У меня есть несколько приложений Django, все в одном каталоге проекта. В каждом приложении есть файл models.py с кучей моделей. Я без проблем импортировал модели из одного приложения в другое, в частности, для создания новой модели с полем внешнего ключа, указывающим на модель в другом приложении. Пока нет проблем.
Решил создать новую модель. Он имеет 4 поля ForeignKey, каждое из которых указывает на другую модель в другом приложении. Простой. Однако, когда я пытаюсь использовать south для переноса схемы в базу данных, он сообщает мне, что не может импортировать мои модели. Почему?!
Итак, это моя новая модель:
class Action_Tracker(models.Model):
dateOfAction = models.DateField(verbose_name = 'Date of Action')
user = models.CharField(max_length=30, verbose_name = 'Action completed by')
sys = models.ForeignKey(System, verbose_name='For System')
wo = models.ForeignKey(Work_Order, verbose_name='Associated WO', blank=True, null=True)
inv = models.ForeignKey(Invoice, verbose_name = 'Associated Invoice', blank=True, null=True)
subdT = models.ForeignKey(SUBD_Tracker, verbose_name = 'Associated SUBD Tracker', blank=True, null=True)
notes = models.TextField(verbose_name='Notes of Action', blank=True, null=True)
def __unicode__(self):
return u'%s -- %s' % (self.dateOfAction, self.notes)
class Meta:
orering = ['dateOfAction']
В верхней части этого файла models.py у меня есть следующий импорт:
from django.db import models
from django.forms import ModelForm, forms
from staff.models import Employee, Position
from work_orders.models import Work_Order, SUBD_Tracker
from invoices.models import Invoice
Насколько я могу судить, я импортирую их правильно. Однако, когда я пытаюсь выполнить миграцию схемы, я получаю следующую ошибку:
File "/srv/www/cpm/../cpm/systems/models.py", line 4, in <module>
from work_orders.models import Work_Order, SUBD_Tracker
File "/srv/www/cpm/work_orders/models.py", line 5, in <module>
from systems.models import System
File "/srv/www/cpm/systems/models.py", line 4, in <module>
from work_orders.models import Work_Order, SUBD_Tracker
ImportError: cannot import name Work_Order
Любая идея, что здесь происходит не так ??
Спасибо
ИЗМЕНИТЬ — по запросу
Я публикую код work_order models.py по запросу (по крайней мере, соответствующие части):
from django.db import models
from django.forms import ModelForm, forms
from django import forms
from products.models import Product
from systems.models import System
from labour.models import Labour_Costs
from staff.models import Employee
from datetime import date
import datetime
class Work_Order(models.Model):
IS_COMPLETE_CHOICES = (
('Y', 'Yes'),
('N', 'No'),
)
INVOICE_CREATED_CHOICES = (
('Y', 'Yes, mark WO complete and generate invoice (if applicable)'),
('N', 'No, just save these changes'),
)
WO_TYPE_CHOICES = (
('M', 'Mechanical'),
('I', 'Install'),
('S', 'Show'),
('R', 'Service'),
('B', 'Blow down'),
('U', 'Start up'),
)
woID = models.CharField(max_length = 25, primary_key = True, verbose_name = 'Work Order ID')
woType = models.CharField(max_length = 2, verbose_name = 'WO Type', default='R', choices = WO_TYPE_CHOICES)
systemID = models.ForeignKey(System, verbose_name = 'System ID')
notesToCrew = models.TextField(blank = True, null = True, verbose_name = 'Notes to Crew')
dateWOCreated = models.DateField(blank = True, null = True, default=datetime.date.today(), verbose_name = 'Date Created')
dateWORequired = models.DateField(blank = True, null = True, verbose_name = 'Date Required')
dateCompleted = models.DateField(blank = True, null = True, verbose_name = 'Date Completed')
numDays = models.DecimalField(max_digits = 3, decimal_places = 0, verbose_name = 'Number of Days to Complete', blank = True, null = True)
numHours = models.DecimalField(max_digits = 3, decimal_places = 2, verbose_name = 'Number of Hours to Complete', blank = True, null = True)
isComplete = models.CharField (max_length = 3, default = 'N', verbose_name = 'Set WO as Completed?', choices = IS_COMPLETE_CHOICES)
isScheduled = models.CharField (max_length = 3, default = 'N', verbose_name = 'Is WO scheduled?', choices = IS_COMPLETE_CHOICES)
isReqSoon = models.BooleanField(default=False, verbose_name='Is WO Required soon') #This flag will be set in a function to indicate that the WO is reqd within the current week/few days, whatever
problemDescription = models.TextField(verbose_name = 'Problem Description', blank = True, null = True)
resolution = models.TextField(verbose_name = 'Resolution', blank = True, null = True)
serviceFromBD = models.TextField(verbose_name = 'Service issues noticed', blank = True, null = True)
serviceFromBDEstTime = models.DecimalField(max_digits = 3, decimal_places = 2, verbose_name = 'Est. Time to Repair', blank = True, null = True)
numWorkers = models.DecimalField(max_digits = 3, default=1, decimal_places = 0, verbose_name = 'Number of Workers Required', blank = True, null = True)
invoiceCreated = models.CharField (max_length = 3, default = 'N', verbose_name = 'Generate Invoice?', choices = INVOICE_CREATED_CHOICES)
def __unicode__(self):
return u'%s - %s' % (self.woID, self.systemID.systemAddress)
class Meta:
ordering = ['woID']
class SUBD_Tracker(models.Model):
SUBD_CHOICES = (
('U', 'Startup'),
('B', 'Blowdown'),
)
sys = models.ForeignKey(System, verbose_name = 'Related System')
subd = models.CharField(max_length=1, verbose_name = 'SU or BD', choices = SUBD_CHOICES)
ssn = models.CharField(max_length=5, verbose_name = 'Season')
approved = models.BooleanField(verbose_name = 'Approved', default = False)
declined = models.BooleanField(verbose_name = 'Declined', default = False)
cancelled = models.BooleanField(verbose_name = 'Cancel', default = False)
firstNoticeSent = models.BooleanField(verbose_name = 'First Notice Sent?', default = False)
secondNoticeSent = models.BooleanField(verbose_name = 'Second Notice Sent?', default = False)
wo = models.ForeignKey(Work_Order, verbose_name = 'Related WO', blank = True, null = True)
def __unicode__(self):
if self.subd == 'U':
return u'%s: Startup - %s' % (self.sys, self.ssn)
else:
return u'%s: Blowdown - %s' % (self.sys, self.ssn)
class Meta:
ordering = ['sys']
