FrankYou don't have to import the class for the FK. Instead do a "lazy
import".That means you just use "appname.Modelname" and Django is smart enough
to fugure it out.CheersMike--(Unsigned mail from my phone)
-------- Original message --------From: frank dilorenzo <frankdi...@gmail.com>
Date: 5/6/21 01:20 (GMT+10:00) To: Django users
<django-users@googlegroups.com> Subject: Re: model configuration Thank Mike. I
am sorry for all this code but I am including it to show the problem I can't
resolve. I have 3 apps, shipment, supplier, specie. This is the models for
them.from django.db import modelsfrom .models import Shipmentfrom django.utils
import timezone# Create your models here.# A specie can belong to many
shipmentsclass Specie(models.Model): shipment =
models.ManyToManyField(Shipment) name = models.CharField(max_length=120,
null=True) image = models.ImageField(upload_to="species",
default="no_picture.png") created =
models.DateTimeField(default=timezone.now) def __str__(self): return
self.name===================from django.db import modelsfrom .models import
Supplier# Create your models here.# A shipment can have many speciesclass
Shipment(models.Model): supplier = models.ForeignKey(Supplier,
on_delete=models.CASCADE) slabel = models.CharField(max_length=10)
received = models.PositiveIntegerField(default=0) bad =
models.PositiveIntegerField(default=0) non =
models.PositiveIntegerField(default=0) doa =
models.PositiveIntegerField(default=0) para =
models.PositiveIntegerField(default=0) released =
models.PositiveIntegerField(default=0) entered =
models.BooleanField(default=False) created =
models.DateTimeField(auto_now_add=True) def __str__(self): return
f"{self.slabel}"======================from django.db import models# Create your
models here.# Supplier can have many shipmentsclass Supplier(models.Model):
name = models.CharField(max_length=120, null=True) phone =
models.CharField(max_length=15, null=True) email =
models.CharField(max_length=120, null=True) created =
models.DateTimeField(auto_now_add=True) updated =
models.DateTimeField(auto_now=True) def __str__(self): return
self.namethe error I can't resolve is:ImportError: cannot import name
'Supplier' from partially initialized module 'shipment.models' (most likely due
to a circular import)
(/Users/frankd/django_projects/tryit/src/shipment/models.py)thanks again.On
Thursday, June 3, 2021 at 10:47:07 PM UTC-5 Mike Dewhirst wrote:On 4/06/2021
1:39 pm, Mike Dewhirst wrote:
> On 4/06/2021 11:34 am, frank dilorenzo wrote:
>> I have the following conditions.
>> A supplier can have many shipments.
>> A shipment can have many species.
>> A shipment can have only one supplier.
>> Species can belong to many shipments.
>
> supplier 1:n shipment
> shipment n:m species
shipment has FK to supplier
species has m2m field with shipment
The latter implements a connecting table between species and shipment
which can be expanded to carry additional information if you need to
include anything related to a particular shipment + species
In all this I refer to the word species in its singular sense. E.g., we
are members of the human species.
>
>>
>> No matter how I try I can't seem to configure the models correctly.
>> I was hoping someone could help me on this.
>>
>> Thank you.
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>>
>>
>
>
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