Natural keys for operations, context records, finds, etc.

1 files changed, 5 insertions, 1 deletions

diff --git a/archaeological_context_records/models.py b/archaeological_context_records/models.py
index 080fa54da..58acfd148 100644
--- a/archaeological_context_records/models.py
+++ b/archaeological_context_records/models.py
@@ -35,7 +35,7 @@ from ishtar_common.models import Document, GeneralType, \
     BaseHistorizedItem, HistoricalRecords, OwnPerms, ShortMenuItem, \
     GeneralRelationType, GeneralRecordRelations, post_delete_record_relation,\
     post_save_cache, ValueGetter, BulkUpdatedItem, \
-    RelationItem, Town, get_current_profile
+    RelationItem, Town, get_current_profile, ExternalIdManager
 from archaeological_operations.models import Operation, Period, Parcel, \
     ArchaeologicalSite
 
@@ -396,6 +396,7 @@ class ContextRecord(BulkUpdatedItem, BaseHistorizedItem,
         blank=True)
     cached_label = models.TextField(_(u"Cached name"), null=True, blank=True,
                                     db_index=True)
+    objects = ExternalIdManager()
 
     class Meta:
         verbose_name = _(u"Context Record")
@@ -409,6 +410,9 @@ class ContextRecord(BulkUpdatedItem, BaseHistorizedItem,
         )
         ordering = ('cached_label',)
 
+    def natural_key(self):
+        return (self.external_id, )
+
     @property
     def name(self):
         return self.label or ""