即使抛出异常，条目也会进入数据库

Question

所以我有一个表单，它需要一些输入和一个文件字段。我在提交的文件上使用验证器来检查文件的大小。它运行良好，因为我在页面上收到错误说文件太大，但条目仍然进入数据库。

我不知道为什么会这样。我认为在我的情况下引发异常可以解决问题，但事实并非如此。 模型.py

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

# Create your models here.

class CV(models.Model):
    solicitant = models.ForeignKey(User, on_delete=models.CASCADE)
    dataUploadCV = models.DateField(auto_now_add=True)
    nume = models.CharField(max_length=12)
    prenume = models.CharField(max_length=12)
    telefon = models.CharField(max_length=12)
    emailContact = models.EmailField(max_length=40)
    CV = models.FileField(upload_to='documents/%d/%m/%Y', validators=[validate_file_size])
    rezolvata = models.BooleanField(default=False)
    def __str__(self):
        return self.nume + " " + self.prenume + ": " + str(self.CV)

验证器.py

from django.core.exceptions import ValidationError


def validate_file_size(value):
    filesize=value.size

    if filesize > 1:
         raise ValidationError("Fisierul poate avea maxim 5MB.")
    else:
        return value

views.py

from django.shortcuts import render, get_object_or_404
from .models import Oferta, CV
from django.contrib import messages
from django.core.paginator import Paginator

# Create your views here

def incarcarecv(req):
    context = {
        'title': "Incarcare CV | Best DAVNIC73"
    }
    if req.method == 'POST':
        try:
            nume = req.POST['nume']
            prenume = req.POST['prenume']
            telefon = req.POST['telefon']
            email = req.POST['email']
            cv = req.FILES['CV']
            try:
                if(req.user.is_authenticated):
                    cv_upload = CV(
                    solicitant=req.user,
                    nume=nume,
                    prenume=prenume,
                    telefon=telefon,
                    emailContact=email
                    )
                    cv_upload.CV.save(cv.name, cv)
                    cv_upload.full_clean()
                    cv_upload.save()
                    req.user.profile.cvuri.append(cv_upload.id)
                    req.user.profile.save()
                    messages.success(req, 'CV depus cu succes!') 
                else:
                    messages.error(req, 'Trebuie sa fii logat pentru a depune CV-ul!')
            except (ValueError):
                messages.error(req, 'Formularul nu a fost incarcat!')
                messages.info(req, 'Verifica daca esti logat!')
        except:
            messages.error(req, 'Nu ai completat corect campurile sau unul din ele este liber!')
            messages.info(req, 'Ai grija ca toate campurile sa fie completate si ca fisierul sa nu depaseasca 5MB!')
    return render(req, "../templates/pagini/incarcare-cv.html", context)

html文件

{% extends 'base.html' %}
{% load static %}
{% block content %}
            <div class="container container-centru">
                <h1 class="heading-contact">Incarca CV</h1>
                {% include 'partials/_alerts.html' %}
                <form action="{% url 'incarcarecv' %}" method="POST" class="form-contact"  enctype="multipart/form-data">
                    {% csrf_token %}
                        <div class="form-group">
                            <label for="inputnume" class="email-contact">Nume</label>
                            <input type="text" name="nume" class="form-control" id="inputnume" aria-describedby="numeHelp" placeholder="Introdu nume">
                        </div>
                        <div class="form-group">
                                <label for="inputprenume" class="email-contact">Prenume</label>
                                <input type="text" name="prenume" class="form-control" id="inputprenume" aria-describedby="prenumeHelp" placeholder="Introdu prenume">
                        </div>
                        <div class="form-group">
                            <label for="inputtelefon" class="email-contact">Telefon</label>
                            <input type="text" name="telefon" class="form-control" id="inputtelefon" aria-describedby="telefonHelp" placeholder="Introdu telefon">
                        </div>
                        <div class="form-group">
                            <label for="inputemail" class="email-contact">Email</label>
                            <input type="email" name="email" class="form-control" id="inputemail" aria-describedby="emailHelp" placeholder="Introdu email">
                        </div>
                        <div class="form-group">
                                <label for="inputcv" class="email-contact">CV</label>
                                <input type="file" name="CV" accept=".docx,.doc,.pdf,application/msword" class="form-control" id="inputemail" aria-describedby="CVHelp">
                            </div>
                        <div class="form-group form-group-custom">
                                <input type="submit" value="Trimite" class="btn btn-secondary btn-block btn-login-custom">
                                <input type="submit" value="Resetează câmpurile" class="btn btn-secondary btn-block btn-reset-custom">
                        </div>                   
                </form>
            </div>
            <script src="{% static 'javascript/clearMessage.js' %}"></script>                  
{% endblock %}

如果抛出异常，如何使帖子不进入数据库？现在我收到错误，但它仍在进入数据库。 （在django的管理区可以看到）

////编辑：我从代码中删除了与我的问题无关的所有内容。 ////edit2: 添加 HTML 文件

Answer 1

在 Django 中，典型的工作流程是首先运行验证器来验证您尝试提交到数据库中的数据是否“干净”，然后才应该调用 save()。但由于一些怪癖，调用save 不会自动清理数据。

所以工作流程应该是这样的：

...
cv_upload = CV(solicitant=req.user, nume=nume, prenume=prenume, 
               telefon=telefon, emailContact=email)
# call clean before saving as we only want CLEAN data in the DB 
cv_upload.full_clean()
# now that it is relatively clean with Django's validators and our custom validators
# go ahead and save it
cv_upload.save()
...