I can persist tabmanager state

src/app.py

@@ -5,7 +5,8 @@ from fasthtml.components import *
 
 from myfasthtml.controls.Layout import Layout
 from myfasthtml.controls.TabsManager import TabsManager
-from myfasthtml.controls.helpers import Ids
+from myfasthtml.controls.helpers import Ids, mk
+from myfasthtml.core.commands import Command
 from myfasthtml.core.instances import InstancesManager
 from myfasthtml.myfastapp import create_app
 
@@ -30,11 +31,14 @@ def index(session):
   for i in range(1000):
     layout.left_drawer.append(Div(f"Left Drawer Item {i}"))
   
-  tabs_manager = InstancesManager.get(session, Ids.TabsManager, TabsManager)
-  tabs_manager.add_tab("Users", Div("Content 1"))
-  tabs_manager.add_tab("Users", Div("Content 2"))
-  tabs_manager.add_tab("Users", Div("Content 3"))
+  tabs_manager = TabsManager(session, _id="main")
+  btn = mk.button("Add Tab",
+                  command=Command("AddTab",
+                                  "Add a new tab",
+                                  tabs_manager.on_new_tab, "Tabs", Div("Content")).
+                  htmx(target=f"#{tabs_manager.get_id()}"))
   layout.set_main(tabs_manager)
+  layout.set_footer(btn)
   return layout
 
 

src/myfasthtml/controls/BaseCommands.py

@@ -1,4 +1,5 @@
 class BaseCommands:
   def __init__(self, owner):
     self._owner = owner
-    self._id = owner.get_id()
+    self._id = owner.get_id()
+    self._prefix = owner.get_prefix()

src/myfasthtml/controls/TabsManager.py

@@ -1,11 +1,11 @@
 import uuid
-from dataclasses import dataclass
 from typing import Any
 
 from fasthtml.common import Div, Button, Span
 
 from myfasthtml.controls.BaseCommands import BaseCommands
-from myfasthtml.controls.helpers import Ids
+from myfasthtml.controls.helpers import Ids, mk
+from myfasthtml.core.commands import Command
 from myfasthtml.core.dbmanager import DbObject
 from myfasthtml.core.instances import MultipleInstance, BaseInstance
 from myfasthtml.icons.fluent_p3 import dismiss_circle16_regular
@@ -35,18 +35,25 @@ class TabsManagerState(DbObject):
 
 
 class Commands(BaseCommands):
-  pass
+  def show_tab(self, tab_id):
+    return Command(f"{self._prefix}SowTab",
+                   "Activate or show a specific tab",
+                   self._owner.show_tab, tab_id).htmx(target=f"#{self._id}", swap="outerHTML")
 
 
 class TabsManager(MultipleInstance):
-  def __init__(self, session):
-    super().__init__(session, Ids.TabsManager)
+  def __init__(self, session, _id=None):
+    super().__init__(session, Ids.TabsManager, _id=_id)
     self._state = TabsManagerState(self)
-    self._commands = Commands(self)
+    self.commands = Commands(self)
   
   def get_state(self):
     return self._state
   
+  def on_new_tab(self, label: str, component: Any):
+    self.add_tab(label, component)
+    return self
+  
   def add_tab(self, label: str, component: Any, activate: bool = True) -> str:
     """
     Add a new tab or update an existing one with the same component type, ID and label.
@@ -108,6 +115,13 @@ class TabsManager(MultipleInstance):
     
     return tab_id
   
+  def show_tab(self, tab_id):
+    if tab_id not in self._state.tabs:
+      return None
+    
+    self._state.active_tab = tab_id
+    return self
+  
   def _mk_tab_button(self, tab_id: str, tab_data: dict):
     """
     Create a single tab button with its label and close button.
@@ -122,7 +136,7 @@ class TabsManager(MultipleInstance):
     is_active = tab_id == self._state.active_tab
     
     return Button(
-      Span(tab_data.get("label", "Untitled"), cls="mf-tab-label"),
+      mk.mk(Span(tab_data.get("label", "Untitled"), cls="mf-tab-label"), command=self.commands.show_tab(tab_id)),
       Span(dismiss_circle16_regular, cls="mf-tab-close-btn"),
       cls=f"mf-tab-button {'mf-tab-active' if is_active else ''}",
       data_tab_id=tab_id,

src/myfasthtml/core/dbmanager.py

@@ -42,14 +42,7 @@ class DbObject:
     self._name = name or self.__class__.__name__
     self._db_manager = db_manager or InstancesManager.get(self._session, Ids.DbManager, DbManager)
     
