From 768881356ebe8ec01a6c087a7c1298d18aaafb26 Mon Sep 17 00:00:00 2001
From: Birger Schacht <birger.schacht@oeaw.ac.at>
Date: Mon, 29 Jan 2024 15:58:28 +0100
Subject: [PATCH] feat(apis_entities): implement default abstract entity
 classes

Closes: #403
---
 apis_core/apis_entities/abc.py | 35 ++++++++++++++++++++++++++++++++++
 apis_core/core/abc.py          |  8 ++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 apis_core/apis_entities/abc.py
 create mode 100644 apis_core/core/abc.py

diff --git a/apis_core/apis_entities/abc.py b/apis_core/apis_entities/abc.py
new file mode 100644
index 000000000..aa2dd33b7
--- /dev/null
+++ b/apis_core/apis_entities/abc.py
@@ -0,0 +1,35 @@
+from django.db import models
+from apis_core.core.abc import LabelBaseModel
+
+#########################
+# Abstract base classes #
+#########################
+
+
+# These abstract base classes are named after
+# CIDOC CRM entities, but we are *NOT*(!)
+# trying to implement CIDOC CRM in Django.
+
+
+class E21_Person(LabelBaseModel, models.Model):
+    forename = models.CharField(blank=True, default="")
+    surname = models.CharField(blank=True, default="")
+    gender = models.CharField(blank=True, default="")
+    date_of_birth = models.DateField(blank=True, null=True)
+    date_of_death = models.DateField(blank=True, null=True)
+
+    class Meta:
+        abstract = True
+
+
+class E53_Place(LabelBaseModel, models.Model):
+    longitude = models.FloatField(blank=True, null=True)
+    latitude = models.FloatField(blank=True, null=True)
+
+    class Meta:
+        abstract = True
+
+
+class E74_Group(LabelBaseModel, models.Model):
+    class Meta:
+        abstract = True
diff --git a/apis_core/core/abc.py b/apis_core/core/abc.py
new file mode 100644
index 000000000..abc03683c
--- /dev/null
+++ b/apis_core/core/abc.py
@@ -0,0 +1,8 @@
+from django.db import models
+
+
+class LabelBaseModel(models.Model):
+    label = models.CharField(blank=True, default="")
+
+    class Meta:
+        abstract = True