NOT NULL 约束失败：/jobs/add/ 处的jobs_job.created_by_id IntegrityError

Posted 2023-02-24

【中文标题】NOT NULL 约束失败：/jobs/add/ 处的jobs_job.created_by_id IntegrityError

【英文标题】：NOT NULL constraint failed: jobs_job.created_by_id IntegrityError at /jobs/add/

【发布时间】：2021-06-27 00:57:48

【问题描述】：

我正在尝试使用户能够添加工作，并且在填写表单后我收到了该错误。这是我的代码：

models.py

from django.db import models
from django.contrib.auth.models import User


class Job(models.Model):
    title = models.CharField(max_length=255)
    short_description = models.TextField()
    long_description = models.TextField(blank=True, null=True)


    created_by = models.ForeignKey(User, related_name='jobs', on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)
    changed_at = models.DateTimeField(auto_now=True)


    def __str__(self):
        return self.title 

views.py

from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required

from .forms import AddJobForm
from .models import Job

def job_detail(request, job_id):
    job = Job.objects.get(pk=job_id)
    return render(request, 'jobs/job_detail.html', 'job': job)

@login_required
def add_job(request):
    if request.method == 'POST':
        form = AddJobForm(request.POST)

        if form.is_valid():
            job = form.save(commit=True)
            job.created_by = request.user
            job.save()

            return redirect('dashboard')

    else:
        form = AddJobForm()

    return render(request, 'jobs/add_job.html', 'form': form)

forms.py

from django import forms
from .models import Job


class AddJobForm(forms.ModelForm):
    class Meta:
        model = Job
        fields = ['title','short_description','long_description']

我需要做什么来解决这个错误？我尝试从views.py 中删除commit=True，我尝试删除sqlite3 并再次进行迁移。

【参考方案1】：

您正在尝试保存没有created_by 值的对象（因此出现错误消息），然后为该字段分配一个值并再次保存。你应该改变

job = form.save(commit=True)

到

job = form.save(commit=False)

所以第一个.save 实际上不会尝试向数据库提交任何内容。它仅用于构造Job 实例，以便您可以补全任何缺失值并使用job.save() 实际保存它。

请注意，如果您省略 commit= 参数，则假定为 True。