1 files changed, 28 insertions, 2 deletions
diff --git a/archaeological_operations/models.py b/archaeological_operations/models.py
index ae86a42ef..977fbdb4a 100644
--- a/archaeological_operations/models.py
+++ b/archaeological_operations/models.py
@@ -24,7 +24,7 @@ from django.conf import settings
 from django.contrib.gis.db import models
 from django.core.urlresolvers import reverse
 from django.db.models import Q, Count, Sum, Max, Avg
-from django.db.models.signals import post_save, m2m_changed
+from django.db.models.signals import post_save, m2m_changed, post_delete
 from django.forms import ValidationError
 from django.utils.translation import ugettext_lazy as _, ugettext
 
@@ -33,7 +33,8 @@ from ishtar_common.utils import cached_label_changed
 from ishtar_common.models import GeneralType, BaseHistorizedItem, \
     HistoricalRecords, LightHistorizedItem, OwnPerms, Department, Source,\
     Person, Organization, Town, Dashboard, IshtarUser, ValueGetter, \
-    DocumentTemplate, ShortMenuItem, DashboardFormItem
+    DocumentTemplate, ShortMenuItem, DashboardFormItem, GeneralRelationType,\
+    GeneralRecordRelations, post_delete_record_relation
 FILES_AVAILABLE = 'archaeological_files' in settings.INSTALLED_APPS
 
 
@@ -473,6 +474,31 @@ def operation_post_save(sender, **kwargs):
 post_save.connect(operation_post_save, sender=Operation)
 
 
+class RelationType(GeneralRelationType):
+    inverse_relation = models.ForeignKey(
+        'RelationType', verbose_name=_(u"Inverse relation"), blank=True,
+        null=True)
+
+    class Meta:
+        verbose_name = _(u"Operation relation type")
+        verbose_name_plural = _(u"Operation relation types")
+        ordering = ('order',)
+
+
+class RecordRelations(GeneralRecordRelations, models.Model):
+    left_record = models.ForeignKey(Operation,
+                                    related_name='right_relations')
+    right_record = models.ForeignKey(Operation,
+                                     related_name='left_relations')
+    relation_type = models.ForeignKey(RelationType)
+
+    class Meta:
+        verbose_name = _(u"Operation record relation")
+        verbose_name_plural = _(u"Operation record relations")
+
+post_delete.connect(post_delete_record_relation, sender=RecordRelations)
+
+
 class OperationByDepartment(models.Model):
     '''
     Database view for dashboard