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

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.

>
> On Tue 27 Nov, 2018 8:54 am Mike Dewhirst <miked@dewhirst.com.au
> <mailto:miked@dewhirst.com.au> wrote:
>
> 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
>
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