feat: Filter response fields (#40)

* feat: Filter response fields

* changes

* changes

creyPY/fastapi/crud.py

@@ -1,4 +1,4 @@
-from typing import Type, TypeVar, overload
+from typing import Type, TypeVar, overload, List
 from uuid import UUID
 
 from fastapi import HTTPException
@@ -19,13 +19,14 @@ async def get_object_or_404(
     db: AsyncSession,
     expunge: bool = False,
     lookup_column: str = "id",
+    response_fields: List[str] = []
 ) -> T:
     pass
 
 
 @overload
 def get_object_or_404(
-    db_class: Type[T], id: UUID | str, db: Session, expunge: bool = False, lookup_column: str = "id"
+    db_class: Type[T], id: UUID | str, db: Session, expunge: bool = False, lookup_column: str = "id", response_fields: List[str] = []
 ) -> T:
     pass
 
@@ -36,10 +37,15 @@ def get_object_or_404(
     db: Session | AsyncSession,
     expunge: bool = False,
     lookup_column: str = "id",
+    response_fields: List[str] = []
 ) -> T:
 
     async def _get_async_object() -> T:
-        query = select(db_class).filter(getattr(db_class, lookup_column) == id)
+        if response_fields:
+            selected_columns = [getattr(db_class, field) for field in response_fields if hasattr(db_class, field)]
+            query = select(*selected_columns).select_from(db_class)
+        else:
+            query = select(db_class).filter(getattr(db_class, lookup_column) == id)
         result = await db.execute(query)
         obj = result.scalar_one_or_none()
         if obj is None:
@@ -49,7 +55,12 @@ def get_object_or_404(
         return obj
 
     def _get_sync_object() -> T:
-        obj = db.query(db_class).filter(getattr(db_class, lookup_column) == id).one_or_none()
+        if response_fields:
+            selected_columns = [getattr(db_class, field) for field in response_fields if hasattr(db_class, field)]
+            query = db.query(*selected_columns).filter(getattr(db_class, lookup_column) == id)
+        else:
+            query = db.query(db_class).filter(getattr(db_class, lookup_column) == id)
+        obj = query.one_or_none()
         if obj is None:
             raise HTTPException(status_code=404, detail="The object does not exist.")  # type: ignore
         if expunge:

creyPY/fastapi/schemas/response_schema.py

@@ -0,0 +1,39 @@
+from typing import List, Optional, Type
+from pydantic import BaseModel, create_model
+from fastapi import Query
+class ResponseModelDependency:
+    def __init__(self, model_class: Type[BaseModel]):
+        self.model_class = model_class
+    
+    def __call__(self, response_fields: Optional[List[str]] = Query(None)) -> Type[BaseModel]:
+        def process_result(result, fields=None):
+            if not fields:
+                return result
+                
+            if hasattr(result, '_fields'):
+                row_fields = result._fields
+                return dict(zip(row_fields, result))
+            elif isinstance(result, tuple):
+                return dict(zip(fields, result))
+            elif isinstance(result, dict):
+                return result
+            else:
+                return {field: getattr(result, field) for field in fields if hasattr(result, field)}
+        
+        if not response_fields:
+            return self.model_class, None, process_result
+        
+        all_annotations = {}
+        for cls in self.model_class.__mro__:
+            if hasattr(cls, '__annotations__'):
+                all_annotations.update(cls.__annotations__)
+    
+        fields = {}
+        for field in response_fields:
+            if field in all_annotations:
+                fields[field] = (all_annotations[field], None)
+        
+        dynamic_model = create_model(f'Dynamic{self.model_class.__name__}', **fields)
+        
+        return dynamic_model, response_fields, process_result
+