-    # init is possible
-    if self._db_manager.exists_entry(self._name):
-      props = self._db_manager.load(self._name)
-      for k, v in props.items():
-        if hasattr(self, k):
-          setattr(self, k, v)
-    else:
-      self._save_self()
+    self._finalize_initialization()
   
   @contextmanager
   def initializing(self):
@@ -58,8 +51,8 @@ class DbObject:
     try:
       yield
     finally:
+      self._finalize_initialization()
       self._initializing = old_state
-      self._save_self()
   
   def __setattr__(self, name: str, value: str):
     if name.startswith("_") or getattr(self, "_initializing", False):
@@ -73,6 +66,13 @@ class DbObject:
     super().__setattr__(name, value)
     self._save_self()
   
+  def _finalize_initialization(self):
+    if self._db_manager.exists_entry(self._name):
+      props = self._db_manager.load(self._name)
+      self.update(props)
+    else:
+      self._save_self()
+  
   def _save_self(self):
     props = {k: getattr(self, k) for k, v in self._get_properties().items() if not k.startswith("_")}
     if props:
@@ -103,11 +103,14 @@ class DbObject:
     
     properties |= kwargs
     
-    with self.initializing():
-      for k, v in properties.items():
-        if hasattr(self, k) and k not in DbObject._forbidden_attrs:  # internal variables cannot be updated
-          setattr(self, k, v)
+    # save the new state
+    old_state = getattr(self, "_initializing", False)
+    self._initializing = True
+    for k, v in properties.items():
+      if hasattr(self, k) and k not in DbObject._forbidden_attrs:  # internal variables cannot be updated
+        setattr(self, k, v)
     self._save_self()
+    self._initializing = old_state
   
   def copy(self):
     as_dict = self._get_properties().copy()

src/myfasthtml/core/instances.py

@@ -17,9 +17,10 @@ class BaseInstance:
   Base class for all instances (manageable by InstancesManager)
   """
   
-  def __init__(self, session: dict, _id: str, auto_register: bool = True):
+  def __init__(self, session: dict, prefix: str, _id: str, auto_register: bool = True):
     self._session = session
     self._id = _id
+    self._prefix = prefix
     if auto_register:
       InstancesManager.register(session, self)
   
@@ -28,6 +29,9 @@ class BaseInstance:
   
   def get_session(self):
     return self._session
+  
+  def get_prefix(self):
+    return self._prefix
 
 
 class SingleInstance(BaseInstance):
@@ -36,8 +40,7 @@ class SingleInstance(BaseInstance):
   """
   
   def __init__(self, session: dict, prefix: str, auto_register: bool = True):
-    super().__init__(session, prefix, auto_register)
-    self._instance = None
+    super().__init__(session, prefix, prefix, auto_register)
 
 
 class UniqueInstance(BaseInstance):
@@ -47,8 +50,8 @@ class UniqueInstance(BaseInstance):
   """
   
   def __init__(self, session: dict, prefix: str, auto_register: bool = True):
-    super().__init__(session, prefix, auto_register)
-    self._instance = None
+    super().__init__(session, prefix, prefix, auto_register)
+    self._prefix = prefix
 
 
 class MultipleInstance(BaseInstance):
@@ -56,9 +59,9 @@ class MultipleInstance(BaseInstance):
   Base class for instances that can have multiple instances at a time.
   """
   
