chore(sample_project): implement relations in models.py & add migrations

sample_project/migrations/0002_iscousinof_ispartof_issiblingof_livesin.py

@@ -0,0 +1,82 @@
+# Generated by Django 5.0.6 on 2024-08-27 08:39
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("relations", "0001_initial"),
+        ("sample_project", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="IsCousinOf",
+            fields=[
+                (
+                    "relation_ptr",
+                    models.OneToOneField(
+                        auto_created=True,
+                        on_delete=django.db.models.deletion.CASCADE,
+                        parent_link=True,
+                        primary_key=True,
+                        serialize=False,
+                        to="relations.relation",
+                    ),
+                ),
+            ],
+            bases=("relations.relation",),
+        ),
+        migrations.CreateModel(
+            name="IsPartOf",
+            fields=[
+                (
+                    "relation_ptr",
+                    models.OneToOneField(
+                        auto_created=True,
+                        on_delete=django.db.models.deletion.CASCADE,
+                        parent_link=True,
+                        primary_key=True,
+                        serialize=False,
+                        to="relations.relation",
+                    ),
+                ),
+            ],
+            bases=("relations.relation",),
+        ),
+        migrations.CreateModel(
+            name="IsSiblingOf",
+            fields=[
+                (
+                    "relation_ptr",
+                    models.OneToOneField(
+                        auto_created=True,
+                        on_delete=django.db.models.deletion.CASCADE,
+                        parent_link=True,
+                        primary_key=True,
+                        serialize=False,
+                        to="relations.relation",
+                    ),
+                ),
+            ],
+            bases=("relations.relation",),
+        ),
+        migrations.CreateModel(
+            name="LivesIn",
+            fields=[
+                (
+                    "relation_ptr",
+                    models.OneToOneField(
+                        auto_created=True,
+                        on_delete=django.db.models.deletion.CASCADE,
+                        parent_link=True,
+                        primary_key=True,
+                        serialize=False,
+                        to="relations.relation",
+                    ),
+                ),
+            ],
+            bases=("relations.relation",),
+        ),
+    ]

sample_project/models.py

@@ -4,6 +4,7 @@
 from apis_core.apis_entities.models import AbstractEntity
 from apis_core.generic.abc import GenericModel
 from apis_core.history.models import VersionMixin
+from apis_core.relations.models import Relation
 
 
 class Profession(GenericModel, models.Model):
@@ -20,3 +21,39 @@ class Place(VersionMixin, E53_Place, AbstractEntity):
 
 class Group(VersionMixin, E74_Group, AbstractEntity):
     pass
+
+
+class IsCousinOf(Relation):
+    subj_model = Person
+    obj_model = Person
+
+    @classmethod
+    def reverse_name(self) -> str:
+        return "is cousin of"
+
+
+class IsPartOf(Relation):
+    subj_model = Person
+    obj_model = Group
+
+    @classmethod
+    def reverse_name(self) -> str:
+        return "consists of"
+
+
+class IsSiblingOf(Relation):
+    subj_model = Person
+    obj_model = Person
+
+    @classmethod
+    def reverse_name(self) -> str:
+        return "is sibling of"
+
+
+class LivesIn(Relation):
+    subj_model = Person
+    obj_model = Place
+
+    @classmethod
+    def reverse_name(self) -> str:
+        return "has inhabitant"