自定义django admin model表单提交的例子

框架(架构)  /  管理员 发布于 7年前   282

如下所示：

希望可以从对admin提交的密码加密，并验证电话号码均为数字。

查看admin.py

from django.contrib import adminclass courseAdmin(admin.ModelAdmin)

我们自定义的管理类，继承与admin.ModelAdmin

查看对应admin模块对应源码

__init__.py

from django.contrib.admin.options import ( HORIZONTAL, VERTICAL, ModelAdmin, StackedInline, TabularInline,FaultyAdmin,)从django.contrib.admin.options导入 ModelAdminoptions.py ModelAdmin源码比较长，就不全部列出了，看比较关键的地方def get_urls(self):  from django.conf.urls import url  def wrap(view):   def wrapper(*args, **kwargs):    return self.admin_site.admin_view(view)(*args, **kwargs)   wrapper.model_admin = self   return update_wrapper(wrapper, view)  info = self.model._meta.app_label, self.model._meta.model_name  urlpatterns = [   url(r'^$', wrap(self.changelist_view), name='%s_%s_changelist' % info),   url(r'^add/$', wrap(self.add_view), name='%s_%s_add' % info),   url(r'^(.+)/history/$', wrap(self.history_view), name='%s_%s_history' % info),   url(r'^(.+)/delete/$', wrap(self.delete_view), name='%s_%s_delete' % info),   url(r'^(.+)/change/$', wrap(self.change_view), name='%s_%s_change' % info),   # For backwards compatibility (was the change url before 1.9)   url(r'^(.+)/$', wrap(RedirectView.as_view(    pattern_name='%s:%s_%s_change' % ((self.admin_site.name,) + info)   ))),  ]  return urlpatterns

可以看到add操作，交由add_view函数

 def add_view(self, request, form_url='', extra_context=None):  return self.changeform_view(request, None, form_url, extra_context)

@csrf_protect_m def changeform_view(self, request, object_id=None, form_url='', extra_context=None):  with transaction.atomic(using=router.db_for_write(self.model)):   return self._changeform_view(request, object_id, form_url, extra_context) def _changeform_view(self, request, object_id, form_url, extra_context):  to_field = request.POST.get(TO_FIELD_VAR, request.GET.get(TO_FIELD_VAR))  if to_field and not self.to_field_allowed(request, to_field):   raise DisallowedModelAdminToField("The field %s cannot be referenced." % to_field)  model = self.model  opts = model._meta  if request.method == 'POST' and '_saveasnew' in request.POST:   object_id = None  add = object_id is None  if add:   if not self.has_add_permission(request):    raise PermissionDenied   obj = None  else:   obj = self.get_object(request, unquote(object_id), to_field)   if not self.has_change_permission(request, obj):    raise PermissionDenied   if obj is None:    return self._get_obj_does_not_exist_redirect(request, opts, object_id)  ModelForm = self.get_form(request, obj)  if request.method == 'POST':   form = ModelForm(request.POST, request.FILES, instance=obj)   if form.is_valid():    form_validated = True    new_object = self.save_form(request, form, change=not add)   else:    form_validated = False    new_object = form.instance   formsets, inline_instances = self._create_formsets(request, new_object, change=not add)   if all_valid(formsets) and form_validated:    self.save_model(request, new_object, form, not add)    self.save_related(request, form, formsets, not add)    change_message = self.construct_change_message(request, form, formsets, add)    if add:     self.log_addition(request, new_object, change_message)     return self.response_add(request, new_object)    else:     self.log_change(request, new_object, change_message)     return self.response_change(request, new_object)   else:    form_validated = False  else:   if add:    initial = self.get_changeform_initial_data(request)    form = ModelForm(initial=initial)    formsets, inline_instances = self._create_formsets(request, form.instance, change=False)   else:    form = ModelForm(instance=obj)    formsets, inline_instances = self._create_formsets(request, obj, change=True)  adminForm = helpers.AdminForm(   form,   list(self.get_fieldsets(request, obj)),   self.get_prepopulated_fields(request, obj),   self.get_readonly_fields(request, obj),   model_admin=self)  media = self.media + adminForm.media  inline_formsets = self.get_inline_formsets(request, formsets, inline_instances, obj)  for inline_formset in inline_formsets:   media = media + inline_formset.media  context = dict(   self.admin_site.each_context(request),   title=(_('Add %s') if add else _('Change %s')) % force_text(opts.verbose_name),   adminform=adminForm,   object_id=object_id,   original=obj,   is_popup=(IS_POPUP_VAR in request.POST or      IS_POPUP_VAR in request.GET),   to_field=to_field,   media=media,   inline_admin_formsets=inline_formsets,   errors=helpers.AdminErrorList(form, formsets),   preserved_filters=self.get_preserved_filters(request),  )  # Hide the "Save" and "Save and continue" buttons if "Save as New" was  # previously chosen to prevent the interface from getting confusing.  if request.method == 'POST' and not form_validated and "_saveasnew" in request.POST:   context['show_save'] = False   context['show_save_and_continue'] = False   # Use the change template instead of the add template.   add = False  context.update(extra_context or {})form = ModelForm(request.POST, request.FILES, instance=obj)

