Take another look at the doc's example on formfield_for_manytomany:
https://docs.djangoproject.com/en/3.0/ref/contrib/admin/#django.contrib.admin.ModelAdmin.formfield_for_manytomany
You need to call super() and this isn't the right way to override the
widget.
def formfield_for_manytomany(self, db_field, request, **kwargs):
if db_field.name <http://db_field.name> == "groups":
kwargs["widget"] = CommonFilteredSelectMultiple
return super().formfield_for_manytomany(db_field, request,
**kwargs)
On Sun, Jan 5, 2020 at 11:05 PM Mike Dewhirst <mi...@dewhirst.com.au
<mailto:mi...@dewhirst.com.au>> wrote:
Significant refinement of the error ...
Trying to use formfield_for_manytomany() triggers the error even
if all
it does is "pass"
Something fishy ... I'll write a fresh question.
Mike
On 6/01/2020 12:46 pm, Mike Dewhirst wrote:
> This error occurs in the Admin for my custom user when I try to
> specify a custom widget for permission groups. I haven't included
> 'groups' in any raw_id_fields, radio_fields or autocomplete_fields.
> The groups are correctly displayed in the Admin user page with the
> default FilteredSelectMultiple widget.
>
> This is the relevant code in admin.py ... (traceback below)
>
> class CommonUserAdmin(UserAdmin):
>
> model = get_user_model()
>
> def formfield_for_manytomany(self, db_field, request, **kwargs):
>
> if db_field.name <http://db_field.name> == "groups":
> formfield_overrides = {
> models.ManyToManyField: {'widget':
> CommonFilteredSelectMultiple},
> }
> ...
>
> If I omit the formfield_for_manytomany() method and just run
> formfield_overrides nakedly nothing happens - presumably because
the
> admin doesn't consider "groups" is a ManyToManyField at that point.
>
> How do I persuade the Admin to use my widget?
>
> Thanks for any advice
>
> Mike
>
>
>
> Environment:
>
>
> Request Method: GET
> Request URL: http://localhost:8000/admin/common/user/59/change/
>
> Django Version: 2.2.9
> Python Version: 3.7.4
> Installed Applications:
> ['django.contrib.auth',
> 'django.contrib.contenttypes',
> 'django.contrib.sessions',
> 'django.contrib.sites',
> 'django.contrib.messages',
> 'django.contrib.admin',
> 'django.contrib.admindocs',
> 'django.contrib.staticfiles',
> 'common',
> 'billing',
> 'company',
> 'credit',
> 'refer',
> 'regulation',
> 'substance',
> 'workplace']
> Installed Middleware:
> ['django.middleware.cache.UpdateCacheMiddleware',
> 'django.middleware.security.SecurityMiddleware',
> 'django.contrib.sessions.middleware.SessionMiddleware',
> 'django.middleware.locale.LocaleMiddleware',
> 'django.middleware.common.CommonMiddleware',
> 'django.middleware.csrf.CsrfViewMiddleware',
> 'django.contrib.auth.middleware.AuthenticationMiddleware',
> 'django.contrib.messages.middleware.MessageMiddleware',
> 'django.contrib.admindocs.middleware.XViewMiddleware',
> 'django.middleware.clickjacking.XFrameOptionsMiddleware',
> 'pwned_passwords_django.middleware.PwnedPasswordsMiddleware',
> 'django.middleware.cache.FetchFromCacheMiddleware']
>
>
> Template error:
> In template
>
D:\Users\mike\envs\xxex3\lib\site-packages\django\contrib\admin\templates\admin\includes\fieldset.html,
> error at line 7
> Key 'groups' not found in 'UserForm'. Choices are: email,
> first_name, is_active, is_staff, last_name, password, username.
