows_and_times.Show', through='app_shows_and_times.Showtime')

movie = models.ManyToManyField('app_shows_and_times.Show', through='app_shows_and_times.Showtime')

movie = models.ManyToManyField('app_shows_and_times.Show')

ValueError: Cannot alter field app_places.Place.movie into app_places.Place.movie - they are not compatible types (you cannot alter to or from M2M fields, or add or remove through= on M2M fields)