added application page

Controllers/Postgres/filter.py

@@ -4,8 +4,8 @@ Advanced filtering functionality for SQLAlchemy models.
 This module provides a comprehensive set of filtering capabilities for SQLAlchemy models,
 including pagination, ordering, and complex query building.
 """
-
 from __future__ import annotations
+
 import arrow
 
 from typing import Any, TypeVar, Type, Union, Optional
@@ -23,7 +23,7 @@ T = TypeVar("T", bound="QueryModel")
 class QueryModel:
 
     __abstract__ = True
-    pre_query = None
+    pre_query: Optional[Query] = None
 
     @classmethod
     def _query(cls: Type[T], db: Session) -> Query:
@@ -149,11 +149,29 @@ class QueryModel:
         Returns:
             Tuple of SQLAlchemy filter expressions or None if validation fails
         """
-        if validate_model is not None:
-            # Add validation logic here if needed
-            pass
-
-        return tuple(cls.filter_expr(**smart_options))
+        try:
+            # Let SQLAlchemy handle the validation by attempting to create the filter expressions
+            return tuple(cls.filter_expr(**smart_options))
+        except Exception as e:
+            # If there's an error, provide a helpful message with valid columns and relationships
+            valid_columns = set()
+            relationship_names = set()
+            
+            # Get column names if available
+            if hasattr(cls, '__table__') and hasattr(cls.__table__, 'columns'):
+                valid_columns = set(column.key for column in cls.__table__.columns)
+            
+            # Get relationship names if available
+            if hasattr(cls, '__mapper__') and hasattr(cls.__mapper__, 'relationships'):
+                relationship_names = set(rel.key for rel in cls.__mapper__.relationships)
+            
+            # Create a helpful error message
+            error_msg = f"Error in filter expression: {str(e)}\n"
+            error_msg += f"Attempted to filter with: {smart_options}\n"
+            error_msg += f"Valid columns are: {', '.join(valid_columns)}\n"
+            error_msg += f"Valid relationships are: {', '.join(relationship_names)}"
+            
+            raise ValueError(error_msg) from e
 
     @classmethod
     def filter_by_one(