Implement lending system

lego/api/v1.py

@@ -75,6 +75,8 @@
 from lego.apps.users.views.registration import UserRegistrationRequestViewSet
 from lego.apps.users.views.user_delete import UserDeleteViewSet
 from lego.apps.users.views.users import UsersViewSet
+from lego.apps.lending.views import LendableObjectViewSet, LendingInstanceViewSet
+
 from lego.utils.views import SiteMetaViewSet
 
 router = routers.DefaultRouter()
@@ -141,6 +143,9 @@
     basename="abakusgroup-memberships",
 )
 router.register(r"joblistings", JoblistingViewSet, basename="joblisting")
+router.register(r"lendableobject", LendableObjectViewSet, basename="lendableobject")
+router.register(r"lendinginstance", LendingInstanceViewSet, basename="lendinginstance")
+
 router.register(
     r"meeting-token", MeetingInvitationTokenViewSet, basename="meeting-token"
 )

lego/apps/lending/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class LendingConfig(AppConfig):
+    name = "lego.apps.lending"
+    verbose_name = "Lending"

lego/apps/lending/filters.py

@@ -0,0 +1,20 @@
+from django_filters.rest_framework import FilterSet
+
+from lego.apps.lending.models import LendableObject, LendingInstance
+
+
+class LendableObjectFilterSet(FilterSet):
+    class Meta:
+        model = LendableObject
+        fields = ["title"]
+
+
+class LendingInstanceFilterSet(FilterSet):
+    class Meta:
+        model = LendingInstance
+        fields = [
+            "user",
+            "lendable_object",
+            "start_date",
+            "pending",
+        ]

lego/apps/lending/managers.py

@@ -0,0 +1,25 @@
+from lego.utils.managers import PersistentModelManager
+
+
+class LendingInstanceManager(PersistentModelManager):
+    def create(self, *args, **kwargs):
+        from lego.apps.users.models import Membership, User
+        from lego.apps.lending.notifications import LendingInstanceNotification
+
+        lending_instance = super().create(*args, **kwargs)
+        abakus_groups = lending_instance.lendable_object.responsible_groups.all()
+        role = lending_instance.lendable_object.responsible_role
+
+        users_to_be_notified = Membership.objects.filter(
+            abakus_group__in=abakus_groups, role=role
+        ).values_list("user", flat=True)
+
+        for user_id in users_to_be_notified:
+            user = User.objects.get(pk=user_id)
+            notification = LendingInstanceNotification(
+                lending_instance=lending_instance,
+                user_email=user,
+            )
+            notification.notify()
+
+        return lending_instance

lego/apps/lending/migrations/0001_initial.py

@@ -0,0 +1,60 @@
+# Generated by Django 4.0.10 on 2023-10-04 19:54
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('users', '0041_user_linkedin_id_alter_user_github_username'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='LendableObject',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(db_index=True, default=django.utils.timezone.now, editable=False)),
+                ('updated_at', models.DateTimeField(default=django.utils.timezone.now, editable=False)),
+                ('deleted', models.BooleanField(db_index=True, default=False, editable=False)),
+                ('title', models.CharField(max_length=128)),
+                ('description', models.TextField(blank=True)),
+                ('has_contract', models.BooleanField(default=False)),
+                ('max_lending_period', models.DurationField(null=True)),
+                ('responsible_role', models.CharField(choices=[('member', 'member'), ('leader', 'leader'), ('co-leader', 'co-leader'), ('treasurer', 'treasurer'), ('recruiting', 'recruiting'), ('development', 'development'), ('editor', 'editor'), ('retiree', 'retiree'), ('media_relations', 'media_relations'), ('active_retiree', 'active_retiree'), ('alumni', 'alumni'), ('webmaster', 'webmaster'), ('interest_group_admin', 'interest_group_admin'), ('alumni_admin', 'alumni_admin'), ('retiree_email', 'retiree_email'), ('company_admin', 'company_admin'), ('dugnad_admin', 'dugnad_admin'), ('trip_admin', 'trip_admin'), ('sponsor_admin', 'sponsor_admin'), ('social_admin', 'social_admin')], default='member', max_length=30)),
+                ('created_by', models.ForeignKey(default=None, editable=False, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='%(class)s_created', to=settings.AUTH_USER_MODEL)),
+                ('responsible_groups', models.ManyToManyField(to='users.abakusgroup')),
+                ('updated_by', models.ForeignKey(default=None, editable=False, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='%(class)s_updated', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'abstract': False,
+                'default_manager_name': 'objects',
+            },
+        ),
+        migrations.CreateModel(
+            name='LendingInstance',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(db_index=True, default=django.utils.timezone.now, editable=False)),
+                ('updated_at', models.DateTimeField(default=django.utils.timezone.now, editable=False)),
+                ('deleted', models.BooleanField(db_index=True, default=False, editable=False)),
+                ('start_date', models.DateTimeField(null=True)),
+                ('end_date', models.DateTimeField(null=True)),
+                ('pending', models.BooleanField(default=True)),
+                ('created_by', models.ForeignKey(default=None, editable=False, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='%(class)s_created', to=settings.AUTH_USER_MODEL)),
+                ('lendable_object', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='lending.lendableobject')),
+                ('updated_by', models.ForeignKey(default=None, editable=False, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='%(class)s_updated', to=settings.AUTH_USER_MODEL)),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'abstract': False,
+                'default_manager_name': 'objects',
+            },
+        ),
+    ]

