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Refactored Binding for better concern consideration

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This commit is contained in:
Kodjo Sossouvi
2025-11-02 18:46:44 +01:00
parent 7553c28f8e
commit 9696e67910
7 changed files with 459 additions and 84 deletions
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35
src/myfasthtml/controls/helpers.py
View File

@@ -1,8 +1,8 @@
from fasthtml.components import *
from myfasthtml.core.bindings import Binding
from myfasthtml.core.bindings import Binding, BooleanConverter, DetectionMode, UpdateMode
from myfasthtml.core.commands import Command
from myfasthtml.core.utils import merge_classes, get_default_ft_attr
from myfasthtml.core.utils import merge_classes, get_default_ft_attr, is_checkbox
class mk:
@@ -37,17 +37,28 @@ class mk:
@staticmethod
def manage_binding(ft, binding: Binding):
if binding:
if ft.tag in ["input"]:
# update the component to post on the correct route input and forms only
htmx = binding.get_htmx_params()
ft.attrs |= htmx
# update the binding with the ft
ft_attr = binding.ft_attr or get_default_ft_attr(ft)
ft_name = ft.attrs.get("name")
binding.bind_ft(ft, ft_name, ft_attr) # force the ft
if not binding:
return ft
if ft.tag in ["input"]:
# update the component to post on the correct route input and forms only
htmx = binding.get_htmx_params()
ft.attrs |= htmx
# update the binding with the ft
ft_attr = binding.ft_attr or get_default_ft_attr(ft)
ft_name = ft.attrs.get("name")
if is_checkbox(ft):
data_converter = BooleanConverter()
detection_mode = DetectionMode.AttributePresence
update_mode = UpdateMode.AttributePresence
else:
data_converter = None
detection_mode = None
update_mode = None
binding.bind_ft(ft, ft_name, ft_attr, data_converter, detection_mode, update_mode) # force the ft
return ft
@staticmethod

