I'm trying to make my admin login field greater than 30 characters because I'm using a custom Email Authentication backend that doesn't really care how long the username field is.
我正在尝试将我的管理员登录字段设置为大于30个字符，因为我使用的是自定义电子邮件身份验证后端，并不关心用户名字段的长度。
I wanted to set up a monkey_patch app that would apply the change to all admin sites.
我想设置一个monkey_patch应用程序，将应用程序更改到所有管理站点。
from django.contrib.auth.forms import AuthenticationForm
AuthenticationForm.base_fields['username'].max_length = 150 # or whatever
It's not working and I don't see why not.
它不起作用，我不明白为什么不。
The print statements in...
......中的印刷声明
django.contrib.admin.forms.AdminAuthenticationForm- django.contrib.admin.forms.AdminAuthenticationForm
django.contrib.auth.views.login- django.contrib.auth.views.login
-
django.contrib.auth.views.login.form# instantiated form - django.contrib.auth.views.login.form #instantiated form
... shows the correct, modified number when I render the login page via /myadmin/anywhere/.
...当我通过/ myadmin / anywhere /呈现登录页面时，显示正确的修改数字。
Even the form instance in the final render function shows the correct number.
即使最终渲染函数中的表单实例也显示正确的数字。
# django.contrib.auth.views.login
...
print form.fields['username'].max_length # this is an instantiated form!
return render_to_response(template_name, context ...)
What am I missing?
Where is the field magically deciding to be 30 chars long? I don't see where it has a chance to change between my print statement and render_to_response.
这个领域神奇地决定在30个字符长？我没有看到它有机会在我的print语句和render_to_response之间进行更改。
If I pass the admin site a subclassed AuthenticationForm, it works.
如果我通过管理站点传递子类AuthenticationForm，它的工作原理。
class LongerAuthenticationForm(AuthenticationForm):
username = forms.CharField(max_length=150)
class MyAdmin(AdminSite):
login_form = LongerAuthenticationForm
This is all confusing to me because I can see that the form instance passed to the final render function has the correct CharField with max_length=150.
这对我来说很困惑，因为我可以看到传递给最终渲染函数的表单实例具有正确的CharField，其max_length = 150。
3 个解决方案
#1
7
It looks like I need to modify the widget attrs directly.
看起来我需要直接修改小部件attrs。
I forgot that fields are instantiated once!CharField(max_length=30) is already setting the widget attributes for the HTML. No matter how I change max_length on a field instance, the widget has already been generated.
我忘记了字段被实例化了一次！ CharField（max_length = 30）已经为HTML设置了widget属性。无论我如何更改字段实例上的max_length，都已生成窗口小部件。
Here's my solution in my monkey_patch app.
这是我在monkey_patch应用程序中的解决方案。
from django.contrib.auth.forms import AuthenticationForm
AuthenticationForm.base_fields['username'].max_length = 150 # I guess not needed
AuthenticationForm.base_fields['username'].widget.attrs['maxlength'] = 150 # html
AuthenticationForm.base_fields['username'].validators[0].limit_value = 150
I don't really understand why instantiating a new field instance doesn't work..?
我真的不明白为什么实例化一个新的字段实例不起作用..？
AuthenticationForm.base_fields['username'] = forms.CharField(max_length=100)
#2
3
In django 1.3 you can build an app with the following code and make sure you include it in the settings. Its a very similar solution to the accepted one but it extends from AdminAuthenticationForm, otherwise your non-field errors won't get displayed.
在django 1.3中，您可以使用以下代码构建应用程序，并确保将其包含在设置中。它是一个非常类似于已接受的解决方案，但它从AdminAuthenticationForm扩展，否则您的非字段错误将不会显示。
from django.contrib.admin.forms import AdminAuthenticationForm
from django import forms
from django.contrib.admin.sites import AdminSite
class LongerAuthenticationForm(AdminAuthenticationForm):
""" Subclass which extends the max length of the username field. """
username = forms.CharField(max_length=150)
AdminSite.login_form = LongerAuthenticationForm
#3
1
from django.contrib.admin.forms import AdminAuthenticationForm
来自django.contrib.admin.forms导入AdminAuthenticationForm
class ModifiedForm(AdminAuthenticationForm):
username = forms.CharField(max_length=150) #and so on
into urls.py
进入urls.py
from django.contrib import admin
admin.site.login_form = ModifiedForm
...
admin.autodiscover()
#1
7
It looks like I need to modify the widget attrs directly.
看起来我需要直接修改小部件attrs。
I forgot that fields are instantiated once!CharField(max_length=30) is already setting the widget attributes for the HTML. No matter how I change max_length on a field instance, the widget has already been generated.
我忘记了字段被实例化了一次！ CharField（max_length = 30）已经为HTML设置了widget属性。无论我如何更改字段实例上的max_length，都已生成窗口小部件。
Here's my solution in my monkey_patch app.
这是我在monkey_patch应用程序中的解决方案。
from django.contrib.auth.forms import AuthenticationForm
AuthenticationForm.base_fields['username'].max_length = 150 # I guess not needed
AuthenticationForm.base_fields['username'].widget.attrs['maxlength'] = 150 # html
AuthenticationForm.base_fields['username'].validators[0].limit_value = 150
I don't really understand why instantiating a new field instance doesn't work..?
我真的不明白为什么实例化一个新的字段实例不起作用..？
AuthenticationForm.base_fields['username'] = forms.CharField(max_length=100)
#2
3
In django 1.3 you can build an app with the following code and make sure you include it in the settings. Its a very similar solution to the accepted one but it extends from AdminAuthenticationForm, otherwise your non-field errors won't get displayed.
在django 1.3中，您可以使用以下代码构建应用程序，并确保将其包含在设置中。它是一个非常类似于已接受的解决方案，但它从AdminAuthenticationForm扩展，否则您的非字段错误将不会显示。
from django.contrib.admin.forms import AdminAuthenticationForm
from django import forms
from django.contrib.admin.sites import AdminSite
class LongerAuthenticationForm(AdminAuthenticationForm):
""" Subclass which extends the max length of the username field. """
username = forms.CharField(max_length=150)
AdminSite.login_form = LongerAuthenticationForm
#3
1
from django.contrib.admin.forms import AdminAuthenticationForm
来自django.contrib.admin.forms导入AdminAuthenticationForm
class ModifiedForm(AdminAuthenticationForm):
username = forms.CharField(max_length=150) #and so on
into urls.py
进入urls.py
from django.contrib import admin
admin.site.login_form = ModifiedForm
...
admin.autodiscover()