lego/apps/lending/models.py

@@ -0,0 +1,42 @@
+from datetime import datetime, timedelta, timezone, tzinfo
+
+from django.db import models
+
+from lego.apps.users import constants
+from lego.apps.lending.managers import LendingInstanceManager
+
+
+from lego.utils.models import BasisModel
+
+
+# Create your models here.
+
+
+class LendableObject(BasisModel):
+    title = models.CharField(max_length=128, null=False, blank=False)
+    description = models.TextField(null=False, blank=True)
+    has_contract = models.BooleanField(default=False, null=False, blank=False)
+    max_lending_period = models.DurationField(null=True, blank=False)
+    responsible_groups = models.ManyToManyField("users.AbakusGroup")
+    responsible_role = models.CharField(
+        max_length=30, choices=constants.ROLES, default=constants.MEMBER
+    )
+    location = models.CharField(max_length=128, null=False, blank=False)
+
+    @property
+    def get_furthest_booking_date(self):
+        return timezone.now() + timedelta(days=14)
+
+
+class LendingInstance(BasisModel):
+    user = models.ForeignKey("users.User", on_delete=models.CASCADE)
+    lendable_object = models.ForeignKey(LendableObject, on_delete=models.CASCADE)
+    start_date = models.DateTimeField(null=True)
+    end_date = models.DateTimeField(null=True)
+    pending = models.BooleanField(default=True)
+
+    objects = LendingInstanceManager()  # type: ignore
+
+    @property
+    def active(self):
+        return timezone.now() < self.end_date and timezone.now() > self.start_date

lego/apps/lending/notifications.py

@@ -0,0 +1,40 @@
+from lego.apps.lending.models import LendingInstance
+from lego.apps.notifications.notification import Notification
+from lego.apps.users.models import User
+
+
+class LendingInstanceNotification(Notification):
+    def __init__(self, lending_instance: LendingInstance, user: User):
+        self.lending_instance = lending_instance
+        self.user = user
+
+        # TODO: Might not work
+        super().__init__(user=lending_instance.user)
+
+    name = "lending_instance_creation"
+
+    def generate_mail(self):
+        return self._delay_mail(
+            to_email=self.user.email_address,
+            context={
+                "user": self.user.full_name,
+                "lendable_object": self.lending_instance.lendable_object.title,
+                "start_date": self.lending_instance.start_date,
+                "end_date": self.lending_instance.end_date,
+            },
+            subject="Utlån forespørsel",
+            plain_template="users/email/lending_instance.txt",
+            html_template="users/email/lending_instance.html",
+        )
+
+    def generate_push(self):
+        return self._delay_push(
+            template="users/push/lending_instance.txt",
+            context={
+                "user": self.user.full_name,
+                "lendable_object": self.lending_instance.lendable_object.title,
+                "start_date": self.lending_instance.start_date,
+                "end_date": self.lending_instance.end_date,
+            },
+            instance=self.lending_instance,
+        )

lego/apps/lending/serializers.py

@@ -0,0 +1,37 @@
+from rest_framework import serializers
+
+
+from lego.apps.lending.models import LendableObject, LendingInstance
+
+
+class LendableObjectSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = LendableObject
+        fields = "__all__"
+
+
+class LendingInstanceSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = LendingInstance
+        fields = "__all__"
+
+    def validate(self, data):
+        lendable_object_id = data["lendable_object"].id
+        lendable_object = LendableObject.objects.get(id=lendable_object_id)
+        user = self.request.user
+
+        if not user.abakus_groups.filter(
+            id__in=lendable_object.responsible_groups.all().values_list("id", flat=True)
+        ).exists():
+            if (
+                data["end_date"] - data["start_date"]
+                > lendable_object.max_lending_period
+            ):
+                raise serializers.ValidationError(
+                    "Lending period exceeds maximum allowed duration"
+                )
+
+            # Add additional validation logic as per your use case
+            # ...
+
+        return data

lego/apps/lending/tests.py

@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.

