Implement query optimization

ram/consist/models.py

@@ -8,6 +8,7 @@ from django.core.exceptions import ValidationError
 
 from ram.models import BaseModel
 from ram.utils import DeduplicatedStorage
+from ram.managers import ConsistManager
 from metadata.models import Company, Scale, Tag
 from roster.models import RollingStock
 
@@ -35,6 +36,8 @@ class Consist(BaseModel):
         blank=True,
     )
 
+    objects = ConsistManager()
+
     def __str__(self):
         return "{0} {1}".format(self.company, self.identifier)