186
src/myfasthtml/core/bindings.py
View File

@@ -1,10 +1,10 @@
import logging
import uuid
from enum import Enum
from typing import Optional
from typing import Optional, Any
from fasthtml.fastapp import fast_app
from myutils.observable import make_observable, bind, collect_return_values
from myutils.observable import make_observable, bind, collect_return_values, unbind
from myfasthtml.core.constants import Routes, ROUTE_ROOT
from myfasthtml.core.utils import get_default_attr
@@ -105,44 +105,34 @@ class BooleanConverter(DataConverter):
class Binding:
def __init__(self, data,
attr=None,
data_converter: DataConverter = None,
ft=None,
ft_name=None,
ft_attr=None,
detection_mode: DetectionMode = DetectionMode.ValueChange,
update_mode: UpdateMode = UpdateMode.ValueChange):
def __init__(self, data: Any, attr: str = None):
"""
Creates a new binding object between a data object used as a pivot and an HTML element.
The same pivot object must be used for different bindings.
This will allow the binding between the HTML elements
:param data: object used as a pivot
:param attr: attribute of the data object
:param ft: HTML element to bind to
:param ft_name: name of the HTML element to bind to (send by the form)
:param ft_attr: value of the attribute to bind to (send by the form)
Creates a new binding object between a data object and an HTML element.
The binding is not active until bind_ft() is called.
Args:
data: Object used as a pivot
attr: Attribute of the data object to bind
"""
self.id = uuid.uuid4()
self.htmx_extra = {}
self.data = data
self.data_attr = attr or get_default_attr(data)
self.data_converter = data_converter
self.ft = self._safe_ft(ft)
self.ft_name = ft_name
self.ft_attr = ft_attr
self.detection_mode = detection_mode
self.update_mode = update_mode
self._detection = self._factory(detection_mode)
self._update = self._factory(update_mode)
# UI-related attributes (configured later via bind_ft)
self.ft = None
self.ft_name = None
self.ft_attr = None
self.data_converter = None
self.detection_mode = DetectionMode.ValueChange
self.update_mode = UpdateMode.ValueChange
make_observable(self.data)
bind(self.data, self.data_attr, self.notify)
# Strategy objects (configured later)
self._detection = None
self._update = None
# register the command
BindingsManager.register(self)
# Activation state
self._is_active = False
def bind_ft(self,
ft,
@@ -152,25 +142,43 @@ class Binding:
detection_mode: DetectionMode = None,
update_mode: UpdateMode = None):
"""
Update the elements to bind to
:param ft:
:param name:
:param attr:
:param data_converter:
:param detection_mode:
:param update_mode:
:return:
Configure the UI element and activate the binding.
Args:
ft: HTML element to bind to
name: Name of the HTML element (sent by the form)
attr: Attribute of the HTML element to bind to
data_converter: Optional converter for data transformation
detection_mode: How to detect changes from UI
update_mode: How to update the UI element
Returns:
self for method chaining
"""
# Deactivate if already active
if self._is_active:
self.deactivate()
# Configure UI elements
self.ft = self._safe_ft(ft)
self.ft_name = name
self.ft_attr = attr or self.ft_attr
self.data_converter = data_converter or self.data_converter
self.detection_mode = detection_mode or self.detection_mode
self.update_mode = update_mode or self.update_mode
self.ft_attr = attr
# Update optional parameters if provided
if data_converter is not None:
self.data_converter = data_converter
if detection_mode is not None:
self.detection_mode = detection_mode
if update_mode is not None:
self.update_mode = update_mode
# Create strategy objects
self._detection = self._factory(self.detection_mode)
self._update = self._factory(self.update_mode)
# Activate the binding
self.activate()
return self
def get_htmx_params(self):
@@ -180,6 +188,21 @@ class Binding:
}
def notify(self, old, new):
"""
Callback when the data attribute changes.
Updates the UI element accordingly.
Args:
old: Previous value
new: New value
Returns:
Updated ft element
"""
if not self._is_active:
logger.warning(f"Binding '{self.id}' received notification but is not active")
return None
logger.debug(f"Binding '{self.id}': Changing from '{old}' to '{new}'")
self.ft = self._update.update(self.ft, self.ft_name, self.ft_attr, old, new)
@@ -198,6 +221,53 @@ class Binding:
logger.debug(f"Nothing to trigger in {values}.")
return None
def activate(self):
"""
Activate the binding by setting up observers and registering it.
Should only be called after the binding is fully configured.
Raises:
ValueError: If the binding is not fully configured
"""
if self._is_active:
logger.warning(f"Binding '{self.id}' is already active")
return
# Validate configuration
self._validate_configuration()
# Setup observable
make_observable(self.data)
bind(self.data, self.data_attr, self.notify)
# Register in manager
BindingsManager.register(self)
# Mark as active
self._is_active = True
logger.debug(f"Binding '{self.id}' activated for {self.data_attr}")
def deactivate(self):
"""
Deactivate the binding by removing observers and unregistering it.
Can be called multiple times safely.
"""
if not self._is_active:
logger.debug(f"Binding '{self.id}' is not active, nothing to deactivate")
return
# Remove observer
unbind(self.data, self.data_attr, self.notify)
# Unregister from manager
BindingsManager.unregister(self.id)
# Mark as inactive
self._is_active = False
logger.debug(f"Binding '{self.id}' deactivated")
@staticmethod
def _safe_ft(ft):
"""
@@ -228,6 +298,25 @@ class Binding:
else:
raise ValueError(f"Invalid detection mode: {mode}")
def _validate_configuration(self):
"""
Validate that the binding is fully configured before activation.
Raises:
ValueError: If required configuration is missing
"""
if self.ft is None:
raise ValueError(f"Binding '{self.id}': ft element is required")
# if self.ft_name is None:
# raise ValueError(f"Binding '{self.id}': ft_name is required")
if self._detection is None:
raise ValueError(f"Binding '{self.id}': detection strategy not initialized")
if self._update is None:
raise ValueError(f"Binding '{self.id}': update strategy not initialized")
def htmx(self, trigger=None):
if trigger:
self.htmx_extra["hx-trigger"] = trigger
@@ -241,6 +330,17 @@ class BindingsManager:
def register(binding: Binding):
BindingsManager.bindings[str(binding.id)] = binding
@staticmethod
def unregister(binding_id: str):
"""
Unregister a binding from the manager.
Args:
binding_id: ID of the binding to unregister
"""
if str(binding_id) in BindingsManager.bindings:
del BindingsManager.bindings[str(binding_id)]
@staticmethod
def get_binding(binding_id: str) -> Optional[Binding]:
return BindingsManager.bindings.get(str(binding_id))

