[django]Manipulator解惑
代码下载:/Files/maplye/django/Study914.rar
Manipulator英语翻译成“操纵器”,你可以用它来创建,修改,验证你的一个实体对象,并结合FormWrapper可以自动生成页面上Html代码(注:FormWrapper是用来生成html代码,Manipulator使为FormWrapper提供数据和数据模型等)。
Manipulator英语翻译成“操纵器”,你可以用它来创建,修改,验证你的一个实体对象,并结合FormWrapper可以自动生成页面上Html代码(注:FormWrapper是用来生成html代码,Manipulator使为FormWrapper提供数据和数据模型等)。
django系统已经带有两种Manipulator,一是AddManipulator,二是ChangeManipulator,我以前一直以为这是model的两个方法,还有ChangeManipulator我以为是为我的model更换一个Manipulator,其实他是两个不同的类。这两个类能够自动根据model来生成validation和save。AddManipulator和ChangeManipulator都是继承自Manipulator,不同的是ChangeManipulator带有一objectid的构造参数,并获取一object赋值给他的original_object属性,并在save方法使用修改对象,然后保存该对象。
关于这两种Manipulator的使用,可以参考django document:
除了django提供的两种Manipulator,我们还可以自定义Manipulator,这样我们定义自己的fields,validation,save等等。
如:
from django import forms
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
urgency_choices = (
(1, "Extremely urgent"),
(2, "Urgent"),
(3, "Normal"),
(4, "Unimportant"),
)
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class ContactManipulator(forms.Manipulator):
def __init__(self):
self.fields = (
forms.EmailField(field_name="from", is_required=True),
forms.TextField(field_name="subject", length=30, maxlength=200, is_required=True),
forms.SelectField(field_name="urgency", choices=urgency_choices),
forms.LargeTextField(field_name="contents", is_required=True),
)
def save(self): #![](https://www.cnblogs.com/Images/dot.gif)
.
而且我们还可以定义带有初始化参数的custom Manipulator
如:
class ContactManipulator(forms.Manipulator):
def __init__(self,object_id=None):
self.object_id = object_id
self.fields = (
forms.EmailField(field_name="fromEmail", is_required=True),
forms.TextField(field_name="subject", length=30, maxlength=200, is_required=True),
forms.SelectField(field_name="urgency", choices=urgency_choices),
forms.LargeTextField(field_name="contents", is_required=True),
)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
def save(self, new_data):
fromemail = new_data["fromEmail"]
subject = new_data["subject"]
urgency = new_data["urgency"]
contents = new_data["contents"]
if self.object_id:
obj = Contact.objects.get(pk=int(self.object_id))
obj.fromEmail = fromemail
obj.subject = subject
obj.urgency = urgency;
obj.contents = contents;
else:
obj = Contact(fromEmail=fromemail, subject=subject, urgency=urgency,contents=contents)
obj.save()
你看上面ContactManipulator的Manipulator就具有AddManipulator和ChangeManipulator两个的功能,
那这个ContactManipulator应该怎么用呢
#创建
def contact_form(request):
manipulator = ContactManipulator()
if request.POST:
new_data = request.POST.copy()
errors = manipulator.get_validation_errors(new_data)
if not errors:
manipulator.do_html2python(new_data)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
manipulator.save(new_data)
return HttpResponseRedirect("/formapp/contact/")
else:
errors = new_data = {}
form = forms.FormWrapper(manipulator, new_data, errors)
return render_to_response('places/contact_form.html', {'form': form})
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
#修改
def editcontact(request,contactid):
manipulator = ContactManipulator(contactid)
if request.POST:
new_data = request.POST.copy()
errors = manipulator.get_validation_errors(new_data)
if not errors:
manipulator.do_html2python(new_data)
manipulator.save(new_data)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
# Do a post-after-redirect so that reload works, etc.
return HttpResponseRedirect("/formapp/contact/1")
else:
errors = {}
contact = Contact.objects.get(id = contactid)
new_data = contact.__dict__
form = forms.FormWrapper(manipulator, new_data,errors )
return render_to_response('places/contact_form.html', {'form': form})
以上是我在学习Manipulator时一些个人理解,暂时记录如此,以后我会更深入的了解他们,同时非常感谢limodou的解惑,他真是个热心人,向他学习!
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而且我们还可以定义带有初始化参数的custom Manipulator
如:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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那这个ContactManipulator应该怎么用呢
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以上是我在学习Manipulator时一些个人理解,暂时记录如此,以后我会更深入的了解他们,同时非常感谢limodou的解惑,他真是个热心人,向他学习!