-  def __init__(self, session: dict, prefix: str, auto_register: bool = True):
-    super().__init__(session, f"{prefix}-{str(uuid.uuid4())}", auto_register)
-    self._instance = None
+  def __init__(self, session: dict, prefix: str, auto_register: bool = True, _id=None):
+    super().__init__(session, prefix, f"{prefix}-{_id or str(uuid.uuid4())}", auto_register)
+    self._prefix = prefix
 
 
 class InstancesManager:

src/myfasthtml/test/matcher.py

@@ -90,6 +90,14 @@ class Empty(ChildrenPredicate):
     return len(actual.children) == 0 and len(actual.attrs) == 0
 
 
+class NoChildren(ChildrenPredicate):
+  def __init__(self):
+    super().__init__(None)
+  
+  def validate(self, actual):
+    return len(actual.children) == 0
+
+
 class AttributeForbidden(ChildrenPredicate):
   """
   To validate that an attribute is not present in an element.

tests/controls/test_tabsmanager.py

@@ -3,6 +3,7 @@ from fasthtml.components import *
 
 from myfasthtml.controls.TabsManager import TabsManager
 from myfasthtml.core.instances import InstancesManager
+from myfasthtml.test.matcher import matches, NoChildren
 from .conftest import session
 
 
@@ -13,18 +14,75 @@ def tabs_manager(session):
   InstancesManager.reset()
 
 
-def test_tabs_manager_is_registered(session, tabs_manager):
-  from_instance_manager = InstancesManager.get(session, tabs_manager.get_id())
-  assert from_instance_manager == tabs_manager
-
-
-def test_i_can_add_tab(tabs_manager):
-  tab_id = tabs_manager.add_tab("Users", Div("Content 1"))
+class TestTabsManagerBehaviour:
+  def test_tabs_manager_is_registered(self, session, tabs_manager):
+    from_instance_manager = InstancesManager.get(session, tabs_manager.get_id())
+    assert from_instance_manager == tabs_manager
   
-  assert tab_id is not None
-  assert tab_id in tabs_manager.get_state().tabs
-  assert tabs_manager.get_state().tabs[tab_id]["label"] == "Users"
-  assert tabs_manager.get_state().tabs[tab_id]["component_type"] is None  # Div is not BaseInstance
-  assert tabs_manager.get_state().tabs[tab_id]["component_id"] is None  # Div is not BaseInstance
-  assert tabs_manager.get_state().tabs_order == [tab_id]
-  assert tabs_manager.get_state().active_tab == tab_id
+  def test_i_can_add_tab(self, tabs_manager):
+    tab_id = tabs_manager.add_tab("Users", Div("Content 1"))
+    
+    assert tab_id is not None
+    assert tab_id in tabs_manager.get_state().tabs
+    assert tabs_manager.get_state().tabs[tab_id]["label"] == "Users"
+    assert tabs_manager.get_state().tabs[tab_id]["component_type"] is None  # Div is not BaseInstance
+    assert tabs_manager.get_state().tabs[tab_id]["component_id"] is None  # Div is not BaseInstance
+    assert tabs_manager.get_state().tabs_order == [tab_id]
+    assert tabs_manager.get_state().active_tab == tab_id
+  
+  def test_i_can_add_multiple_tabs(self, tabs_manager):
+    tab_id1 = tabs_manager.add_tab("Users", Div("Content 1"))
+    tab_id2 = tabs_manager.add_tab("User2", Div("Content 2"))
+    
+    assert len(tabs_manager.get_state().tabs) == 2
+    assert tabs_manager.get_state().tabs_order == [tab_id1, tab_id2]
+    assert tabs_manager.get_state().active_tab == tab_id2
+
+
+class TestTabsManagerRender:
+  def test_i_can_render_when_no_tabs(self, tabs_manager):
+    res = tabs_manager.render()
+    
+    expected = Div(
+      Div(NoChildren(), id=f"{tabs_manager.get_id()}-header"),
+      Div(id=f"{tabs_manager.get_id()}-content"),
+      id=tabs_manager.get_id(),
+    )
+    
+    assert matches(res, expected)
+  
+  def test_i_can_render_when_one_tab(self, tabs_manager):
+    tabs_manager.add_tab("Users", Div("Content 1"))
+    res = tabs_manager.render()
+    
+    expected = Div(
+      Div(
+        Button(),
+        id=f"{tabs_manager.get_id()}-header"
+      ),
+      Div(
+        Div("Content 1")
+      ),
+      id=tabs_manager.get_id(),
+    )
+    assert matches(res, expected)
+  
+  def test_i_can_render_when_multiple_tabs(self, tabs_manager):
+    tabs_manager.add_tab("Users1", Div("Content 1"))
+    tabs_manager.add_tab("Users2", Div("Content 2"))
+    tabs_manager.add_tab("Users3", Div("Content 3"))
+    res = tabs_manager.render()
+    
+    expected = Div(
+      Div(
+        Button(),
+        Button(),
+        Button(),
+        id=f"{tabs_manager.get_id()}-header"
+      ),
+      Div(
+        Div("Content 3")
+      ),
+      id=tabs_manager.get_id(),
+    )
+    assert matches(res, expected)

