django批量form表单处理

1.应用说明

　　一般在表单信息录入中，如果存在许多重复提交的信息，我们就需要进行批量处理，比如学生信息的批量录入。

　　这里一种方式就是使用xlrd模块处理，把学生信息录入到系统内

　　另外一种方式就是采用我们from组件中提供的formset来进行批量处理，实现用户在同一页面提交多张表单

2.相关源码

formsets.py

def formset_factory(form, formset=BaseFormSet, extra=1, can_order=False,
can_delete=False, max_num=None, validate_max=False,
min_num=None, validate_min=False):
"""Return a FormSet for the given form class."""
if min_num is None:
min_num = DEFAULT_MIN_NUM
if max_num is None:
max_num = DEFAULT_MAX_NUM
# hard limit on forms instantiated, to prevent memory-exhaustion attacks
# limit is simply max_num   DEFAULT_MAX_NUM (which is 2*DEFAULT_MAX_NUM
# if max_num is None in the first place)
absolute_max = max_num   DEFAULT_MAX_NUM
attrs = {'form': form, 'extra': extra,
'can_order': can_order, 'can_delete': can_delete,
'min_num': min_num, 'max_num': max_num,
'absolute_max': absolute_max, 'validate_min': validate_min,
'validate_max': validate_max}
return type(form.__name__   str('FormSet'), (formset,), attrs)

该函数主要用来处理表单集

3.批量添加案例

models.py

from django.db import models
class User(models.Model):
user = models.CharField(max_length=32)
pwd = models.CharField(max_length=32)
email = models.CharField(max_length=32)

urls.py

from django.conf.urls import url
from django.contrib import admin
from app01 import views
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^index/', views.index),
]

viewspy

from django.shortcuts import render,HttpResponse
from django import forms
from app01 import models
"""
class UserForm(forms.Form):
id = forms.CharField(required=True)
user = forms.CharField(required=True)
pwd = forms.CharField(required=True)
email = forms.CharField(required=True)
"""
# 简写版
class UserForm(forms.ModelForm):
class Meta:
model = models.User
fields ="__all__"
def index(request):
# 生成一个类,它是form集合。extra设置展示的表单数量
UserFormSet = forms.formset_factory(UserForm,extra=3,)
if request.method == 'GET':
formset = UserFormSet()
return render(request,"index.html",{'formset':formset})
formset = UserFormSet(request.POST)
if formset.is_valid():
flag = False  # 标志位
for row in formset.cleaned_data:
if row:
# **表示将字典扩展为关键字参数
res = models.User.objects.create(**row)
if res:  # 判断返回信息
flag = True
if flag:
return HttpResponse('添加成功')
else:
return HttpResponse('添加失败')
return render(request, "index.html", {'formset': formset})

index.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form method="post">
{{ formset.management_form }}
{% csrf_token %}
<table border="1">
<tr>
<th>用户名</th>
<th>密码</th>
<th>邮箱</th>
</tr>
{% for form in formset %}
<tr>
{% for field in form %}
<td>{{ field }} {{ field.errors.0 }} </td>
{% endfor %}
</tr>
{% endfor %}
</table>
<input type="submit" value="提交">
</form>
</body>
</html>

效果：

直接点击提交，返回添加失败，只添加一行数据，返回添加成功，添加部分数据：

它会返回提示信息，填写完后查看数据库：

4.批量修改案例

　　这里其实在页面渲染出来数据，再进行修改在全部写入即可，当中获取它修改的表单id，以及使用initial方法

在上面的基础上在做修改：

views.py

from django.shortcuts import render
from django import forms
from app01 import models
class UserForm(forms.Form):
id = forms.CharField(required=True)
user = forms.CharField(required=True)
pwd = forms.CharField(required=True)
email = forms.CharField(required=True)
def index(request):
queryset = models.User.objects.all().values()
UserFormSet = forms.formset_factory(UserForm,extra=0)
if request.method == 'GET':
#  initial 参数用来给 ModelForm 定义初始值
formset = UserFormSet(initial=queryset)
return render(request,'index.html',{'formset':formset})
formset = UserFormSet(request.POST)
if formset.is_valid():
for row in formset.cleaned_data:
# 删除字典携带的id
id = row.pop('id')
models.User.objects.filter(id=id).update(**row)
return render(request, 'index.html', {'formset': formset})

index.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.hide{
display: none;
}
</style>
</head>
<body>
<form method="post">
{{ formset.management_form }}
{% csrf_token %}
<table border="1">
<tr>
<th>用户名</th>
<th>密码</th>
<th>邮箱</th>
</tr>
{% for form in formset %}
<tr>
{% for field in form %}
{% if forloop.first %}
<td class="hide">{{ field }} </td>
{% else %}
<td>{{ field }} {{ field.errors.0 }} </td>
{% endif %}
{% endfor %}
</tr>
{% endfor %}
</table>
<input type="submit" value="提交">
</form>
</body>
</html>