> 1 : <fieldset class="module aligned {{ fieldset.classes }}">
> 2 : {% if fieldset.name <http://fieldset.name> %}<h2>{{
fieldset.name <http://fieldset.name> }}</h2>{% endif %}
> 3 : {% if fieldset.description %}
> 4 : <div class="description">{{
fieldset.description|safe
> }}</div>
> 5 : {% endif %}
> 6 : {% for line in fieldset %}
> 7 : <div class="form-row{% if
line.fields|length_is:'1' and
> line.errors %} errors{% endif %}{% if not line.has_visible_field %}
> hidden{% endif %} {% for field in line %} {% if field.field.name
<http://field.field.name> %}
> field-{{ field.field.name <http://field.field.name> }}{% endif
%}{% endfor %}">
> 8 : {% if line.fields|length_is:'1' %}{{ line.errors
> }}{% endif %}
> 9 : {% for field in line %}
> 10 : <div{% if not line.fields|length_is:'1' %}
> class="fieldBox{% if field.field.name <http://field.field.name>
%} field-{{ field.field.name <http://field.field.name>
> }}{% endif %}{% if not field.is_readonly and field.errors %}
errors{%
> endif %}{% if field.field.is_hidden %} hidden{% endif %}"{% elif
> field.is_checkbox %} class="checkbox-row"{% endif %}>
> 11 : {% if not line.fields|length_is:'1' and
> not field.is_readonly %}{{ field.errors }}{% endif %}
> 12 : {% if field.is_checkbox %}
> 13 : {{ field.field }}{{
field.label_tag }}
> 14 : {% else %}
> 15 : {{ field.label_tag }}
> 16 : {% if field.is_readonly %}
> 17 : <div class="readonly">{{
> field.contents }}</div>
>
>
> Traceback:
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\forms\forms.py" in
> __getitem__
> 163. field = self.fields[name]
>
> During handling of the above exception ('groups'), another
exception
> occurred:
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\core\handlers\exception.py"
> in inner
> 34. response = get_response(request)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\core\handlers\base.py"
> in _get_response
> 145. response =
> self.process_exception_by_middleware(e, request)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\core\handlers\base.py"
> in _get_response
> 143. response = response.render()
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\response.py"
> in render
> 106. self.content = self.rendered_content
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\response.py"
> in rendered_content
> 83. content = template.render(context, self._request)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\backends\django.py"
> in render
> 61. return self.template.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render
> 171. return self._render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in _render
> 163. return self.nodelist.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render
> 937. bit = node.render_annotated(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render_annotated
> 904. return self.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\loader_tags.py"
> in render
> 150. return compiled_parent._render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in _render
> 163. return self.nodelist.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render
> 937. bit = node.render_annotated(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render_annotated
> 904. return self.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\loader_tags.py"
> in render
> 150. return compiled_parent._render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in _render
> 163. return self.nodelist.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render
> 937. bit = node.render_annotated(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render_annotated
> 904. return self.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\loader_tags.py"
> in render
> 62. result = block.nodelist.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render
> 937. bit = node.render_annotated(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render_annotated
> 904. return self.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\loader_tags.py"
> in render
> 62. result = block.nodelist.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render
> 937. bit = node.render_annotated(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render_annotated
> 904. return self.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\defaulttags.py"
> in render
> 209. nodelist.append(node.render_annotated(context))
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render_annotated
> 904. return self.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\loader_tags.py"
> in render
> 188. return template.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render
> 173. return self._render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in _render
> 163. return self.nodelist.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render
> 937. bit = node.render_annotated(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render_annotated
> 904. return self.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\defaulttags.py"
> in render
> 209. nodelist.append(node.render_annotated(context))
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\base.py"
> in render_annotated
> 904. return self.render(context)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\template\defaulttags.py"
> in render
> 165. values = list(values)
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\contrib\admin\helpers.py"
> in __iter__
> 113. yield AdminField(self.form, field,
is_first=(i
> == 0))
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\contrib\admin\helpers.py"
> in __init__
> 125. self.field = form[field] # A
django.forms.BoundField
> instance
>
> File
>
"D:\Users\mike\envs\xxex3\lib\site-packages\django\forms\forms.py" in
> __getitem__
> 169. ', '.join(sorted(f for f in
self.fields)),
>
> Exception Type: KeyError at /admin/common/user/59/change/
> Exception Value: "Key 'groups' not found in 'UserForm'. Choices
are:
> email, first_name, is_active, is_staff, last_name, password,
username."
>
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