How to get a multiple select widget for the Admin without a queryset

[Mike Dewhirst]

In the Admin I would like to provide the user with checkboxes against a list of options not stored in the database.

Specifically, I want to retrieve a comma separated list of integers from a model field choices attribute. The model field looks like this:

    menu_links = models.CharField(max_length=LARGE, blank=True,
        choices=MENU_LINKS,
        default='',
        validators=[int_list_validator],
        verbose_name='Menu data links',
        help_text="These selections control which URLs are displayed in the "
        "'Substances and mixtures' menu",
    )

I'm seeing two problems.

One is getting such a widget to appear in an admin.StackedInline class.

Two is creating the data in the above models.CharField from choices=MENU_LINKS

Here it is ...

MENU_LINKS = [
    (1, "ChemIDplus"),
    (2, "ChemSpider"),
    (3, "NIST Webbook"),
]

In the admin I have tried

class ProfileFilteredSelectMultiple(admin.widgets.FilteredSelectMultiple):

    def __init__(self, verbose_name='Menu links', is_stacked=False, *args, **kwargs):
        args += (verbose_name,)
        args += (is_stacked,)
        super(ProfileFilteredSelectMultiple, self).__init__(*args, **kwargs)

Then in the nested StackedInline class ...

    class CompanyProfileInline(admin.StackedInline):

        model = CompanyProfile
        formfield_overrides = {
            CharField: {'widget': ProfileFilteredSelectMultiple},
        }
        readonly_fields = (('modified', 'modified_by',))
        fieldsets = (
            ('More detail for company profile', {
                'classes': ('collapse', 'wider'),
                'fields': (
                     'menu_links',
                     ...

Any hints or pointers will be appreciated.

Thanks

Mike

[shiva kumar]

Can you explain what ur problem briefly.

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[Mike Dewhirst]

On 27/11/2018 3:57 PM, shiva kumar wrote:
> Can you explain what ur problem briefly.

In the Admin I show a list of substance names and against each one there
can be a list of clickable links to public chemical databases. When the
user clicks one of those links the database opens in a new browser page
with that substance showing. The user may then browse that public
database for info on that substance.

Currently we have hard-coded three of 14 or 15 different public chemical
databases. Different users have different preferences so I want to allow
them to select their preferred one or two in their company profile and
tweak the Admin to check the profile and display those instead of the
hard-coded three.

Since sending that earlier email I have adjust the field type to
ListField (import CharField as ListField) so that I know there is only
one field in the entire project which is a ListField. This is for CSS
and formfield_overrides.

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