12
src/myfasthtml/core/utils.py
View File

@@ -1,9 +1,12 @@
import logging
from bs4 import Tag
from fastcore.xml import FT
from fasthtml.fastapp import fast_app
from starlette.routing import Mount, Route
from myfasthtml.core.constants import Routes, ROUTE_ROOT
from myfasthtml.test.MyFT import MyFT
utils_app, utils_rt = fast_app()
logger = logging.getLogger("Commands")
@@ -101,6 +104,15 @@ def get_default_attr(data):
return next(iter(all_attrs))
def is_checkbox(elt):
if isinstance(elt, (FT, MyFT)):
return elt.tag == "input" and elt.attrs.get("type", None) == "checkbox"
elif isinstance(elt, Tag):
return elt.name == "input" and elt.attrs.get("type", None) == "checkbox"
else:
return False
@utils_rt(Routes.Commands)
def post(session: str, c_id: str):
"""

9
src/myfasthtml/test/MyFT.py Normal file
View File

@@ -0,0 +1,9 @@
from dataclasses import dataclass, field
@dataclass
class MyFT:
tag: str
attrs: dict
children: list['MyFT'] = field(default_factory=list)
text: str | None = None

11
src/myfasthtml/test/testclient.py
View File

@@ -1,7 +1,5 @@
import dataclasses
import json
import uuid
from dataclasses import dataclass
from typing import Self
from bs4 import BeautifulSoup, Tag
@@ -11,6 +9,7 @@ from starlette.responses import Response
from starlette.testclient import TestClient
from myfasthtml.core.utils import mount_utils
from myfasthtml.test.MyFT import MyFT
verbs = {
'hx_get': 'GET',
@@ -21,14 +20,6 @@ verbs = {
}
@dataclass
class MyFT:
tag: str
attrs: dict
children: list['MyFT'] = dataclasses.field(default_factory=list)
text: str | None = None
class TestableElement:
"""
Represents an HTML element that can be interacted with in tests.

