created the required models, views, urls and added to admin

links/admin.py

@@ -1,3 +1,16 @@
 from django.contrib import admin
 
-# Register your models here.
+from .models import Category, Link
+
+
+@admin.register(Category)
+class CategoryAdmin(admin.ModelAdmin):
+    list_display = ["title", "slug", "parent"]
+    prepopulated_fields = {"slug": ("title",)}
+
+
+@admin.register(Link)
+class LinkAdmin(admin.ModelAdmin):
+    list_display = ["title", "website", "category", "is_published", "followed"]
+    list_filter = ["category", "is_published"]
+    ordering = ["title"]

links/models.py

@@ -1,3 +1,46 @@
 from django.db import models
+from django.urls import reverse_lazy
+from django.utils.text import slugify
 
-# Create your models here.
+
+class Category(models.Model):
+    title = models.CharField(max_length=40, unique=True)
+    slug = models.SlugField(max_length=40, unique=True)
+    introduction = models.TextField(blank=True, null=True)
+    parent = models.ForeignKey(
+        "self", blank=True, null=True, on_delete=models.CASCADE, related_name="children"
+    )
+
+    def save(
+        self, force_insert=False, force_update=False, using=None, update_fields=None
+    ):
+        if not self.slug:
+            self.slug = slugify(self.title)
+        return super(Category, self).save()
+
+    def get_absolute_url(self):
+        return reverse_lazy("links:list_category", args=["self.slug"])
+
+    def __str__(self):
+        return self.title
+
+    class Meta:
+        ordering = ["title"]
+
+
+class Link(models.Model):
+    title = models.CharField(max_length=200, unique=True)
+    website = models.URLField(unique=True)
+    introduction = models.TextField(blank=True, null=True)
+    category = models.ForeignKey(
+        Category, on_delete=models.PROTECT, related_name="links"
+    )
+    followed = models.PositiveIntegerField(default=0)
+    created = models.DateTimeField(auto_now_add=True)
+    is_published = models.BooleanField(default=False)
+
+    def __str__(self):
+        return self.title
+
+    class Meta:
+        ordering = ["category", "title"]

links/urls.py

@@ -0,0 +1,11 @@
+from django.urls import path
+
+from . import views
+
+app_name = "links"
+
+urlpatterns = [
+    path("", views.LinkList.as_view(), name="list"),
+    path("categories/<slug:category>/", views.LinkList.as_view(), name="list_category"),
+    path("launch/<str:title>", views.LinkRedirectView.as_view(), name="open_link"),
+]

links/views.py

@@ -1,3 +1,33 @@
-from django.shortcuts import render
+from django.db.models import Prefetch
+from django.shortcuts import get_object_or_404
+from django.views.generic import ListView, RedirectView
 
-# Create your views here.
+from .models import Category, Link
+
+
+class CategoryList(ListView):
+    model = Category
+
+
+class LinkList(ListView):
+    template_name = "links/link_list.html"
+    paginate_by = 6
+
+    def get_queryset(self):
+        category_group = self.kwargs.get("category", None)
+        if category_group:
+            queryset = Category.objects.filter(slug=category_group)
+        else:
+            queryset = Category.objects.filter(parent=None)
+        return queryset.prefetch_related(
+            Prefetch("links", queryset=Link.objects.filter(is_published=True))
+        )
+
+
+class LinkRedirectView(RedirectView):
+
+    def get_redirect_url(self, *args, **kwargs):
+        url = get_object_or_404(Link, title=kwargs["title"])
+        url.followed += 1
+        url.save()
+        return url.website