如何在Django视图之间传递数据 [英] How to pass data between django views

问题描述

此问题总体上解决了我的问题，但我正在寻找更具体的问题说明。

This questions addresses my question genearally, but I am looking for a more specific explanation.

我希望用户更新一组模型对象，但是，这些对象的查询集将需要首先检索。我的计划是在两个单独的UR /视图中执行此操作，从第一个UR /视图获取查询集信息，然后显示接下来要更新的模型表单集。

I would like a user to update a a group of model objects, however, the queryset for these objects will need to be retrieved first. My plan is to do this in two seperate URs/views, getting the query set info from the first, then displaying the model formset to be updated next.

我的第一个视图给出了所有项目（我的一个模型）的列表，并检索了所选项目的ID。

My first view gives a list of all the the "Project"s (One of my models), and retrieves the id of the project selected.

以下是表单：

class ProjectLookupForm(forms.Form):
    Project_Name = chosenforms.ChosenModelChoiceField(queryset=Project.objects.all())

这里是视图：

def update_project_filter(request):
    project_form = ProjectLookupForm(request.POST or None)
    if request.method == 'POST':
        if project_form.is_valid():
            context = {"project_form":project_form}
            # Get project here and share it with the next view.
            selected_project_id = project_form.cleaned_data["Project_Name"].id
            # Add a new return statement here?
            # Or call update project view from here?
            # Add a redirect button to html?
        else:
            errors = project_form.errors
            context = {"errors":errors, "project_form":project_form}
    else:
        context = {"project_form":project_form}
    return render(request, 'filter_update_project_form.html', context)

As可以看到，我在头脑风暴中包括了一些评论。我的目标是将selected_project_id发送到下一个视图，以便它可以将该ID用作模型表单查询集。

As one can see, I have included some comments brainstorming what my possibilities are. My goal is to send the selected_project_id to this next view, so that it can use that id as a model form query set.

def update_project(request):
    UpdateFormset = modelformset_factory(Sample, fields=("sample_name", "extraction_date", 
                                                     "project", "order", "notebook", "notebook_page"))
    if request.method == 'POST':
        formset = UpdateFormset(request.POST, request.FILES)
        if formset.is_valid():
            formset.save()
            context = {"formset": formset, "project_form":project_form}
        else:
            errors = formset.errors
            context = {"formset":formset, "errors":errors, "project_form":project_form}
    else:
        formset = UpdateFormset(queryset=Sample.objects.filter(project=2))
        context = {"formset":formset, "project_form":project_form}
    return render(request, 'update_project_form.html', context)

在这里可以看到我对查询集进行了硬编码，如下所示：

One can see here that I have hard coded the queryset like so:

queryset=Sample.objects.filter(project=2)

如何为我的selected_project_id设置 project =？我是否将此信息作为输入参数传递给视图？还是我将其发送到下一个URL并从那里获取？

How can I set "project=" to my selected_project_id? Do I pass this info to the view as an input parameter? Or do I send it to the next URL and take it from there?

推荐答案

假设您已激活 django.contrib.sessions.middleware.SessionMiddleware ;您可以使用 request.session 字典在视图之间传递数据，如下所示：

Assuming you've activated django.contrib.sessions.middleware.SessionMiddleware; you can pass data between views using request.session dictionary as follows:

def update_project_filter(request):
    ...
    selected_project_id = project_form.cleaned_data["Project_Name"].id
    request.session['selected_project_id'] = selected_project_id
    ...

def update_project(request):
    ...
    selected_project_id = request.session.get('selected_project_id')
    ...

这篇关于如何在Django视图之间传递数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！