Переделал модель Parameter и связь с ObjItem

dbapp/mainapp/models.py

@@ -243,11 +243,11 @@ class ObjItemQuerySet(models.QuerySet):
             "updated_by__user",
             "created_by__user",
             "source_type_obj",
-        ).prefetch_related(
-            "parameters_obj__id_satellite",
-            "parameters_obj__polarization",
-            "parameters_obj__modulation",
-            "parameters_obj__standard",
+            "parameter_obj",
+            "parameter_obj__id_satellite",
+            "parameter_obj__polarization",
+            "parameter_obj__modulation",
+            "parameter_obj__standard",
         )
 
     def recent(self, days=30):
@@ -449,8 +449,14 @@ class Parameter(models.Model):
         verbose_name="Стандарт",
     )
     # id_user_add = models.ForeignKey(CustomUser, on_delete=models.SET_NULL, related_name="parameter_added", verbose_name="Пользователь", null=True, blank=True)
-    objitems = models.ManyToManyField(
-        ObjItem, related_name="parameters_obj", verbose_name="Источники", blank=True
+    objitem = models.OneToOneField(
+        ObjItem,
+        on_delete=models.CASCADE,
+        related_name="parameter_obj",
+        verbose_name="Объект",
+        null=True,
+        blank=True,
+        help_text="Связанный объект"
     )
     # id_sigma_parameter = models.ManyToManyField(SigmaParameter, on_delete=models.SET_NULL, related_name="sigma_parameter", verbose_name="ВЧ с sigma", null=True, blank=True)
     # id_sigma_parameter = models.ManyToManyField(SigmaParameter, verbose_name="ВЧ с sigma", null=True, blank=True)