283
tests/core/test_bindings.py
View File

@@ -4,7 +4,13 @@ import pytest
from fasthtml.components import Label, Input
from myutils.observable import collect_return_values
from myfasthtml.core.bindings import BindingsManager, Binding, DetectionMode
from myfasthtml.core.bindings import (
BindingsManager,
Binding,
DetectionMode,
UpdateMode,
BooleanConverter
)
@dataclass
@@ -39,12 +45,15 @@ def test_i_can_register_a_binding_with_default_attr(data):
def test_i_can_retrieve_a_registered_binding(data):
binding = Binding(data)
elt = Label("hello", id="label_id")
binding = Binding(data).bind_ft(elt, name="label_name")
assert BindingsManager.get_binding(binding.id) is binding
def test_i_can_reset_bindings(data):
Binding(data)
elt = Label("hello", id="label_id")
Binding(data).bind_ft(elt, name="label_name")
assert len(BindingsManager.bindings) != 0
BindingsManager.reset()
@@ -53,7 +62,7 @@ def test_i_can_reset_bindings(data):
def test_i_can_bind_an_element_to_a_binding(data):
elt = Label("hello", id="label_id")
Binding(data, ft=elt)
Binding(data).bind_ft(elt, name="label_name")
data.value = "new value"
@@ -63,9 +72,9 @@ def test_i_can_bind_an_element_to_a_binding(data):
def test_i_can_bind_an_element_attr_to_a_binding(data):
elt = Input(value="somme value", id="input_id")
elt = Input(value="some value", id="input_id")
Binding(data, ft=elt, ft_attr="value")
Binding(data).bind_ft(elt, name="input_name", attr="value")
data.value = "new value"
@@ -78,13 +87,13 @@ def test_bound_element_has_an_id():
elt = Label("hello")
assert elt.attrs.get("id", None) is None
Binding(Data(), ft=elt)
Binding(Data()).bind_ft(elt, name="label_name")
assert elt.attrs.get("id", None) is not None
def test_i_can_collect_updates_values(data):
elt = Label("hello")
Binding(data, ft=elt)
Binding(data).bind_ft(elt, name="label_name")
data.value = "new value"
collected = collect_return_values(data)
@@ -98,7 +107,7 @@ def test_i_can_collect_updates_values(data):
def test_i_can_react_to_value_change(data):
elt = Input(name="input_elt", value="hello")
binding = Binding(data, ft=elt, ft_name="input_elt", ft_attr="value")
binding = Binding(data).bind_ft(elt, name="input_elt", attr="value")
res = binding.update({"input_elt": "new value"})
@@ -107,7 +116,7 @@ def test_i_can_react_to_value_change(data):
def test_i_do_not_react_to_other_value_change(data):
elt = Input(name="input_elt", value="hello")
binding = Binding(data, ft=elt, ft_name="input_elt", ft_attr="value")
binding = Binding(data).bind_ft(elt, name="input_elt", attr="value")
res = binding.update({"other_input_elt": "new value"})
@@ -116,8 +125,12 @@ def test_i_do_not_react_to_other_value_change(data):
def test_i_can_react_to_attr_presence(data):
elt = Input(name="input_elt", type="checkbox")
binding = Binding(data, ft=elt, ft_name="input_elt", ft_attr="checked",
detection_mode=DetectionMode.AttributePresence)
binding = Binding(data).bind_ft(
elt,
name="input_elt",
attr="checked",
detection_mode=DetectionMode.AttributePresence
)
res = binding.update({"checked": "true"})
@@ -126,9 +139,251 @@ def test_i_can_react_to_attr_presence(data):
def test_i_can_react_to_attr_non_presence(data):
elt = Input(name="input_elt", type="checkbox")
binding = Binding(data, ft=elt, ft_name="input_elt", ft_attr="checked",
detection_mode=DetectionMode.AttributePresence)
binding = Binding(data).bind_ft(
elt,
name="input_elt",
attr="checked",
detection_mode=DetectionMode.AttributePresence
)
res = binding.update({})
assert len(res) == 1
def test_i_can_create_a_binding_without_activation(data):
"""
A binding created without calling bind_ft should not be active.
"""
binding = Binding(data, "value")
assert binding._is_active is False
assert binding.ft is None
assert binding.ft_name is None
assert binding.ft_attr is None
assert BindingsManager.get_binding(binding.id) is None
def test_i_can_activate_binding_via_bind_ft(data):
"""
Calling bind_ft should automatically activate the binding.
"""
elt = Label("hello", id="label_id")
binding = Binding(data, "value")
binding.bind_ft(elt, name="label_name")
assert binding._is_active is True
assert binding.ft is elt
assert binding.ft_name == "label_name"
assert BindingsManager.get_binding(binding.id) is binding
def test_i_cannot_notify_when_not_active(data):
"""
A non-active binding should not update the UI when data changes.
"""
elt = Label("hello", id="label_id")
binding = Binding(data, "value")
binding.ft = elt
binding.ft_name = "label_name"
# Change data without activating the binding
result = binding.notify("old", "new")
assert result is None
assert elt.children[0] == "hello" # Should not have changed
def test_i_can_deactivate_a_binding(data):
"""
Deactivating a binding should clean up observers and unregister it.
"""
elt = Label("hello", id="label_id")
binding = Binding(data, "value").bind_ft(elt, name="label_name")
assert binding._is_active is True
assert BindingsManager.get_binding(binding.id) is binding
binding.deactivate()
assert binding._is_active is False
assert BindingsManager.get_binding(binding.id) is None
def test_i_can_reactivate_a_binding(data):
"""
After deactivation, a binding can be reactivated by calling bind_ft again.
"""
elt1 = Label("hello", id="label_id_1")
binding = Binding(data, "value").bind_ft(elt1, name="label_name_1")
