自定义django admin model表单提交的例子
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 admin class 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 ModelAdmin
options.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.py class ModelForm(six.with_metaclass(ModelFormMetaclass, BaseModelForm)): pass
查看BaseModelForm
class BaseModelForm(BaseForm):
django\forms\forms.py
class 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._errors
def 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【听图阁-专注于Python设计】。