lego/apps/lending/views.py

@@ -0,0 +1,60 @@
+from rest_framework import (
+    decorators,
+    exceptions,
+    mixins,
+    permissions,
+    renderers,
+    status,
+    viewsets,
+)
+from rest_framework.response import Response
+from rest_framework.viewsets import GenericViewSet
+
+from lego.apps.lending.filters import LendableObjectFilterSet, LendingInstanceFilterSet
+from lego.apps.lending.models import LendableObject, LendingInstance
+from lego.apps.lending.serializers import (
+    LendableObjectSerializer,
+    LendingInstanceSerializer,
+)
+from lego.apps.permissions.api.views import AllowedPermissionsMixin
+
+
+class LendableObjectViewSet(
+    AllowedPermissionsMixin,
+    mixins.CreateModelMixin,
+    mixins.DestroyModelMixin,
+    mixins.ListModelMixin,
+    GenericViewSet,
+):
+    queryset = LendableObject.objects.all()
+    serializer_class = LendableObjectSerializer
+    filterset_class = LendableObjectFilterSet
+    http_method_names = ["get", "post", "patch", "delete", "head", "options"]
+    permission_classes = [
+        permissions.IsAuthenticated,
+    ]
+
+
+class LendingInstanceViewSet(
+    AllowedPermissionsMixin,
+    mixins.CreateModelMixin,
+    mixins.DestroyModelMixin,
+    mixins.ListModelMixin,
+    GenericViewSet,
+):
+    queryset = LendingInstance.objects.all()
+    serializer_class = LendingInstanceSerializer
+    filterset_class = LendingInstanceFilterSet
+    http_method_names = ["get", "post", "patch", "delete", "head", "options"]
+    permission_classes = [
+        permissions.IsAuthenticated,
+    ]
+
+    def create(self, request):
+        serializer = LendingInstanceSerializer(request, data=request.data)
+
+        if serializer.is_valid(raise_exception=True):
+            serializer.save()
+            return Response(data=serializer.data, status=status.HTTP_201_CREATED)
+
+        return Response(data=serializer.errors, status=status.HTTP_400_BAD_REQUEST)

lego/apps/users/templates/users/email/lending_instance.html

@@ -0,0 +1,31 @@
+{% extends "email/base.html" %}
+
+{% block alert %}
+
+    <tr>
+        <td class="alert alert-warning">
+            Det er en ny forespørsel om å låne {{ lendable_object }}!
+        </td>
+    </tr>
+
+{% endblock %}
+
+{% block content %}
+
+    <tr>
+        <td class="content-block">
+            Bruker: {{ user }}!
+        </td>
+    </tr>
+
+
+
+    <tr>
+        <td class="content-block">
+            <i>Fra: {{ start_date }}, Til: {{ end_date }} </i>
+        </td>
+    </tr>
+
+
+
+{% endblock %}

lego/apps/users/templates/users/email/lending_instance.txt

@@ -0,0 +1,14 @@
+{% extends "email/base.txt" %}
+
+{% block content %}
+
+Det er en ny forespørsel om å låne {{ lendable_object }}!
+
+Bruker: {{ user }}!
+
+Fra: {{ start_date }}, Til: {{ end_date }}
+
+
+
+
+{% endblock %}

lego/apps/users/templates/users/push/lending_instance.txt

@@ -0,0 +1,5 @@
+Det er en ny forespørsel om å låne {{ lendable_object }}!
+
+Bruker: {{ user }}!
+
+Fra: {{ start_date }}, Til: {{ end_date }}

lego/settings/base.py

@@ -65,6 +65,7 @@
     "lego.apps.tags",
     "lego.apps.users",
     "lego.apps.websockets",
+    "lego.apps.lending",
 ]
 
 DEFAULT_AUTO_FIELD = "django.db.models.AutoField"