如何在 python Django 中保存到数据库之前进行逻辑操作

Question

所以我是 Django 的新手，我想在我的应用程序中做一些硬件兼容性检查功能，我制作一个表格来填写并检查数据库的兼容性，然后显示结果。 但问题是表单似乎只是继续保存到数据库而不首先处理逻辑操作。 这是我的看法

class CreateSimView(LoginRequiredMixin, CreateView):
    login_url = '/login/'
    model = Simulation
    form_class = SimPostForm
    template_name = 'sim_post.html'
    redirect_field_name = 'sim/sim.html'


    def simpost(request):
        mtb = Motherboard.objects.all()
        cpu = Cpu.objects.all()
        vga = Vga.objects.all()
        ram = Ram.objects.all()
        storage = Storage.objects.all()

        mtbform = request.GET.get('mtb_name')
        cpuform = request.GET.get('cpu_name')
        vgaform = request.GET.get('vga_name')
        ramform = request.GET.get('ram_name')
        strform = request.GET.get('str_name')

        simcpu = cpu.objects.values_list('socket', flat=True).filter(name__icontains=cpuform)
        simcpu1 = mtb.objects.values_list('socket', flat=True).filter(name__icontains=mtbform)

        simvga = vga.objects.values_list('vga_interface', flat=True).filter(name__icontains=vgaform)
        simvga1 = mtb.objects.values_list('vga_interface', flat=True).filter(name__icontains=mtbform)

        simram = ram.objects.values_list('mem_type', flat=True).filter(name__icontains=ramform)
        simram1 = mtb.objects.values_list('mem_type', flat=True).filter(name__icontains=mtbform)

        simstr = str.objects.values_list('str_interface', flat=True).filter(name__icontains=strform)
        simstr1 = mtb.objects.values_list('str_interface', flat=True).filter(name__icontains=mtbform)

        if simcpu == simcpu1 :
            if simvga == simvga1:
                if simram == simram1:
                    if simstr == simstr1:
                        form = SimPostForm(request.POST)
                        if form.is_valid():
                            form.save()
                        return render(mtbform,cpuform,vgaform,ramform,strform,"/")
                    else:
                        strform = "not compatible"
                        return render(mtbform,cpuform,vgaform,ramform,strform,"/")
                else:
                    ramform = "not compatible"
                    return render(mtbform,cpuform,vgaform,ramform,strform,"/")
            else:
                vgaform = "not compatible"
                return render(mtbform,cpuform,vgaform,ramform,strform,"/")
        else:
            cpuform = "not compatible"
            return render(mtbform,cpuform,vgaform,ramform,strform,"/")

我的表格模型

class Simulation(models.Model):
    build_name = models.CharField(blank=False, max_length=150)
    mtb_name = models.CharField(blank=False, max_length=150)
    cpu_name = models.CharField(blank=False, max_length=150)
    vga_name = models.CharField(blank=False, max_length=150)
    ram_name = models.CharField(blank=False, max_length=150)
    str_name = models.CharField(blank=False, max_length=150)

    def __str__(self):
        return self.build_name

    def get_absolute_url(self):
        return reverse('sim:sim_post')

和我的模板

{% extends "base.html" %}
{% load bootstrap4 %}
{% block content %}
  <div class="container">
    <div class="jumbotron">
      <h1>Pilih Parts</h1>
        <form method="post" enctype="multipart/form-data">
          {% csrf_token %}
          <div class="form-group">
            <label for="build">Nama Rakitan</label>
          <input class="form-control" type="text" id="build" name="build_name" value="{{ form.build_name.value|default_if_none:"" }}">
          </div>
          <div class="form-group">
            <label for="mtb">Motherboard</label>
          <input class="form-control" id="mtb" type="text" name="mtb_name" value="{{ form.mtb_name.value|default_if_none:"" }}">
        </div>
        <div class="form-group">
          <label for="vga">Vga</label>
          <input class="form-control" id="vga" type="text" name="vga_name" value="{{ form.vga_name.value|default_if_none:"" }}">
        </div>
        <div class="form-group">
          <label for="ram">Ram</label>
          <input class="form-control" type="text" id="ram" name="ram_name" value="{{ form.ram_name.value|default_if_none:"" }}">
        </div>
        <div class="form-group">
          <label for="storage">Storage</label>
          <input class="form-control" type="text" id="storage" name="str_name" value="{{ form.storage_name.value|default_if_none:"" }}">
        </div>
        <div class="form-group">
          <label for="cpu">Cpu</label>
          <input class="form-control" type="text" id="cpu" name="cpu_name" value="{{ form.cpu_name.value|default_if_none:"" }}">
        </div>
          <button type="submit" class="btn btn-secondary">Cek Kompatibilitas</button>
        </form>
    </div>
  </div>
{% endblock %}

我还在我的表单中使用{{ form.storage_name.value|default_if_none:"" }}希望它会返回之前的值。 但它似乎没有这样做。

Answer 1

在我看来，你实现了你的逻辑

def simpost(request)

但是您错过了将这个 function 的调用集成到 CreateView 的预定义处理中。

所以一种方法可能是覆盖

def post(self, request, *args, **kwargs)

CreateView 并将您的逻辑放在那里。 如果一切正常，你应该打电话

super().form_valid(your_form_object_here)

使用 CreateView 的预定义操作触发数据的创建。