make a simple event management/registration system

src/haps/admin.py

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+from django.contrib import admin
+from .models import EventRegistration, Event
+
+
+@admin.register(Event)
+class EventAdmin(admin.ModelAdmin):
+    search_fields = ["name"]
+    list_display = [
+        "name",
+        "venue",
+        "start_time",
+        "accept_reg",
+        "show_on_home",
+        "event_page",
+    ]
+    list_filter = ["show_on_home", "accept_reg"]
+    fields = [
+        "name",
+        "description",
+        "cover_image",
+        "venue",
+        "start_time",
+        "end_time",
+        "accept_reg",
+        "show_on_home",
+    ]
+
+
+@admin.register(EventRegistration)
+class EventRegistrationAdmin(admin.ModelAdmin):
+    search_fields = ["event", "user"]
+    list_display = ["user", "event"]
+    list_filter = ["event__name"]

src/haps/apps.py

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+from django.apps import AppConfig
+
+
+class HapsConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "haps"

src/haps/migrations/0001_initial.py

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+# Generated by Django 4.2.1 on 2023-12-23 19:40
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+import utils.images
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Event",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("name", models.CharField(max_length=256)),
+                ("slug", models.SlugField(unique=True)),
+                ("description", models.TextField(max_length=4096)),
+                (
+                    "cover_image",
+                    models.ImageField(
+                        blank=True, null=True, upload_to=utils.images.upload_image_to
+                    ),
+                ),
+                ("venue", models.CharField(max_length=128)),
+                ("start_time", models.DateField()),
+                ("end_time", models.DateField(blank=True, null=True)),
+                (
+                    "accept_reg",
+                    models.BooleanField(verbose_name="Accepting registrations ?"),
+                ),
+                (
+                    "show_on_home",
+                    models.BooleanField(verbose_name="Show on Home Page ?"),
+                ),
+            ],
+        ),
+        migrations.CreateModel(
+            name="EventRegistration",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "event",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE, to="haps.event"
+                    ),
+                ),
+                (
+                    "user",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+            ],
+        ),
+    ]

src/haps/models.py

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+from django.db import models
+from django.contrib.auth import get_user_model
+from django.utils.html import format_html
+from utils.images import upload_image_to
+from utils.slugs import generate_unique_slug
+
+User = get_user_model()
+
+
+class Event(models.Model):
+    name = models.CharField(max_length=256)
+    slug = models.SlugField(unique=True, blank=True)
+    description = models.TextField(max_length=4096)
+    cover_image = models.ImageField(upload_to=upload_image_to, blank=True, null=True)
+    venue = models.CharField(max_length=128)
+    start_time = models.DateField()
+    end_time = models.DateField(null=True, blank=True)
+    accept_reg = models.BooleanField(verbose_name="Accepting registrations ?")
+    show_on_home = models.BooleanField(verbose_name="Show on Home Page ?")
+
+    def __str__(self):
+        return self.name + str(self.start_time)
+
+    def save(self, *args, **kwargs):
+        if self.slug == "":
+            self.slug = generate_unique_slug(self.name, Event)
+        super().save(args, kwargs)
+
+    def get_absolute_url(self):
+        return f"/events/e/{self.slug}"
+
+    def event_page(self):
+        return format_html(f'<a href="{self.get_absolute_url()}" target="_blank">View Page</a>')
+
+
+class EventRegistration(models.Model):
+    event = models.ForeignKey(Event, on_delete=models.CASCADE)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
+
+    def __str__(self) -> str:
+        return self.user.__str__() + "%" + self.event.__str__()

src/haps/templates/haps/list.html

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+{% extends "commons.html" %}
+{% block title %} Events {% endblock title %}
+{%block content %}
+
+
+<div class="flex justify-center flex-wrap">
+
+{%for hap in haps %}
+
+<div
+  class="max-w-sm bg-white border border-gray-200 rounded-lg shadow dark:bg-gray-800 dark:border-gray-700 mb-4 mt-4 ml-4 mr-4"
+>
+  <a href="#">
+    <img class="rounded-t-lg" src="{{hap.cover_image.url}}" alt="" />
+  </a>
+  <div class="p-5">
+    <a href="#">
+      <h5
+        class="mb-2 text-2xl font-bold tracking-tight text-gray-900 dark:text-white"
+      >
+        {{hap.name}}
+      </h5>
+    </a>
+    <p class="mb-3 font-normal text-gray-700 dark:text-gray-400">
+     {{hap.description}}
+    </p>
+
+
+    <p> <i class="fa-solid fa-location-dot"></i> {{hap.venue}}
+
+    </p>
+    <p> <i class="fa-solid fa-calendar"></i> {{hap.start_time}}</p>
+    <a
+      href="{{hap.get_absolute_url}}"
+      class="inline-flex items-center px-3 py-2 text-sm font-medium text-center text-white bg-primary-700 rounded-lg hover:bg-primary-800 focus:ring-4 focus:outline-none focus:ring-primary-300 dark:bg-primary-600 dark:hover:bg-primary-700 dark:focus:ring-primary-800 mt-4"
+    >
+      Read more
+      <svg
+        class="rtl:rotate-180 w-3.5 h-3.5 ms-2"
+        aria-hidden="true"
+        xmlns="http://www.w3.org/2000/svg"
+        fill="none"
+        viewBox="0 0 14 10"
+      >
+        <path
+          stroke="currentColor"
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M1 5h12m0 0L9 1m4 4L9 9"
+        />
+      </svg>
+    </a>
+  </div>
+</div>
+
+
+{% endfor %}
+
+
+
+</div>
+{% endblock %}

src/haps/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

src/haps/urls.py

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+from django.urls import path
+
+from . import views
+
+app_name = "haps"
+
+urlpatterns = [
+    path("", views.haps_list, name="events"),
+    path("e/<slug>", views.haps_item, name="event_item"),
+]

src/haps/views.py

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+from django.shortcuts import render
+from django.http import HttpRequest, Http404
+from .models import Event
+import logging
+
+log = logging.getLogger(__name__)
+
+
+def haps_list(request: HttpRequest):
+    haps = Event.objects.all()
+    context = {"haps": haps}
+    return render(request, "haps/list.html", context=context)
+
+
+def haps_item(request: HttpRequest, slug: str):
+    event = Event.objects.get(slug=slug)
+    context = {"event": event}
+
+    return render(request, "haps/item.html", context=context)