tests/core/test_db_object.py

@@ -70,7 +70,25 @@ def test_i_can_init_from_dataclass(session, db_manager):
   assert len(history) == 1
 
 
-def test_i_can_init_from_db(session, db_manager):
+def test_i_can_init_from_db_with(session, db_manager):
+  class DummyObject(DbObject):
+    def __init__(self, sess: dict):
+      super().__init__(sess, "DummyObject", db_manager)
+      
+      with self.initializing():
+        self.value: str = "hello"
+        self.number: int = 42
+  
+  # insert other values in db
+  db_manager.save("DummyObject", {"value": "other_value", "number": 34})
+  
+  dummy = DummyObject(session)
+  
+  assert dummy.value == "other_value"
+  assert dummy.number == 34
+
+
+def test_i_can_init_from_db_with_dataclass(session, db_manager):
   @dataclass
   class DummyObject(DbObject):
     def __init__(self, sess: dict):

tests/testclient/test_matches.py

@@ -3,7 +3,7 @@ from fastcore.basics import NotStr
 from fasthtml.components import *
 
 from myfasthtml.test.matcher import matches, StartsWith, Contains, DoesNotContain, Empty, DoNotCheck, ErrorOutput, \
-  ErrorComparisonOutput, AttributeForbidden, AnyValue
+  ErrorComparisonOutput, AttributeForbidden, AnyValue, NoChildren
 from myfasthtml.test.testclient import MyFT
 
 
@@ -24,6 +24,8 @@ from myfasthtml.test.testclient import MyFT
     ([Div(), Span()], DoNotCheck()),
     (NotStr("123456"), NotStr("123")),  # for NotStr, only the beginning is checked
     (Div(), Div(Empty())),
+    (Div(), Div(NoChildren())),
+    (Div(attr1="value"), Div(NoChildren())),
     (Div(attr1="value1"), Div(AttributeForbidden("attr2"))),
     (Div(123), Div(123)),
     (Div(Span(123)), Div(Span(123))),
@@ -54,6 +56,7 @@ def test_i_can_match(actual, expected):
     (Div(), Div(attr1=AnyValue()), "'attr1' is not found in Actual"),
     (NotStr("456"), NotStr("123"), "Notstr values are different"),
     (Div(attr="value"), Div(Empty()), "The condition 'Empty()' is not satisfied"),
+    (Div(Span()), Div(NoChildren()), "The condition 'NoChildren()' is not satisfied"),
     (Div(120), Div(Empty()), "The condition 'Empty()' is not satisfied"),
     (Div(Span()), Div(Empty()), "The condition 'Empty()' is not satisfied"),
     (Div(), Div(Span()), "Actual is lesser than expected"),
@@ -203,6 +206,7 @@ def test_i_can_output_error_child_element():
                                  ')',
                                  ]
 
+
 def test_i_can_output_error_child_element_text():
   """I can display error when the children is not a FT"""
   elt = Div("Hello world", Div(id="child_1"), Div(id="child_2"), attr1="value1")
@@ -217,6 +221,7 @@ def test_i_can_output_error_child_element_text():
                                  ')',
                                  ]
 
+
 def test_i_can_output_error_child_element_indicating_sub_children():
   elt = Div(P(id="p_id"), Div(Div(id="child_2"), id="child_1"), attr1="value1")
   expected = elt