Advanced search

Goal

The goal of my fork was to create an easy way to add filters in ModelAdmin, simply setting an attribute that I named ‘advanced_search_fields’. In the following, ‘advanced_search_fields’ refers to a filter that allows to filter the fields independently and is clearly implemented with a FilterSet form.

In my current implementation, the presence of attribute advanced_search_fields on ModelAdmin generates a button that will display the form filter when clicked. As in most other django ModelAdmin attributes there’s also a function named get_advanced_search_fields (same signature as get_search_fields) that you can use to customize the advanced_search field at runtime. This method takes precedence over the attribute.

Below you can find the features I added to django-filters:

short way to declare lookup_type

I realized that in many circumstancies I needed to create a FilterSet class just to set the lookup_type for each field, so I modified it in a way that accepts the lookup_type to be added to the field_name:

class CertificateAdmin(DjangoFiltersModelAdmin):
    model = Certificates
    advanced_search_fields = (
            ('start_date__gte', 'start_date__range', 'user'),
            ('status__in', 'description__icontains',),
            )

status__in

in case the field has choices, I fill the widget with them. In case the lookup_type is in a MultipleChoices Widget is used and a lookup type menu is used as well to select the operator.

The operators allow inclusion (.filter) or exclusion(.exclude) of selected items. In case of a ManyToManyField it also offers the choice between any or all selected items.

To customize this, you can set lookup_type attribute to Filter:

class MyTicketAdmin(TicketAdmin):
    advanced_search_fields = (
      ('typology__in',),
    )
def get_filterset_class(self, request):
    TkFilterset = super(MyTicketAdmin, self).get_filterset_class(request)
    class TkFilters(TkFilterset):
        def __init__(self, *args, **kw):
            super(TkFilters, self).__init__(*args, **kw)
            self.filters['typology__in'].lookup_type = ('not_in_any','not_in_all','in_any')
            return TkFilters

boolean

Boolean fields has a default that is ‘——’

date range

When the lookp type is range I use the DateRangeFilter. This definetely reflects a personal choice, but an example is provided to change this.

Implementation

My working implementation to get advance_search in admin pages is split in different places:

change_list.html:  

added 2 templatetags:

• one to add a button “advanced search” if needed
• one to add the form with advanced search input filters
• some javascript to serialize the form (just filled in fields)

ModelAdmin:

added/customized several methods:

• lookup_allowed: must let any field present in ‘advanced_search_fields’ to

  be used

• search_filterset_class: property that return a FilterSet based on the

  declared fields. To allow for greater flexibility, it’s possible to set it or to create get_filterset_class method instead.

• get_changelist: a personalized changelist is used (see below)

• queryset: if an advanced_search is requested, the new queryset produced

  by FilterSet (search_filterset.qs) is returned

ChangeList:

currently I customized the ‘get_filters’ method, to clean self.params from filters already used.

templatetags:

• jsearch_form: adds “Advanced Search” button
• advanced_search_form: renders the html form

advanced_search.js:  

• manages visibility of advanced_search form
• creates a serialization of just the filled in fields

Admin integration

Integrating this into the admin is quite simple. You just need to:

• declare django-filter early in INSTALLED_APPS. So doing change_list.html will be used instead of django.contrib.auth’s one

• declare in TEMPLATE_LOADER ‘django_filters.admin.Loader’ that implements the template syntax:

  admin:admin/change_list.html

  so that we don’t need to overwrite the whole template

• derive your ModelAdmin class from django_filters.admin.AdvancedSearchModelAdmin

• make your change_list extend django_filters:admin/change_list.html

• declare one of:

  • get_advanced_search_fields
  • advanced_search_fields
  • get_filterset_class

Customization

In the following lines I want to show how easy it can be to customize the filterset automatically build from the advanced_search_fields attribute.

autocomplete in advanced_search

Let’s add an autocomplettion to the form automatically generated. Let’s substitue:

advanced_search_fields = (
  ('organization__name__icontains',),
)

and let us add the widget from autocomplete_light:

class MyTicketAdmin(TicketAdmin):
    advanced_search_fields = (
      ('organization',),
    )
    def get_filterset_class(self, request):
        TkFilterset = super(MyTicketAdmin, self).get_filterset_class(request)
        class TkFilters(TkFilterset):
            def __init__(self, *args, **kw):
                super(TkFilters, self).__init__(*args, **kw)
                widget_with_autocompl = autocomplete_light.ChoiceWidget('OrganizationAutocomplete')
                self.form.fields['organization'].widget = widget_with_autocompl
                return TkFilters

Lookup Type Choices

• icontains -> contains
• istartswith -> starts with
• lt -> less then
• gt -> grater then
• lte -> less then or equal
• gte -> grater then or equal
• exact -> uguale a
• range -> range
• in_any -> in any
• in_all -> in all
• not_in_any -> not in any
• not_in_all -> not in all

Date customization

If you want a “less then or equal” and “grater then or equal” on a DateField, DateTimeField, or TimeField you can add lookup_type on the end of name of field in advanced_search_fields tuple this generate a 2 field separated:

class MyTicketAdmin(TicketAdmin):
    advanced_search_fields = (
      ('date_create__gt', 'date_create__lt',),
    )

But is possible get a single field with a customized lookup type menu:

class MyTicketAdmin(TicketAdmin):
    advanced_search_fields = (
      ('date_create',),
    )

    def get_filterset_class(self, request):
        TkFilterset = super(MyTicketAdmin, self).get_filterset_class(request)
        class TkFilters(TkFilterset):
            def __init__(self, *args, **kw):
                super(TkFilters, self).__init__(*args, **kw)
                self.filters['date_create'].lookup_type = ('gte','lte')
        return TkFilters

range that implements Tomorrow

Let’s implement a filter that offers option Tomorrow:

class RangeWithTomorrow(dj_filters.DateRangeFilter):
    options = dj_filters.DateRangeFilter.options.copy()
    options[0] = (_('Tomorrow'), lambda qs, name: qs.filter(**{
            '%s__year' % name: now().year,
            '%s__month' % name: now().month,
            '%s__day' % name: now().day +1,
        }))

And now let’s add it to the filterset:

class MyPlanAdmin(PlanAdmin):
    actions = [create_agenda]
    def get_filterset_class(self, request):
        PlanFilterset = super(MyPlanAdmin, self).get_filterset_class(request)
        class MyPlanFilters(PlanFilterset):
            date_begin__range = RangeWithTomorrow(name='date_begin', lookup_type='range', label='Start')
        return MyPlanFilters

Autocompletion in forms

You can also add an autocompletion, just changing the widget in the form:

def get_filterset_class(self, request):
   TkFilterset = super(MyTicketAdmin, self).get_filterset_class(request)
   class MyTkFilters(TkFilterset):
       def __init__(self, *args, **kw):
          super(MyTkFilters, self).__init__(*args, **kw)
          widget_with_autocompl = autocomplete_light.ChoiceWidget('amministratore')
          self.form.fields['project__organization__azienda__amministratore'].widget = widget_with_autocompl