Manipulator英語翻譯成“操縱器”,你可以用它來創建,修改,驗證你的一個實體對象,並結合FormWrapper可以自動生成頁面上Html代碼(注:FormWrapper是用來生成html代碼,Manipulator使爲FormWrapper提供數據和數據模型等)。
urgency_choices = (
(1, "Extremely urgent"),
(2, "Urgent"),
(3, "Normal"),
(4, "Unimportant"),
)
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): #.
而且我們還可以定義帶有初始化參數的custom Manipulator
如:
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),
)
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()
那這個ContactManipulator應該怎麼用呢
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)
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})
#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)
# 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})
以上是我在學習Manipulator時一些個人理解,暫時記錄如此,以後我會更深入的瞭解他們,同時非常感謝limodou的解惑,他真是個熱心人,向他學習!