apply languages

Messaging/admin.py

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+from django.contrib import admin
+from Messaging.models import *
+
+# Register your models here.
+
+admin.site.register(Message)
+admin.site.register(Chat)
+admin.site.register(Membership)

Messaging/apps.py

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+from django.apps import AppConfig
+
+
+class MessagingConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'Messaging'

Messaging/migrations/0001_initial.py

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+# Generated by Django 3.2.4 on 2022-02-17 19:53
+
+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 = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Chat',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.TextField()),
+                ('is_group', models.BooleanField()),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Message',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('text', models.TextField()),
+                ('time_sent', models.DateTimeField(default=django.utils.timezone.now)),
+                ('is_read', models.BooleanField(default=False)),
+                ('chat', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='Messaging.chat')),
+                ('sender', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Membership',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('chat', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='Messaging.chat')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.AddField(
+            model_name='chat',
+            name='last_message',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='+', to='Messaging.message'),
+        ),
+    ]

Messaging/migrations/0002_alter_chat_last_message.py

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+# Generated by Django 3.2.4 on 2022-02-17 20:20
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('Messaging', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='chat',
+            name='last_message',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='+', to='Messaging.message'),
+        ),
+    ]

Messaging/migrations/0003_remove_chat_last_message.py

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+# Generated by Django 3.2.4 on 2022-02-18 08:37
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('Messaging', '0002_alter_chat_last_message'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='chat',
+            name='last_message',
+        ),
+    ]

Messaging/migrations/0004_chat_last_message.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.4 on 2022-02-18 08:43
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('Messaging', '0003_remove_chat_last_message'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='chat',
+            name='last_message',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='+', to='Messaging.message'),
+        ),
+    ]

Messaging/models.py

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+from django.contrib.auth.models import User
+from django.db import models
+from django.utils import timezone
+
+
+class Chat(models.Model):
+    name = models.TextField()
+    is_group = models.BooleanField()
+    last_message = models.ForeignKey("Message", null=True, on_delete=models.SET_NULL, related_name='+')
+
+
+class Membership(models.Model):
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
+    chat = models.ForeignKey(Chat, on_delete=models.CASCADE)
+
+
+class Message(models.Model):
+    chat = models.ForeignKey(Chat, on_delete=models.CASCADE)
+    sender = models.ForeignKey(User, null=True, on_delete=models.SET_NULL)
+    text = models.TextField()
+    time_sent = models.DateTimeField(default=timezone.now)
+    is_read = models.BooleanField(default=False)

Messaging/tests.py

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

Messaging/urls.py

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+from django.urls import path
+
+from Messaging import views
+
+urlpatterns = [
+    path("chat_window", views.chat_window),
+]

Messaging/views.py

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+from django.shortcuts import render
+
+from Messaging.models import Chat, Message, Membership
+from SprintLib.BaseView import AccessError
+
+page_size = 20
+
+
+def chat_window(request):
+    chat = None if request.GET['chat_id'] == '-1' else Chat.objects.get(id=request.GET['chat_id'])
+    if chat is not None:
+        if Membership.objects.filter(user=request.user, chat=chat).first() is None:
+            raise AccessError()
+    page = None if request.GET['page'] == '-1' else int(request.GET['page'])
+    memberships = Membership.objects.filter(user=request.user).order_by('-chat__last_message__time_sent')
+    messages = []
+    if chat is not None:
+        offset = page_size * (page - 1)
+        limit = page_size
+        Message.objects.filter(chat=chat, is_read=False).update(is_read=True)
+        messages = Message.objects.filter(chat=chat).order_by('-time_sent')[offset:offset + limit]
+    return render(request, "chat_window.html", context={
+        "memberships": memberships,
+        "messages": messages,
+        "current_chat": chat,
+    })