1 files changed, 17 insertions, 3 deletions
diff --git a/archaeological_context_records/models.py b/archaeological_context_records/models.py
index 89499463a..1378463a5 100644
--- a/archaeological_context_records/models.py
+++ b/archaeological_context_records/models.py
@@ -26,7 +26,7 @@ from django.utils.translation import ugettext_lazy as _, ugettext, pgettext
 
 from ishtar_common.models import GeneralType, BaseHistorizedItem, \
     HistoricalRecords, OwnPerms, ShortMenuItem, Source, GeneralRelationType,\
-    GeneralRecordRelations, post_delete_record_relation
+    GeneralRecordRelations, post_delete_record_relation, get_external_id
 from archaeological_operations.models import Operation, Period, Parcel
 
 
@@ -120,8 +120,9 @@ class ContextRecord(BaseHistorizedItem, OwnPerms, ShortMenuItem):
             'related_context_records': 'detailled_related_context_records'
         }
     }
-    external_id = models.CharField(_(u"External ID"), blank=True, null=True,
-                                   max_length=120)
+    external_id = models.TextField(_(u"External ID"), blank=True, null=True)
+    auto_external_id = models.BooleanField(
+        _(u"External ID is set automatically"), default=False)
     parcel = models.ForeignKey(Parcel, verbose_name=_(u"Parcel"),
                                related_name='context_record')
     operation = models.ForeignKey(Operation, verbose_name=_(u"Operation"),
@@ -298,6 +299,19 @@ class ContextRecord(BaseHistorizedItem, OwnPerms, ShortMenuItem):
         from archaeological_finds.models import FindSource
         return FindSource.objects.filter(find__base_finds__context_record=self)
 
+    def save(self, *args, **kwargs):
+        returned = super(ContextRecord, self).save(*args, **kwargs)
+        updated = False
+        if not self.external_id or self.auto_external_id:
+            external_id = get_external_id('context_record_external_id', self)
+            if external_id != self.external_id:
+                updated = True
+                self.auto_external_id = True
+                self.external_id = external_id
+        if updated:
+            self.save()
+        return returned
+
 
 class RelationType(GeneralRelationType):
     inverse_relation = models.ForeignKey(