binding.deactivate()
assert binding._is_active is False
elt2 = Label("world", id="label_id_2")
binding.bind_ft(elt2, name="label_name_2")
assert binding._is_active is True
assert binding.ft is elt2
assert binding.ft_name == "label_name_2"
def test_bind_ft_deactivates_before_reconfiguring(data):
"""
Calling bind_ft on an active binding should deactivate it first,
then reconfigure and reactivate.
"""
elt1 = Label("hello", id="label_id_1")
elt2 = Label("world", id="label_id_2")
binding = Binding(data, "value").bind_ft(elt1, name="label_name_1")
# Change data to verify old binding works
data.value = "updated"
assert elt1.children[0] == "updated"
# Reconfigure with new element
binding.bind_ft(elt2, name="label_name_2")
# Change data again
data.value = "final"
# Old element should not update
assert elt1.children[0] == "updated"
# New element should update
assert elt2.children[0] == "final"
def test_deactivate_can_be_called_multiple_times(data):
"""
Calling deactivate multiple times should be safe (idempotent).
"""
elt = Label("hello", id="label_id")
binding = Binding(data, "value").bind_ft(elt, name="label_name")
binding.deactivate()
binding.deactivate() # Should not raise an error
binding.deactivate() # Should not raise an error
assert binding._is_active is False
def test_i_cannot_activate_without_configuration(data):
"""
Calling activate directly without proper configuration should raise ValueError.
"""
binding = Binding(data, "value")
with pytest.raises(ValueError, match="ft element is required"):
binding.activate()
def test_activation_validates_ft_name(data):
"""
Activation should fail if ft_name is not configured.
"""
elt = Label("hello", id="label_id")
binding = Binding(data, "value")
binding.ft = elt
binding._detection = binding._factory(DetectionMode.ValueChange)
binding._update = binding._factory(UpdateMode.ValueChange)
with pytest.raises(ValueError, match="ft_name is required"):
binding.activate()
def test_activation_validates_strategies(data):
"""
Activation should fail if detection/update strategies are not initialized.
"""
elt = Label("hello", id="label_id")
binding = Binding(data, "value")
binding.ft = elt
binding.ft_name = "label_name"
with pytest.raises(ValueError, match="detection strategy not initialized"):
binding.activate()
def test_i_can_chain_bind_ft_calls(data):
"""
bind_ft should return self for method chaining.
"""
elt = Label("hello", id="label_id")
binding = Binding(data, "value").bind_ft(elt, name="label_name")
assert isinstance(binding, Binding)
assert binding._is_active is True
def test_bind_ft_updates_optional_parameters(data):
"""
bind_ft should update optional parameters if provided.
"""
elt = Input(name="input_elt", type="checkbox")
binding = Binding(data, "value")
binding.bind_ft(
elt,
name="input_elt",
attr="checked",
data_converter=BooleanConverter(),
detection_mode=DetectionMode.AttributePresence,
update_mode=UpdateMode.AttributePresence
)
assert binding.detection_mode == DetectionMode.AttributePresence
assert binding.update_mode == UpdateMode.AttributePresence
assert isinstance(binding.data_converter, BooleanConverter)
def test_deactivated_binding_does_not_update_on_data_change(data):
"""
After deactivation, changes to data should not update the UI element.
"""
elt = Label("hello", id="label_id")
binding = Binding(data, "value").bind_ft(elt, name="label_name")
# Verify it works when active
data.value = "first update"
assert elt.children[0] == "first update"
# Deactivate
binding.deactivate()
# Change data - element should NOT update
data.value = "second update"
assert elt.children[0] == "first update"
def test_multiple_bindings_can_coexist(data):
"""
Multiple bindings can be created and managed independently.
"""
elt1 = Label("hello", id="label_id_1")
elt2 = Input(value="world", id="input_id_2")
binding1 = Binding(data, "value").bind_ft(elt1, name="label_name")
binding2 = Binding(data, "value").bind_ft(elt2, name="input_name", attr="value")
assert len(BindingsManager.bindings) == 2
assert binding1._is_active is True
assert binding2._is_active is True
# Change data - both should update
data.value = "updated"
assert elt1.children[0] == "updated"
assert elt2.attrs["value"] == "updated"
# Deactivate one
binding1.deactivate()
assert len(BindingsManager.bindings) == 1
# Change data - only binding2 should update
data.value = "final"
assert elt1.children[0] == "updated" # Not changed
assert elt2.attrs["value"] == "final" # Changed

7
tests/test_integration.py
View File

@@ -69,7 +69,7 @@ class TestingBindings:
data = Data("hello world")
input_elt = Input(name="input_name")
label_elt = Label()
mk.manage_binding(input_elt, Binding(data, ft_attr="value"))
mk.manage_binding(input_elt, Binding(data))
mk.manage_binding(label_elt, Binding(data))
return input_elt, label_elt
@@ -85,10 +85,7 @@ class TestingBindings:
data = Data(True)
input_elt = Input(name="input_name", type="checkbox")
label_elt = Label()
mk.manage_binding(input_elt, Binding(data, ft_attr="checked",
detection_mode=DetectionMode.AttributePresence,
update_mode=UpdateMode.AttributePresence,
data_converter=BooleanConverter()))
mk.manage_binding(input_elt, Binding(data))
mk.manage_binding(label_elt, Binding(data))
return input_elt, label_elt