这里找到form表单的内容

form.is_valid()

验证表单内容是否合法，查看这个函数

首先找到ModelForm类

在

django\forms\models.pyclass ModelForm(six.with_metaclass(ModelFormMetaclass, BaseModelForm)): pass

查看BaseModelForm

class BaseModelForm(BaseForm):django\forms\forms.pyclass BaseForm(object): def is_valid(self):  """  Returns True if the form has no errors. Otherwise, False. If errors are  being ignored, returns False.  """  return self.is_bound and not self.errors  @property def errors(self):  "Returns an ErrorDict for the data provided for the form"  if self._errors is None:   self.full_clean()  return self._errorsdef full_clean(self):  """  Cleans all of self.data and populates self._errors and  self.cleaned_data.  """  self._errors = ErrorDict()  if not self.is_bound: # Stop further processing.   return  self.cleaned_data = {}  # If the form is permitted to be empty, and none of the form data has  # changed from the initial data, short circuit any validation.  if self.empty_permitted and not self.has_changed():   return  self._clean_fields()  self._clean_form()  self._post_clean() def _clean_fields(self):  for name, field in self.fields.items():   # value_from_datadict() gets the data from the data dictionaries.   # Each widget type knows how to retrieve its own data, because some   # widgets split data over several HTML fields.   #print(type(name))   print(name,field)   if field.disabled:    value = self.get_initial_for_field(field, name)   else:    value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))   try:    if isinstance(field, FileField):     initial = self.get_initial_for_field(field, name)     value = field.clean(value, initial)    else:     value = field.clean(value)    self.cleaned_data[name] = value    if hasattr(self, 'clean_%s' % name):     value = getattr(self, 'clean_%s' % name)()     self.cleaned_data[name] = value   except ValidationError as e:    #print(e)    self.add_error(name, e)

上面列出函数在表单验证的过程中，顺序调用，可以看到添加错误的主要函数为_clean_fields，虽然没有继续仔细查看，但感觉关键在于field.clean(value)，对应的field在我们声明对应model类时会保存相应字段的信息，这里做检查，如果不符合，则raise ValidationError，符合的haul就把新的数据放入到表单的cleaned_data中。

这一段来自官网的教程，这里指出错误信息的关键字包括，null, blank, invalid, invalid_choice, unique, and unique_for_date。刚才的clean函数应该就是检查这些地方。

The error_messages argument lets you override the default messages that the field will raise. Pass in a dictionary with keys matching the error messages you want to override. Error message keys include null, blank, invalid, invalid_choice, unique, and unique_for_date. Additional error message keys are specified for each field in the Field types section below.

到了这一部，基本已经可以达到目的了，我们可以看到 self.add_error函数。

然后回到options.py的ModelAdmin,我们可以写一个类继承ModelAdmin，然后重写新类的_changeform_view函数，避免对其它部分造成影响。

重写部分如下：

if form.is_valid():    form_validated = True    if not re.match('\d+',form.data['tel']):     form_validated=False     form.add_error('tel','电话号码必须为纯数字')    if not re.match('\d+',form.data['number']):     form_validated=False     form.add_error('number','学工号必须为纯数字')    if not form_validated:     new_object=form.instance    else:     passw=form.data['password']     m=md5()     m.update(passw.encode('utf-8'))     form.data['password']=m.hexdigest()     new_object = self.save_form(request, form, change=not add)

以上这篇自定义django admin model表单提交的例子就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。