我试着开发一个简单的输入表单来保存渔船的存款。渔船和渔网都是数据库中的表。提交表单时没有错误，但后台没有发生任何事情。我使用PostgreSQL数据库和PgAdmin来获得见解。我有点卡住了，因为这是我第一次使用Django。
我尝试将dep_id字段添加到表单中，但没有任何更改。
[forms.py]

from django import forms
from django.forms import ModelForm
from myapp.models import Deposit

class UploadForm(ModelForm):
    dep_date = forms.DateField()
    harbour = forms.CharField()
    vessel = forms.ModelChoiceField(queryset=Vessel.objects.all())
    net = forms.ModelChoiceField(queryset=Net.objects.all())
    amount = forms.DecimalField()

    class Meta:
        model = Deposit
        fields = ['dep_date', 'harbour', 
                    'vessel', 'net', 
                    'amount']

[models.py]

from django.db import models

class Vessel(models.Model):
    VID = models.IntegerField(primary_key=True, default=None)
    vessel_name = models.CharField(max_length=100)
    flag = models.CharField(max_length=100)
    
    registration_number = models.CharField(max_length=100)
    WIN = models.CharField(max_length=100)
    IRCS = models.CharField(max_length=100)
    
    vessel_type = models.CharField(max_length=250)
    fishing_methods = models.CharField(max_length=255)
    length = models.DecimalField(default=0, max_digits=5, decimal_places=2)
    
    auth_period_from = models.CharField(max_length=100)
    auth_period_to = models.CharField(max_length=100)


class Net(models.Model):
    net_id = models.IntegerField(primary_key=True, default = None)
    prod_date = models.DateField()
    weight = models.DecimalField(default=0, max_digits=6, decimal_places=2)
    material = models.CharField(max_length=100)
    fishing_type = models.CharField(max_length=100, default=None)

class Deposit(models.Model):
    dep_id = models.BigAutoField(primary_key=True, default=None)
    dep_date = models.DateField()
    harbour = models.CharField(max_length=100)
    vessel = models.ForeignKey(Vessel, to_field='VID', on_delete=models.CASCADE)
    net = models.ForeignKey(Net, to_field='net_id', on_delete=models.CASCADE)
    amount = models.DecimalField(default=0, max_digits=5, decimal_places=2)

[views.py]

from django.shortcuts import render, redirect
from .models import Vessel
from .forms import UploadForm

def put_deposit(request):
    if request.POST:    
        form = UploadForm(request.POST)
        print(request)
        if form.is_valid():
            form.save()
        redirect(index)
    return render(request, 'upload.html', {'form' : UploadForm})

[上传. html]

<p> Upload </p>
<form method="POST" action="{% url 'put_deposit' %}" enctype="multipart/form-data"> 
    {% csrf_token %}
    
    {{form}}
    <button> Submit </button>
</form>

也许我有任何类型的依赖性错误或它是一个关键的问题？