I can save and load Datagrid content

requirements.txt

@@ -37,17 +37,20 @@ markdown-it-py==4.0.0
 mdurl==0.1.2
 more-itertools==10.8.0
 myauth==0.2.1
-mydbengine==0.1.0
-myutils==0.5.0
+mydbengine==0.2.1
+-e git+ssh://git@sheerka.synology.me:1010/kodjo/MyFastHtml.git@2f808ed226e98738a1cf476e1f1dda8a1d9118b0#egg=myfasthtml
+myutils==0.5.1
 nh3==0.3.1
 numpy==2.3.5
 oauthlib==3.3.1
 openpyxl==3.1.5
 packaging==25.0
 pandas==2.3.3
+pandas-stubs==2.3.3.251201
 passlib==1.7.4
 pipdeptree==2.29.0
 pluggy==1.6.0
+pyarrow==22.0.0
 pyasn1==0.6.1
 pycparser==2.23
 pydantic==2.12.3

src/app.py

@@ -1,6 +1,9 @@
+import json
 import logging.config
 
+import pandas as pd
 import yaml
+from dbengine.handlers import BaseRefHandler, handlers
 from fasthtml import serve
 from fasthtml.components import Div
 
@@ -35,6 +38,23 @@ app, rt = create_app(protect_routes=True,
                      base_url="http://localhost:5003")
 
 
+class DataFrameHandler(BaseRefHandler):
+  def is_eligible_for(self, obj):
+    return isinstance(obj, pd.DataFrame)
+  
+  def tag(self):
+    return "DataFrame"
+  
+  def serialize_to_bytes(self, df) -> bytes:
+    from io import BytesIO
+    import pickle
+    return pickle.dumps(df)
+
+  def deserialize_from_bytes(self, data: bytes):
+    import pickle
+    return pickle.loads(data)
+
+
 def create_sample_treeview(parent):
   """
   Create a sample TreeView with a file structure for testing.
@@ -83,7 +103,9 @@ def create_sample_treeview(parent):
 
 @rt("/")
 def index(session):
-  session_instance = UniqueInstance(session=session, _id=Ids.UserSession)
+  session_instance = UniqueInstance(session=session,
+                                    _id=Ids.UserSession,
+                                    on_init=lambda: handlers.register_handler(DataFrameHandler()))
   layout = Layout(session_instance, "Testing Layout")
   layout.footer_left.add("Goodbye World")
   

src/myfasthtml/controls/DataGrid.py

@@ -12,7 +12,7 @@ from myfasthtml.core.instances import MultipleInstance
 
 class DatagridState(DbObject):
   def __init__(self, owner):
-    super().__init__(owner)
+    super().__init__(owner, name=f"{owner.get_full_id()}-state")
     with self.initializing():
       self.sidebar_visible: bool = False
       self.selected_view: str = None
@@ -25,12 +25,12 @@ class DatagridState(DbObject):
       self.filtered: dict = {}
       self.edition: DatagridEditionState = DatagridEditionState()
       self.selection: DatagridSelectionState = DatagridSelectionState()
-      self.html = None
+      self.ne_data = None
 
 
 class DatagridSettings(DbObject):
   def __init__(self, owner):
-    super().__init__(owner)
+    super().__init__(owner, name=f"{owner.get_full_id()}-settings")
     with self.initializing():
       self.file_name: Optional[str] = None
       self.selected_sheet_name: Optional[str] = None
@@ -52,12 +52,13 @@ class DataGrid(MultipleInstance):
     self._state = DatagridState(self)
     self.commands = Commands(self)
   
-  def set_html(self, html):
-    self._state.html = html
+  def init_from_dataframe(self, df):
+    self._state.ne_data = df
   
   def render(self):
+    html = self._state.ne_data.to_html(index=False) if self._state.ne_data is not None else "Content lost !"
     return Div(
-      NotStr(self._state.html) if self._state.html else "Content lost !",
+      NotStr(html),
       id=self._id
     )
   

src/myfasthtml/controls/DataGridsManager.py

@@ -23,7 +23,7 @@ class DocumentDefinition:
   document_id: str
   namespace: str
   name: str
-  type: str
+  type: str # table, card,
   tab_id: str
   datagrid_id: str
 
@@ -32,7 +32,7 @@ class DataGridsState(DbObject):
   def __init__(self, owner, name=None):
     super().__init__(owner, name=name)
     with self.initializing():
-      self.elements: list = [DocumentDefinition]
+      self.elements: list[DocumentDefinition] = []
 
 
 class Commands(BaseCommands):
@@ -91,9 +91,8 @@ class DataGridsManager(MultipleInstance):
   def open_from_excel(self, tab_id, file_upload: FileUpload):
     excel_content = file_upload.get_content()
     df = pd.read_excel(excel_content, file_upload.get_sheet_name())
-    html = df.to_html(index=False)
     dg = DataGrid(self._tabs_manager)
-    dg.set_html(html)
+    dg.init_from_dataframe(df)
     document = DocumentDefinition(
       document_id=str(uuid.uuid4()),
       namespace=file_upload.get_file_basename(),

src/myfasthtml/core/dbmanager.py

@@ -55,13 +55,14 @@ class DbObject:
       self._initializing = old_state
   
   def __setattr__(self, name: str, value: str):
-    if name.startswith("_") or name.startswith("ns") or getattr(self, "_initializing", False):
+    if name.startswith("_") or name.startswith("ns_") or getattr(self, "_initializing", False):
       super().__setattr__(name, value)
       return
     
-    old_value = getattr(self, name, None)
-    if old_value == value:
-      return
+    if not name.startswith("ne_"):
+      old_value = getattr(self, name, None)
+      if old_value == value:
+        return
     
     super().__setattr__(name, value)
     self._save_self()

src/myfasthtml/core/instances.py

@@ -144,8 +144,11 @@ class UniqueInstance(BaseInstance):
                parent: Optional[BaseInstance] = None,
                session: Optional[dict] = None,
                _id: Optional[str] = None,
-               auto_register: bool = True):
+               auto_register: bool = True,
+               on_init=None):
     super().__init__(parent, session, _id, auto_register)
+    if on_init is not None:
+      on_init()
 
 
 class MultipleInstance(BaseInstance):