Use recognizable DB model names to ease selection UX on Admin Panel

Previously id were used (by default) for model display strings.
This made it hard to select chat model options, server chat settings
etc. in the admin panel dropdowns.

This change uses more recognizable names for the DB objects to ease
selection in dropdowns and display in general on the admin panel.

src/khoj/database/admin.py

@@ -217,10 +217,10 @@ class ChatModelOptionsAdmin(unfold_admin.ModelAdmin):
     list_display = (
         "id",
         "chat_model",
-        "model_type",
+        "ai_model_api",
         "max_prompt_size",
     )
-    search_fields = ("id", "chat_model", "model_type")
+    search_fields = ("id", "chat_model", "ai_model_api__name")
 
 
 @admin.register(TextToImageModelConfig)
@@ -288,7 +288,7 @@ class ConversationAdmin(unfold_admin.ModelAdmin):
         "client",
     )
     search_fields = ("id", "user__email", "user__username", "client__name")
-    list_filter = ("agent",)
+    list_filter = ("agent", "client", "user")
     ordering = ("-created_at",)
 
     actions = ["export_selected_objects", "export_selected_minimal_objects"]

src/khoj/database/models/__init__.py

@@ -144,6 +144,9 @@ class KhojUser(AbstractUser):
             self.uuid = uuid.uuid4()
         super().save(*args, **kwargs)
 
+    def __str__(self):
+        return f"{self.username} ({self.uuid})"
+
 
 class GoogleUser(models.Model):
     user = models.OneToOneField(KhojUser, on_delete=models.CASCADE)
@@ -186,6 +189,9 @@ class AiModelApi(DbBaseModel):
     api_key = models.CharField(max_length=200)
     api_base_url = models.URLField(max_length=200, default=None, blank=True, null=True)
 
+    def __str__(self):
+        return self.name
+
 
 class ChatModelOptions(DbBaseModel):
     class ModelType(models.TextChoices):
@@ -202,6 +208,9 @@ class ChatModelOptions(DbBaseModel):
     vision_enabled = models.BooleanField(default=False)
     ai_model_api = models.ForeignKey(AiModelApi, on_delete=models.CASCADE, default=None, null=True, blank=True)
 
+    def __str__(self):
+        return self.chat_model
+
 
 class VoiceModelOption(DbBaseModel):
     model_id = models.CharField(max_length=200)
@@ -307,6 +316,9 @@ class Agent(DbBaseModel):
 
         super().save(*args, **kwargs)
 
+    def __str__(self):
+        return self.name
+
 
 class ProcessLock(DbBaseModel):
     class Operation(models.TextChoices):
@@ -420,6 +432,9 @@ class WebScraper(DbBaseModel):
 
         super().save(*args, **kwargs)
 
+    def __str__(self):
+        return self.name
+
 
 class ServerChatSettings(DbBaseModel):
     chat_default = models.ForeignKey(
@@ -492,6 +507,9 @@ class SearchModelConfig(DbBaseModel):
     # The confidence threshold of the bi_encoder model to consider the embeddings as relevant
     bi_encoder_confidence_threshold = models.FloatField(default=0.18)
 
+    def __str__(self):
+        return self.name
+
 
 class TextToImageModelConfig(DbBaseModel):
     class ModelType(models.TextChoices):
@@ -527,6 +545,9 @@ class TextToImageModelConfig(DbBaseModel):
         self.clean()
         super().save(*args, **kwargs)
 
+    def __str__(self):
+        return f"{self.model_name} - {self.model_type}"
+
 
 class SpeechToTextModelOptions(DbBaseModel):
     class ModelType(models.TextChoices):
@@ -536,6 +557,9 @@ class SpeechToTextModelOptions(DbBaseModel):
     model_name = models.CharField(max_length=200, default="base")
     model_type = models.CharField(max_length=200, choices=ModelType.choices, default=ModelType.OFFLINE)
 
+    def __str__(self):
+        return f"{self.model_name} - {self.model_type}"
+
 
 class UserConversationConfig(DbBaseModel):
     user = models.OneToOneField(KhojUser, on_delete=models.CASCADE)