Django - 將 Session 變量從一個視圖傳遞到另一個視圖（“請求”未定義）

Question

我已經看過這個（ 從 session 到另一個視圖的 django 變量），但我相信期望的結果是完全不同的。

我的views.py 文件中有兩個視圖：projectcreation 和projectconfirm。 用戶在 projectcreation 視圖中填寫表格后，我希望他們被引導到一個確認頁面，該頁面在繼續創建項目之前提供變量的只讀視圖。

我的 views.py 文件如下所示：

from django.shortcuts import render
from django.http import HttpResponse
from .projectform import ProjectForm
from .projectconfirm import ProjectConfirm

def projectcreation(request):
    if request.method == 'POST':
        form = ProjectForm(request.POST)
        if form.is_valid():
            request.session['projectname'] = form.cleaned_data['client'] + "-" + form.cleaned_data['stage'] + "-" + form.cleaned_data['purpose']
            request.session['computeapi'] = form.cleaned_data['computeapi']
            request.session['deploymentmanapi'] = form.cleaned_data['deploymentmanapi']
            request.session['storagecompapi'] = form.cleaned_data['storagecompapi']
            request.session['monitorapi'] = form.cleaned_data['monitorapi']
            request.session['loggingapi'] = form.cleaned_data['loggingapi']
            return render(request,'projectconfirm.html')
    else:
        form = ProjectForm()
    return render(request, 'projectform.html', {'form': form})

def projectconfirm(request):
    if request.method =='POST':
        print("Now beginning deployment...")
    else:
        form = ProjectConfirm()
    return render(request, 'projectconfirm.html', {'form': form})

我面臨並且承認不理解的問題是如何在 projectconfirm.py 腳本中加載 session 變量。 我認為像下面這樣的東西會起作用，但它抱怨“請求”是一個未定義的變量：

from django import forms
from django.shortcuts import render
from crispy_forms.helper import FormHelper
from crispy_forms.layout import Layout, Submit, Row, Column, Field, Fieldset

class ProjectConfirm(forms.Form):
    name = forms.CharField(widget=forms.TextInput(attrs={'placeholder': request.session['projectname']}))
    computeapi = forms.CharField(widget=forms.TextInput(attrs={'placeholder': request.session['computeapi']}))
    deploymentmanapi = forms.CharField(widget=forms.TextInput(attrs={'placeholder': request.session['deploymentmanapi']}))
    storagecompapi = forms.CharField(widget=forms.TextInput(attrs={'placeholder': request.session['storagecompapi']}))
    monitorapi = forms.CharField(widget=forms.TextInput(attrs={'placeholder': request.session['monitorapi']}))
    loggingapi = forms.CharField(widget=forms.TextInput(attrs={'placeholder': request.session['loggingapi']}))

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.layout = Layout(
            Fieldset(
                'Project Name',
                Row(
                    Column('name', css_class='form-group col-md-4 mb-0', readonly=True),
                )
            ),
            Fieldset(
                'APIs To Enable',
                Row(
                    Column('computeapi', css_class='form-group col-md-4 mb-0', readonly=True),
                    Column('deploymentmanapi', css_class='form-group col-md-4 mb-0', readonly=True),
                    Column('storagecompapi', css_class='form-group col-md-4 mb-0', readonly=True),
                    Column('monitorapi', css_class='form-group col-md-4 mb-0', readonly=True),
                    Column('loggingapi', css_class='form-group col-md-4 mb-0', readonly=True)
                )
            ),
            Submit('Deploy', 'Deploy', css_class='btn-success')
        )

Answer 1

在表單request的構造函數中可以通過以下方式獲得：

1. 通過**kwargs傳遞它，所以：

# in your view:
form = ProjectConfirm(request=request)

# in ProjectConfirm
class ProjectConfirm(forms.ModelForm):
    name = forms.CharField(widget=forms.TextInput(attrs={}))
    # etc

    def __init__(self, *args, **kwargs):
        request = kwargs.pop("request")
        super().__init__(*args, **kwargs)
        # ... and then define your widgets inside your __init__
        self.fields['name'].widget.attrs['placeholder'] = request.session["projectname"]
        # etc

2. 通過將 Form 定義為視圖的嵌套 class，但它必須是類視圖而不是 function。然后你可以將它傳遞給你的表單，但它仍然不是一個優雅的解決方案，因為它是混合視圖和 ZAC68B423ABFD6A9FE26EAC8888 中的混合模塊。 無論如何，它會是這樣的：

class YourView(FormView):
    def get_form_class(self):
        request = self.request
        class ProjectConfirm(forms.Form):
            # your existing form definition
        return ProjectConfirm

讓我知道它是否對您有幫助。