Python Django Viewflow将变量传递到基于函数的视图

试用一个非常简单的测试应用程序，使用基于函数的视图，而不是内置的基于类的视图。预期的想法是添加产品，然后批准（通过两种不同的视图/表格）。有两个问题我似乎无法解决：

我想将

产品

传递到approval视图（这样，进行审批的用户可以看到他们要审批的内容的摘要。我不知道如何做-我尝试通过

flow.py中的
flow.View
传递
product\u pk
，但这会导致一个错误，如果我忽略它，则审批视图会更新所有记录，而不是当前产品。

无论是否检查了产品中的批准字段，flows.py中的

flow.If

gate似乎总是正确的。理想情况下，我希望批准记录在产品模型中，而不是流程模型中

可能是超级基本的错误/概念我错过了-任何帮助将不胜感激

在模型中.py

class Product(models.Model):
    name = models.CharField(max_length=30)
    quantity = models.IntegerField()
    approved = models.BooleanField(default=False)

    def __str__(self):
        return self.name

class ProductProcess(Process):
    product = models.ForeignKey(Product, blank=True, null=True)

    def approved(self):
        return self.product.approved


class ProductTask(Task):
    class Meta:
        proxy = True

class ProductFlow(Flow):
    process_cls = ProductProcess
    task_cls = ProductTask

    start = flow.Start(start_process).Next(this.approve)

    approve = flow.View(approve_product).Next(this.checkapproval)

    checkapproval = flow.If(cond=lambda p: p.approved()) \
        .OnFalse(this.approve) \
        .OnTrue(this.end)

    end = flow.End()

@flow_start_view()
def start_process(request, activation):
    activation.prepare(request.POST or None,)
    form = ProductForm(request.POST or None)

    if form.is_valid():
        Product.objects.create(
            name = form.cleaned_data['name'],
            quantity = form.cleaned_data['quantity']
        )
        activation.done()
        return redirect('/test')

    return render(request, 'viewflowtest/product.html', {'activation': activation, 'form': form})

@flow_view()
def approve_product(request, activation):
    activation.prepare(request.POST or None,)
    form = ApproveProductForm(request.POST or None)

    if form.is_valid():
        Product.objects.update(
            approved = form.cleaned_data['approved']
        )
        activation.done()
        return redirect('/test')
    return render(request, 'viewflowtest/product.html', {'activation': activation, 'form': form})

在flows.py中

class Product(models.Model):
    name = models.CharField(max_length=30)
    quantity = models.IntegerField()
    approved = models.BooleanField(default=False)

    def __str__(self):
        return self.name

class ProductProcess(Process):
    product = models.ForeignKey(Product, blank=True, null=True)

    def approved(self):
        return self.product.approved


class ProductTask(Task):
    class Meta:
        proxy = True

class ProductFlow(Flow):
    process_cls = ProductProcess
    task_cls = ProductTask

    start = flow.Start(start_process).Next(this.approve)

    approve = flow.View(approve_product).Next(this.checkapproval)

    checkapproval = flow.If(cond=lambda p: p.approved()) \
        .OnFalse(this.approve) \
        .OnTrue(this.end)

    end = flow.End()

@flow_start_view()
def start_process(request, activation):
    activation.prepare(request.POST or None,)
    form = ProductForm(request.POST or None)

    if form.is_valid():
        Product.objects.create(
            name = form.cleaned_data['name'],
            quantity = form.cleaned_data['quantity']
        )
        activation.done()
        return redirect('/test')

    return render(request, 'viewflowtest/product.html', {'activation': activation, 'form': form})

@flow_view()
def approve_product(request, activation):
    activation.prepare(request.POST or None,)
    form = ApproveProductForm(request.POST or None)

    if form.is_valid():
        Product.objects.update(
            approved = form.cleaned_data['approved']
        )
        activation.done()
        return redirect('/test')
    return render(request, 'viewflowtest/product.html', {'activation': activation, 'form': form})

在视图中.py

class Product(models.Model):
    name = models.CharField(max_length=30)
    quantity = models.IntegerField()
    approved = models.BooleanField(default=False)

    def __str__(self):
        return self.name

class ProductProcess(Process):
    product = models.ForeignKey(Product, blank=True, null=True)

    def approved(self):
        return self.product.approved


class ProductTask(Task):
    class Meta:
        proxy = True

class ProductFlow(Flow):
    process_cls = ProductProcess
    task_cls = ProductTask

    start = flow.Start(start_process).Next(this.approve)

    approve = flow.View(approve_product).Next(this.checkapproval)

    checkapproval = flow.If(cond=lambda p: p.approved()) \
        .OnFalse(this.approve) \
        .OnTrue(this.end)

    end = flow.End()

@flow_start_view()
def start_process(request, activation):
    activation.prepare(request.POST or None,)
    form = ProductForm(request.POST or None)

    if form.is_valid():
        Product.objects.create(
            name = form.cleaned_data['name'],
            quantity = form.cleaned_data['quantity']
        )
        activation.done()
        return redirect('/test')

    return render(request, 'viewflowtest/product.html', {'activation': activation, 'form': form})

@flow_view()
def approve_product(request, activation):
    activation.prepare(request.POST or None,)
    form = ApproveProductForm(request.POST or None)

    if form.is_valid():
        Product.objects.update(
            approved = form.cleaned_data['approved']
        )
        activation.done()
        return redirect('/test')
    return render(request, 'viewflowtest/product.html', {'activation': activation, 'form': form})

---

所调用的表单是一个非常基本的ModelForm类，URL与GitHub项目页面上的演示应用程序中描述的完全相同。模板具有

{activation.management\u form}

标记。

首先，您需要链接产品和流程。因此，在开始视图中，您可以执行以下操作

if form.is_valid():
    product = Product.objects.create(
        name = form.cleaned_data['name'],
        quantity = form.cleaned_data['quantity']
    )
    activation.process.product = product
    activation.done()

或者更好，如果ProductForm是ModelForm

if form.is_valid():
    product = form.save()
    activation.process.product = product
    activation.done() # here is new process instance created and saved to db

因此，approval视图可以重写为：

@flow_view()
def approve_product(request, activation):
    activation.prepare(request.POST or None,)
    form = ApproveProductForm(request.POST or None, instance=activation.process.product)

    if form.is_valid():
        form.save()  # here is the approved field is updated
        activation.done()
        return redirect('/test')
    return render(request, 'viewflowtest/product.html', {'activation': activation, 'form': form})

此外，您还可以使用基于函数的视图查看viewflow示例-

Kickass！：）非常感谢您提供了超级快速的答案（希望我能够在不发布任何问题的情况下完成viewflow的其余部分！）顺便说一句，到目前为止，该应用程序看起来棒极了