Initial working version with minor bugs

cards/admin.py

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+from django.contrib import admin
+from .models import CardSet, Deck, Card, Rarity, DeckNameTranslation, CardNameTranslation
+
+admin.site.register(CardSet)
+admin.site.register(Deck)
+admin.site.register(Card)
+admin.site.register(Rarity)
+admin.site.register(DeckNameTranslation)
+admin.site.register(CardNameTranslation)

cards/apps.py

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+from django.apps import AppConfig
+
+
+class CardsConfig(AppConfig):
+    name = "cards"

cards/migrations/0001_initial.py

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+# Generated by Django 5.1.2 on 2025-02-26 08:04
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Card',
+            fields=[
+                ('id', models.AutoField(primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=64)),
+                ('cardnum', models.IntegerField()),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='CardSet',
+            fields=[
+                ('id', models.AutoField(primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=64)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Rarity',
+            fields=[
+                ('id', models.AutoField(primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=64)),
+                ('icons', models.CharField(max_length=64)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='CardNameTranslation',
+            fields=[
+                ('id', models.AutoField(primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=64)),
+                ('language', models.CharField(max_length=64)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('card', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='name_translations', to='cards.card')),
+            ],
+        ),
+        migrations.AddField(
+            model_name='card',
+            name='cardset',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='cards', to='cards.cardset'),
+        ),
+        migrations.CreateModel(
+            name='Deck',
+            fields=[
+                ('id', models.AutoField(primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=64)),
+                ('hex_color', models.CharField(max_length=9)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('cardset', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='decks', to='cards.cardset')),
+            ],
+        ),
+        migrations.AddField(
+            model_name='card',
+            name='decks',
+            field=models.ManyToManyField(to='cards.deck'),
+        ),
+        migrations.CreateModel(
+            name='DeckNameTranslation',
+            fields=[
+                ('id', models.AutoField(primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=64)),
+                ('language', models.CharField(max_length=64)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('deck', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='name_translations', to='cards.deck')),
+            ],
+        ),
+        migrations.AddField(
+            model_name='card',
+            name='rarity',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='cards', to='cards.rarity'),
+        ),
+    ]

cards/models.py

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+from django.db import models
+
+class DeckNameTranslation(models.Model):
+  id = models.AutoField(primary_key=True)
+  name = models.CharField(max_length=64)
+  deck = models.ForeignKey("Deck", on_delete=models.PROTECT, related_name='name_translations')
+  language = models.CharField(max_length=64)
+  created_at = models.DateTimeField(auto_now_add=True)
+  updated_at = models.DateTimeField(auto_now=True)
+
+  def __str__(self):
+    return self.name
+
+class CardNameTranslation(models.Model):
+  id = models.AutoField(primary_key=True)
+  name = models.CharField(max_length=64)
+  card = models.ForeignKey("Card", on_delete=models.PROTECT, related_name='name_translations')
+  language = models.CharField(max_length=64)
+  created_at = models.DateTimeField(auto_now_add=True)
+  updated_at = models.DateTimeField(auto_now=True)
+
+  def __str__(self):
+    return self.name
+
+class CardSet(models.Model):
+  id = models.AutoField(primary_key=True)
+  name = models.CharField(max_length=64)
+  created_at = models.DateTimeField(auto_now_add=True)
+  updated_at = models.DateTimeField(auto_now=True)
+
+  def __str__(self):
+    return self.name
+
+class Deck(models.Model):
+  id = models.AutoField(primary_key=True)
+  name = models.CharField(max_length=64)
+  hex_color = models.CharField(max_length=9)
+  cardset = models.ForeignKey("CardSet", on_delete=models.PROTECT, related_name='decks')
+  created_at = models.DateTimeField(auto_now_add=True)
+  updated_at = models.DateTimeField(auto_now=True)
+
+  def __str__(self):
+    return self.name
+
+class Rarity(models.Model):
+  id = models.AutoField(primary_key=True)
+  name = models.CharField(max_length=64)
+  icons = models.CharField(max_length=64)
+  created_at = models.DateTimeField(auto_now_add=True)
+  updated_at = models.DateTimeField(auto_now=True)
+
+  def __str__(self):
+    return self.name
+
+class Card(models.Model):
+  id = models.AutoField(primary_key=True)
+  name = models.CharField(max_length=64)
+  decks = models.ManyToManyField("Deck")
+  cardset = models.ForeignKey("CardSet", on_delete=models.PROTECT, related_name='cards')
+  cardnum = models.IntegerField()
+  rarity = models.ForeignKey(Rarity, on_delete=models.PROTECT, related_name='cards')
+  created_at = models.DateTimeField(auto_now_add=True)
+  updated_at = models.DateTimeField(auto_now=True)
+
+  def __str__(self):
+    return self.name + " " + self.rarity.icons + " " + self.cardset.name

cards/templatetags/card_badge.py

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+from django import template
+
+register = template.Library()
+
+@register.inclusion_tag("includes/card_badge.html")
+def card_badge(card):
+    return {
+        'card': card,
+        'decks': card.decks.all() if card else None,
+        'dropdown': card is None
+    }

cards/templatetags/card_multiselect.py

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+from django import template
+from cards.models import Card
+
+register = template.Library()
+
+@register.inclusion_tag('includes/card_multiselect.html')
+def card_multiselect(field_name, label, available_cards, placeholder, selected_values=None, cache_timeout=86400, cache_key="available_cards_options"):
+    """
+    Renders a Select2 field for choosing cards.
+    
+    Parameters:
+      - field_name: The name attribute for the select tag.
+      - label: Label text to show above the selector.
+      - available_cards: A queryset or list of card objects that will populate the options.
+      - placeholder: Placeholder text to show in the select.
+      - selected_values: (Optional) A list of selected card IDs (will be compared as strings).
+      - cache_timeout: (Optional) Cache timeout (in seconds) for the options block.
+      - cache_key: (Optional) Cache key—by default both select fields use the same key so that caching is shared.
+    """
+    if selected_values is None:
+        selected_values = []
+    # Normalize selected_values to strings.
+    selected_values = [str(val) for val in selected_values]
+
+    # --- Available cards for the search form ---
+    available_cards = list(
+        Card.objects.order_by("name", "rarity__pk")
+        .select_related("rarity", "cardset")
+        .prefetch_related("decks")
+    )
+    for card in available_cards:
+        if card.decks.count() == 1:
+            card.style = "background-color: " + card.decks.all()[0].hex_color + "; color: white;"
+        elif card.decks.count() == 2:
+            card.style = "background: linear-gradient(to right, " + card.decks.all()[0].hex_color + ", " + card.decks.all()[1].hex_color + "); color: white;"
+        elif card.decks.count() >= 3:
+            card.style = "background: linear-gradient(to right, " + card.decks.all()[0].hex_color + ", " + card.decks.all()[1].hex_color + ", " + card.decks.all()[2].hex_color + "); color: white;"
+        
+    return {
+        'field_name': field_name,
+        'field_id': field_name,  # using the name as id for simplicity
+        'label': label,
+        'available_cards': available_cards,
+        'placeholder': placeholder,
+        'selected_values': selected_values,
+        'cache_timeout': cache_timeout,
+        'cache_key': cache_key,
+    }

cards/tests.py

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

cards/urls.py

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+from django.urls import path
+
+
+urlpatterns = [
+]

cards/views.py

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+from django.views.generic import TemplateView
+from django.urls import reverse_lazy
+from django.views.generic import UpdateView, DeleteView, CreateView, ListView, DetailView
+