Databases
StackOverflow2013
Postsdbo
PODjango/Python Circular model reference
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODjango/Python Circular model reference
    primarykey
    data
    text
    <p>Ok So I'm TRYING to write nice organized code and actually making seperate django apps instead of lumping everything together into 1. My problem is that I have 3 apps that each reference 1 other model from the next app. So basically I have an endless loop, App A needs to know about B.models.something1 , App B needs to know about C.models.Somthing2, and App C needs to know about A.models.something3 . This of course will not run, for those wondering if this is actually a problem :) .Is there anything resembling a predeclaration of classes so python will know that the classes actually exist? </p> <p>Thanks.</p> <p>EDIT: More Code: Unfortunatly the nature and models of my project are confidential so I'll have to change the names to reflect something completely different , but the code will remain the same.</p> <p>teacher/models.py</p> <pre><code> from django.db import models from myapp.student.models import * from django.contrib.auth.models import User class Teacher(models.Model): """(description)""" user = models.ForeignKey(User) name = models.CharField(max_length=100) phone = models.CharField(max_length=13) phone_ext = models.CharField(blank=True, max_length=5) fax = models.CharField(blank=True, max_length=13) fax_ext = models.CharField(blank=True, max_length=100) url = models.URLField(blank=True, verify_exists=True) complaint = models.ManyToManyField(Complaint) city = models.CharField(blank=True, max_length=100) state = models.CharField(blank=True, max_length=100) postal_code = models.CharField(blank=True, max_length=15) location = models.ManyToManyField(Location) def __unicode__(self): return self.name class Location(models.Model): """(description)""" city = models.CharField(blank=True, max_length=100) state = models.CharField(blank=True, max_length=100) country = models.CharField(blank=False, max_length=100) def __unicode__(self): return self.city + ", " + self.state +", "+self.country </code></pre> <p>student/models.py</p> <pre><code> from django.db import models from django.contrib.auth.models import User from myapp.school.models import School class Student(models.Model): """(Student description)""" user = models.ForeignKey(User) country = models.CharField(max_length=100) state = models.CharField(max_length=100) city = models.CharField(max_length=100) locale = models.CharField(blank=False, max_length=5) learningtype = models.CharField(blank=True, max_length=100) sites = models.TextField(blank=True) def __unicode__(self): return str(self.user) class Complaint(models.Model): """(Complaint description)""" student = models.ForeignKey(Student) site = models.ForeignKey(School) complaint = models.TextField(blank=False) def __unicode__(self): return str(self.site) </code></pre> <p>school/models.py</p> <pre><code> from django.db import models from myapp.teacher.models import Location class School(models.Model): """(School description)""" name = models.CharField(max_length=100) url = models.URLField(verify_exists=True) img = models.ImageField(upload_to="casion_img/") rating = models.FloatField() description = models.CharField(blank=True, max_length=300) goodstanding = models.BooleanField(default=True) location = models.ForeignKey(Location) def __unicode__(self): return self.name </code></pre> <p>So here's what I'm getting:</p> <p>File "/Users/userzero/django/myapp/school/models.py", line 2, in from teacher.models import Location File "/Users/userzero/django/myapp/teacher/models.py", line 2, in from student.models import Complaint File "/Users/userzero/django/myapp/student/models.py", line 3, in from school.models import School File "/Users/userzero/django/myapp/casino/models.py", line 2, in from teacher.models import Location ImportError: cannot import name Location</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USUserZer0
    1. USUserZer0
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PODjango/Python Circular model reference
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PODjango/Python Circular model reference
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PODjango/Python Circular model reference
      1. USiamsk
      1. VTFavorite
    1. COImport cycles are not necessarily a problem. But without more code we can't figure out what it really is.
      singulars
      1. PODjango/Python Circular model reference
      1. USIgnacio Vazquez-Abrams
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload