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json - 我收到 django.db.utils.IntegrityError: FOREIGN KEY constraint failed in cmd

问题描述

我从网上复制了一个json文件。我将它用于 django 项目。我在 cmd 中输入了以下几行 -

>>> import json
>>> from blog.models import Post
>>> with open('posts.json') as f:
...   posts_json=json.load(f)
...
>>> for post in posts_json:
...   post = Post(title=post['title'], content=post['content'], author_id=post['
user_id'])
...   post.save()
...

我得到的错误是 -

Traceback (most recent call last):
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\backends\utils.py", line 86, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\backends\sqlite3\base.py", line 396, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.IntegrityError: FOREIGN KEY constraint failed

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<console>", line 3, in <module>
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\models\base.py", line 745, in save
    self.save_base(using=using, force_insert=force_insert,
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\models\base.py", line 782, in save_base
    updated = self._save_table(
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\models\base.py", line 887, in _save_table
    results = self._do_insert(cls._base_manager, using, fields, returning_fields
, raw)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\models\base.py", line 924, in _do_insert
    return manager._insert(
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\models\manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\models\query.py", line 1204, in _insert
    return query.get_compiler(using=using).execute_sql(returning_fields)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\models\sql\compiler.py", line 1391, in execute_sql
    cursor.execute(sql, params)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\backends\utils.py", line 100, in execute
    return super().execute(sql, params)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\backends\utils.py", line 68, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._e
xecute)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\backends\utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\backends\utils.py", line 86, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\backends\utils.py", line 86, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\Admin\.virtualenvs\my_projects-I2onQxk3\lib\site-packages\djang
o\db\backends\sqlite3\base.py", line 396, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: FOREIGN KEY constraint failed

这是我的 models.py 文件 -

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User
from django.urls import reverse

class Post(models.Model):
    title=models.CharField(max_length=100)
    content=models.TextField()
    date_posted=models.DateTimeField(default=timezone.now)
    author=models.ForeignKey(User,on_delete=models.CASCADE)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('post-detail',kwargs={'pk':self.pk})

这是我从网上复制的 json 文件https://raw.githubusercontent.com/CoreyMSchafer/code_snippets/master/Django_Blog/snippets/posts.json

标签： jsondjangosqlite

解决方案

这是稍后的回复，但将来可能会对其他人有所帮助。

我现在遇到了同样的问题和相同的代码，posts.json而且它似乎posts.json是user_id1 或 2，所以错误意味着您的数据库中没有 id 为 1 或 2 的用户。

我会说没有用户，id = 2我想你已经创建了一个超级用户，id = 1如果你创建了第二个用户，它可能不需要id = 2，所以你需要找出那个 id 是什么并在你的posts.json文件中更改它。

这就是我刚刚解决问题的方法。

对不起我的英语不好。

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