Question

我正在尝试将一个外键添加到posts类，以便每个人都可以有多个帖子，但我不断收到外键不匹配错误。这些表是空的。我不明白这里是什么问题。

"""
Definition of models.
"""

from django.db import models

# Create your models here.

class Users(models.Model):
   name = models.CharField(primary_key=True, max_length=30)

class Posts(models.Model):
     priority = models.CharField(max_length=30)
     client = models.CharField(max_length=30)
     title = models.CharField(max_length=150)
     assigned_to = models.ForeignKey(Users, on_delete=models.CASCADE)
     exp_comp_time = models.FloatField(max_length=4)
     percent_comp = models.FloatField(max_length=4)
     post_date = models.CharField(max_length=20)
     due_date = models.CharField(max_length=20)
     latest_mod = models.CharField(max_length=20, null=True)


>>> newPost = Posts(priority="low", client="maserati", title="models", 
assigned_to=newUser.name, exp_comp_time=5.5, percent_comp=75.2, 
post_date="6/25/19", due_date="7/1/19")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File 
repos\DjangoWebProject1\DjangoWebProject1\office_proj_en 
v\lib\site-packages\django\db\models\base.py", line 483, in __init__
_setattr(self, field.name, rel_obj)
File 
repos\DjangoWebProject1\DjangoWebProject1\office_proj_en 
v\lib\site-packages\django\db\models\fields\related_descriptors.py", line 
211, 
in __set__
self.field.remote_field.model._meta.object_name,
ValueError: Cannot assign "'Dave'": "Posts.assigned_to" must be a "Users" 
instance.


>>> newPost = Posts(priority="low", client="maserati", title="models", 
assigned_to="Dave", exp_comp_time=5.5, percent_comp=75.2, 
post_date="6/25/19", due_date="7/1/19")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File 
repos\DjangoWebProject1\DjangoWebProject1\office_proj_en 
v\lib\site-packages\django\db\models\base.py", line 483, in __init__
_setattr(self, field.name, rel_obj)
File 
repos\DjangoWebProject1\DjangoWebProject1\office_proj_en 
v\lib\site-packages\django\db\models\fields\related_descriptors.py", line 
211, in __set__
self.field.remote_field.model._meta.object_name,
ValueError: Cannot assign "'Dave'": "Posts.assigned_to" must be a "Users" 
instance.

当我进行迁移时，出现此错误： django.db.utils.operationalError：外键不匹配-引用“ app_users”的“ app_posts”

Django Foreignkey不匹配错误，不允许类在数据库中具有关联

0 个答案: