feat: add biding model and improve listing model

auctions/admin.py

@@ -1,6 +1,7 @@
 from django.contrib import admin
 
-from .models import User, Listing
+from .models import User, Listing, Biding
 
 admin.site.register(User)
 admin.site.register(Listing)
+admin.site.register(Biding)

auctions/migrations/0002_biding.py

@@ -0,0 +1,24 @@
+# Generated by Django 4.1.5 on 2023-01-31 19:29
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('auctions', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Biding',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('value', models.FloatField()),
+                ('buyer', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='bidings', to=settings.AUTH_USER_MODEL)),
+                ('item', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='bidings', to='auctions.listing')),
+            ],
+        ),
+    ]

auctions/migrations/0003_listing_photo_alter_biding_value.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.1.5 on 2023-01-31 19:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('auctions', '0002_biding'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='listing',
+            name='photo',
+            field=models.ImageField(blank=True, upload_to='photos/'),
+        ),
+        migrations.AlterField(
+            model_name='biding',
+            name='value',
+            field=models.DecimalField(decimal_places=2, max_digits=6),
+        ),
+    ]

auctions/migrations/0004_rename_name_listing_title_remove_listing_photo_and_more.py

@@ -0,0 +1,37 @@
+# Generated by Django 4.1.5 on 2023-01-31 19:56
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('auctions', '0003_listing_photo_alter_biding_value'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='listing',
+            old_name='name',
+            new_name='title',
+        ),
+        migrations.RemoveField(
+            model_name='listing',
+            name='photo',
+        ),
+        migrations.AddField(
+            model_name='listing',
+            name='category',
+            field=models.CharField(blank=True, choices=[('Fashion', 'Fashion'), ('Home', 'Home'), ('Electronics', 'Electronics'), ('Toys', 'Toys'), ('Other', 'Other')], max_length=24),
+        ),
+        migrations.AddField(
+            model_name='listing',
+            name='initial_bid',
+            field=models.DecimalField(decimal_places=2, default=0.0, max_digits=6),
+        ),
+        migrations.AddField(
+            model_name='listing',
+            name='photo_url',
+            field=models.URLField(blank=True),
+        ),
+    ]

auctions/models.py

@@ -7,9 +7,30 @@ class User(AbstractUser):
 
 
 class Listing(models.Model):
-    name = models.CharField(max_length=64)
+    title = models.CharField(max_length=64)
     description = models.CharField(max_length=256)
+    initial_bid = models.DecimalField(max_digits=6, decimal_places=2, default=0.00)
+    photo_url = models.URLField(blank=True)
+
+    CATEGORIES_CHOICES = [
+        ('Fashion', 'Fashion'),
+        ('Home', 'Home'),
+        ('Electronics', 'Electronics'),
+        ('Toys', 'Toys'),
+        ('Other', 'Other'),
+    ]
+    category = models.CharField(choices=CATEGORIES_CHOICES, max_length=24, blank=True)
+
     seller = models.ForeignKey(User, on_delete=models.CASCADE, related_name="listings")
 
     def __str__(self):
-        return f"{self.name}, {self.description}"
+        return f"{self.title}: {self.description}"
+
+
+class Biding(models.Model):
+    value = models.DecimalField(max_digits=6, decimal_places=2)
+    buyer = models.ForeignKey(User, on_delete=models.CASCADE, related_name="bidings")
+    item = models.ForeignKey(Listing, on_delete=models.CASCADE, related_name="bidings")
+
+    def __str__(self):
+        return f"{self.buyer} bids ${self.value} in {self.item.title}"

auctions/templates/auctions/index.html

@@ -5,7 +5,11 @@ <h2>Active Listings</h2>
 
      <ul>
         {% for listing in listings %}
-            <li>Listing {{ listing.id }}: {{ listing.name }} - {{ listing.description }}, made by {{ listing.seller }}</li>
+            <li>
+                <img src="{{ listing.photo_url }}" width="128">
+                <a href="{% url 'listing' listing.id %}">{{ listing.title }}:</a>
+                {{ listing.description }}, by {{ listing.seller }}
+            </li>
         {% endfor %}
     </ul>
 {% endblock %}

auctions/templates/auctions/listing.html

@@ -0,0 +1,24 @@
+{% extends "auctions/layout.html" %}
+
+{% block body %}
+    <h2>{{ listing.title }}</h2>
+    <img src="{{ listing.photo_url }}" width="256">
+    <ul>
+        <li>Description: {{ listing.description }}</li>
+        <li>Seller: {{ listing.seller }}</li>
+        {% if listing.category %}
+            <li>Category: {{ listing.category }}</li>
+        {% endif %}
+    </ul>
+
+    <h2>Bidings</h2>
+    <ul>
+        {% for bid in bidings %}
+            <li>{{ bid }}</li>
+        {% empty %}
+            <li>Minimal bid: {{ listing.initial_bid }}</li>
+        {% endfor %}
+    </ul>
+
+    <a href="{% url 'index' %}">All Listings</a>
+{% endblock %}

auctions/urls.py

@@ -6,5 +6,6 @@
     path("", views.index, name="index"),
     path("login", views.login_view, name="login"),
     path("logout", views.logout_view, name="logout"),
-    path("register", views.register, name="register")
+    path("register", views.register, name="register"),
+    path("<int:listing_id>", views.listing, name="listing"),
 ]

auctions/views.py

@@ -63,3 +63,12 @@ def register(request):
         return HttpResponseRedirect(reverse("index"))
     else:
         return render(request, "auctions/register.html")
+
+
+def listing(request, listing_id):
+    auction = Listing.objects.get(id=listing_id)
+    bidings = auction.bidings.all()
+    return render(request, "auctions/listing.html", {
+        "listing": auction,
+        "bidings": bidings
+    })