mute user: Add model and makemigrations.

This commit adds a new database table to support
muting users, and generates a migration file for
the same.

zerver/migrations/0314_muted_user.py

@@ -0,0 +1,47 @@
+# Generated by Django 3.1.5 on 2021-02-12 12:10
+
+import django.db.models.deletion
+import django.utils.timezone
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("zerver", "0313_finish_is_user_active_migration"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="MutedUser",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
+                    ),
+                ),
+                ("date_muted", models.DateTimeField(default=django.utils.timezone.now)),
+                (
+                    "muted_user_profile",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="+",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                (
+                    "user_profile",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="+",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+            ],
+            options={
+                "unique_together": {("user_profile", "muted_user_profile")},
+            },
+        ),
+    ]

zerver/models.py

@@ -1845,6 +1845,18 @@ class MutedTopic(models.Model):
         return f"<MutedTopic: ({self.user_profile.email}, {self.stream.name}, {self.topic_name}, {self.date_muted})>"
 
 
+class MutedUser(models.Model):
+    user_profile = models.ForeignKey(UserProfile, related_name="+", on_delete=CASCADE)
+    muted_user_profile = models.ForeignKey(UserProfile, related_name="+", on_delete=CASCADE)
+    date_muted: datetime.datetime = models.DateTimeField(default=timezone_now)
+
+    class Meta:
+        unique_together = ("user_profile", "muted_user_profile")
+
+    def __str__(self) -> str:
+        return f"<MutedUser: {self.user_profile.email} -> {self.muted_user_profile.email}>"
+
+
 class Client(models.Model):
     id: int = models.AutoField(auto_created=True, primary_key=True, verbose_name="ID")
     name: str = models.CharField(max_length=30, db_index=True, unique=True)