django-admin自定义登录

这个效果，单位代码是User model 的一个外键Company
通过修改form，然后在前端显示
修改form

class AuthenticationForm(forms.Form):
    """
    Base class for authenticating users. Extend this to get a form that accepts
    username/password logins.
    """
    username = forms.CharField(max_length=254)
    password = forms.CharField(label=_("Password"), widget=forms.PasswordInput)
#自定义一个company_form
    company = forms.CharField(max_length=254)

    error_messages = {
        'invalid_login': _("Please enter a correct %(username)s and password. "
                           "Note that both fields may be case-sensitive."),
        'inactive': _("This account is inactive."),
    }

    def __init__(self, request=None, *args, **kwargs):
        """
        The 'request' parameter is set for custom auth use by subclasses.
        The form data comes in via the standard 'data' kwarg.
        """
        self.request = request
        self.user_cache = None
        super(AuthenticationForm, self).__init__(*args, **kwargs)

        # Set the label for the "username" field.
        UserModel = get_user_model()
        self.username_field = UserModel._meta.get_field(UserModel.USERNAME_FIELD)
        if self.fields['username'].label is None:
            self.fields['username'].label = capfirst(self.username_field.verbose_name)

    def clean(self):
        username = self.cleaned_data.get('username')
        password = self.cleaned_data.get('password')
#有修改
        company = self.cleaned_data.get('company')
        if username and password and company:
            self.user_cache = authenticate(username=username,
                                           password=password,
                                           company=company)
            if self.user_cache is None:
                raise forms.ValidationError(
                    self.error_messages['invalid_login'],
                    code='invalid_login',
                    params={'username': self.username_field.verbose_name},
                )
            else:
                self.confirm_login_allowed(self.user_cache)

        return self.cleaned_data

在admin form 当中找到这串代码，主要是admin login 登录界面会引用，修改部分代码然后在views当中修改login

from forms import AuthenticationForm
@deprecate_current_app
@sensitive_post_parameters()
@csrf_protect
@never_cache
def login(request, template_name='admin/login.html',
          redirect_field_name=REDIRECT_FIELD_NAME,
          authentication_form=AuthenticationForm,
          extra_context=None):
    """
    Displays the login form and handles the login action.
    """
    redirect_to = request.POST.get(redirect_field_name,
                                   request.GET.get(redirect_field_name, ''))

    if request.method == "POST":
        form = authentication_form(request, data=request.POST)
        if form.is_valid():

            # Ensure the user-originating redirection url is safe.
            if not is_safe_url(url=redirect_to, host=request.get_host()):
                redirect_to = resolve_url(settings.LOGIN_REDIRECT_URL)

            # Okay, security check complete. Log the user in.
            auth_login(request, form.get_user())

            return HttpResponseRedirect(redirect_to)
    else:
        form = authentication_form(request)

    current_site = get_current_site(request)

    context = {
        'form': form,
        redirect_field_name: redirect_to,
        'site': current_site,
        'site_name': current_site.name,
    }
    if extra_context is not None:
        context.update(extra_context)

    return TemplateResponse(request, template_name, context)

引用自定义的form然后跳转到自定义的login页面

{% extends "admin/base_site.html" %}
{% load staticfiles %}

{% load i18n admin_static %}


{% block extrastyle %}{{ block.super }}{{ form.media }}<link rel="stylesheet" type="text/css" href='{% static "admin/css/login.css" %}'>
{% endblock %}

{% block bodyclass %}{{ block.super }} login{% endblock %}

{% block usertools %}{% endblock %}

{% block nav-global %}{% endblock %}

{% block content_title %}{% endblock %}

{% block breadcrumbs %}{% endblock %}

{% block content %}
{% if form.errors and not form.non_field_errors %}
<p class="errornote">
{% if form.errors.items|length == 1 %}{% trans "Please correct the error below." %}{% else %}{% trans "Please correct the errors below." %}{% endif %}
</p>
{% endif %}

{% if form.non_field_errors %}
{% for error in form.non_field_errors %}
<p class="errornote">
    {{ error }}
</p>
{% endfor %}
{% endif %}

<div id="content-main">

{% if user.is_authenticated %}
<p class="errornote">
{% blocktrans with username=request.user.get_username trimmed %}
    You are authenticated as {{ username }}, but are not authorized to
    access this page. Would you like to login to a different account?
{% endblocktrans %}
</p>
{% endif %}

<form action="{{ app_path }}" method="post" id="login-form">{% csrf_token %}
<div class="form-row">
    {{ form.company.errors }}
    <p>公司代码</p>
    {{ form.company }}
  </div>
  <div class="form-row">
    {{ form.username.errors }}
    <p>用户名</p>
    {{ form.username }}
  </div>
  <div class="form-row">
    {{ form.password.errors }}
    {{ form.password.label_tag }} {{ form.password }}
    <input type="hidden" name="next" value="{{ next }}" />
  </div>
  {% url 'admin_password_reset' as password_reset_url %}
  {% if password_reset_url %}
  <div class="password-reset-link">
    <a href="{{ password_reset_url }}">{% trans 'Forgotten your password or username?' %}</a>
  </div>
  {% endif %}
  <div class="submit-row">
    <label>&nbsp;</label><input type="submit" value="{% trans 'Log in' %}" />
  </div>
</form>
/*调节样式*/
<script type="text/javascript">
document.getElementById('id_username').focus();
var company = document.getElementById('id_company');
company.style.height = '23px';
company.style.width = '339px';
</script>
</div>
{% endblock %}