[Django Admin Features] # django #admin

Custom_Actions.py

# How add action to admin
class PurchaseAdmin(admin.ModelAdmin):
    actions = [ship]


def ship(modeladmin, request, queryset):
    queryset.update(
        shipped=True,
        shipped_at=timezone.now()
    )
ship.short_description = 'Mark purchases as shipped now'

Custom_Filters.py

class BigOrderFilter(admin.SimpleListFilter):
    title = 'big order'
    parameter_name = 'big_order'
	
    # What wiil be in dropdown
    def lookups(self, request, model_admin):
        return (
            ('1', 'True'),
            ('0', 'False'),
        )
    
	# Modify qs what will be applied to filter
    def queryset(self, request, queryset):
        if self.value() == '1':
            return queryset.annotate(Count('items')).filter(items__count__gte=2)
        return queryset

Fields.py

class CustomerAdmin(admin.ModelAdmin):
    form = forms.CustomerForm
    list_display = ['admin_name']
    save_as = True
    save_on_top = True
    search_fields = ['name']
    date_hierarchy = 'placed_at'
    inlines = [PurchaseItemInline]
    list_editable = ['shipped']
    list_filter = ['shipped', 'placed_at', 'shipped_at', BigOrderFilter]
    ordering = ['placed_at']
    search_fields = ['customer__name', 'items__name']
    formfield_overrides = {
        dj_models.TextField: {'widget': widgets.WYSIWYGTextarea}
    }
    inlines = [ImageInline]
    prepopulated_fields = {'slug': ('name',)}
    radio_fields = {'featured': admin.HORIZONTAL}

    fieldsets = (
        (None, {
            'fields': (
                ('customer', 'total', 'shipped'),
                'discount_code'
            )
        }),
        ('Dates', {
            'classes': ('collapse',),
            'fields': ('placed_at', 'shipped_at'),
        })
    )

methods.py

def queryset(self, request):
	qs = super(ProductAdmin, self).queryset(request)
    qs = qs.prefetch_related("product_item")
    return qs
-------------------------------------------------------
def product_item_count(self, obj):
  return obj.product_item_count
    
  def queryset(self, request):
      qs = super(ProductAdmin, self).queryset(request)
      return qs.annotate(product_item_count=Count('product_item'))