Import Timbres Admin Class

Clientes/admin.py

@@ -1,18 +1,53 @@
 from django.contrib import admin
 from .models import Timbres, saldoModel, Clientes,ErroresTimbres
+from import_export import resources,fields
+from import_export.admin import ImportMixin
+from datetime import datetime
+
+from import_export import resources, fields
+from datetime import datetime
+from django.core.exceptions import ValidationError
+
+class TimbresCSV(resources.ModelResource):
+    created_at = fields.Field(column_name='created_at', attribute='created_at')
+
+    class Meta:
+        model = Timbres
+        fields = ['uuid', 'rfcc', 'rfcp', 'fecha', 'folio', 'serie', 'tipo', 'created_at', 'modo']
+        import_id_fields = ('uuid',)
+        use_bulk = True
+        
+    def clean_created_at(self, value):
+        try:
+            # Convertir el valor de 'created_at' a un objeto datetime
+            return datetime.strptime(value, '%Y-%m-%d %H:%M:%S')
+        except ValueError:
+            raise ValidationError("Formato de fecha incorrecto")
+    def save_instance(self, instance, is_create, using_transactions=True, dry_run=False):
+        created_at = instance.created_at
+        # super().after_save_instance(instance, using_transactions, dry_run)
+        # self.before_save_instance(instance, using_transactions, dry_run)        
+        if is_create:            
+            instance.save()
+            instance.created_at =created_at
+            instance.save()
+        
 
 
-class TimbresAdmin(admin.ModelAdmin):
-    list_display=['uuid','rfcc','rfcp','fecha','folio','serie','tipo','modo','created_at']
+@admin.register(Timbres)
+class TimbresAdmin(ImportMixin, admin.ModelAdmin):
+    list_display=['uuid', 'rfcc', 'rfcp', 'fecha', 'folio', 'serie', 'tipo', 'modo', 'created_at']
+    resource_class = TimbresCSV
     list_filter=['modo','tipo']
-    search_fields =('uuid',)
+    search_fields = ('uuid',)
+
 
 
 class ClientesAdmin(admin.ModelAdmin):
     list_display= ['RFC','Nombre','Activo','fecha_baja']
     list_filter =['RFC','Activo']
 
-admin.site.register(Timbres,TimbresAdmin)
+#admin.site.register(Timbres,TimbresAdmin)
 admin.site.register(saldoModel)
 admin.site.register(Clientes,ClientesAdmin)
 admin.site.register(ErroresTimbres)

Clientes/models.py

@@ -21,6 +21,7 @@ class Timbres(models.Model):
     modo = models.CharField(max_length=10,blank=True, null =True)
     class Meta:
         ordering = ('-created_at',)
+    
 
 
 class ErroresTimbres(models.Model):