python - 如何在本例中激活 ValidationError

Question

我遇到了 ValidationError 问题。

forms.py

from django import forms

class life_contract_data(forms.Form):
    age = forms.CharField()
    period = forms.CharField()
    premium = forms.CharField()
    percentage = forms.CharField()

views.py

from django.shortcuts import render
from .forms import *
from django import forms

def contract_output(request):
    form = life_contract_data(request.POST)

    age = range(int(request.POST['age']),int(request.POST['age'])+int(request.POST['period']))
    period = range(1,int(request.POST['period'])+1)
    premium_period = range(1, int(request.POST['period']))
    premium = (request.POST['premium'])
    percentage = int(request.POST['percentage'])
    premium1 = []
    premium_total_year = []
    premium1.append(int(premium))
    premium_total_year.append(int(premium1[0])*12)

    for pre in premium_period:
        premium1.append((premium1[pre-1]*percentage)/100 + premium1[pre-1])
        premium_total_year.append(int(premium1[pre])*12 + int(premium_total_year[pre-1]))

    if int(request.POST['age']) >= 65:
        death_capital = 50000000
    else:
        death_capital = 100000000

    if int(request.POST['age']) >= 65 and int(request.POST['period']) > 5:
        raise forms.ValidationError("Age must be lower than 65") #THE CRAZY PROBLEM

    return render(request, 'life/contract_output.html', { 
        'form':form, 
        'age':age,
        'period':period, 
        'premium':premium1, 
        'percentage':percentage,
        'death_capital':death_capital,
        'premium_total_year':premium_total_year,
    })

Added template.html

模板.html

<form action="/life/life_contract/contract_output/" method="post">{% csrf_token %}
    {% for field in form %}
        <div class="float" id="form_fields">{{field}}{{field.label}}</div><br />
    {% endfor %}
    <input type="submit" value="Submit" />
</form>

实际上我希望如果用户输入年龄>=65且周期>5，他/她会遇到错误来纠正他/她的输入。但我看到来自 django 的错误消息:

[u'Age must be lower than 65']

问题出在哪里？？？

Answer 1

您遇到的问题是您在 View 中进行验证，而不是让表单在表单的 clean 方法内处理它

class life_contract_data(forms.Form):
    age = forms.CharField()
    period = forms.IntegerField()
    premium = forms.CharField()
    percentage = forms.CharField()

    def clean(self):

        cleaned_data = super(life_contract_data, self).clean()

        if cleaned_data.get('age') >= 65 and cleaned_data.get('period') > 5:
            raise forms.ValidationError("Age must be lower than 65")

        return cleaned_data

您的 View 还需要更改为名为 is_valid

def contract_output(request):
    form = life_contract_data(request.POST)

    if not form.is_valid():
        return render(request, 'life/contract_output.html', { 'form':form })

    # Do something if it is valid       

<form action="/life/life_contract/contract_output/" method="post">
    {% csrf_token %}
    {{ form }}
</form>

有关详细信息，请参阅Cleaning and validating fields that depend on each other