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pn.Param: value doesn't have a value set #5751

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MarcSkovMadsen opened this issue Oct 27, 2023 · 0 comments · May be fixed by #7639
Open

pn.Param: value doesn't have a value set #5751

MarcSkovMadsen opened this issue Oct 27, 2023 · 0 comments · May be fixed by #7639
Milestone
v1.6.0

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@MarcSkovMadsen
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I'm on Panel 1.3.0 and Param 2.0 trying to refresh my understanding of the Location object https://panel.holoviz.org/how_to/state/url.html

When I try to create a small app from the example I get bokeh.core.property.descriptors.UnsetValueError: Slider(id='p1105', ...).value doesn't have a value set.

import param
import panel as pn

class QueryExample(param.Parameterized):
    integer = param.Integer(default=None, bounds=(0, 10))
    string = param.String(default='A string')

query_example = QueryExample()

pn.state.location.sync(QueryExample(), {'integer': 'int', 'string': 'str'})

pn.Param(query_example).servable()
  File "/home/jovyan/repos/my-repo/.venv/lib/python3.10/site-packages/bokeh/core/has_props.py", line 599, in properties_with_values
    return self.query_properties_with_values(lambda prop: prop.serialized,
  File "/home/jovyan/repos/my-repo/.venv/lib/python3.10/site-packages/bokeh/core/has_props.py", line 656, in query_properties_with_values
    value = descriptor.get_value(self)
  File "/home/jovyan/repos/my-repo/.venv/lib/python3.10/site-packages/bokeh/core/property/descriptors.py", line 394, in get_value
    return self.__get__(obj, obj.__class__)
  File "/home/jovyan/repos/my-repo/.venv/lib/python3.10/site-packages/bokeh/core/property/descriptors.py", line 283, in __get__
    raise UnsetValueError(f"{obj}.{self.name} doesn't have a value set")
bokeh.core.property.descriptors.UnsetValueError: Slider(id='p1105', ...).value doesn't have a value set

If I change the integer value to 1 the example works.

I believe this is a bug and that pn.Param should pick another widget to support the None value.
@MarcSkovMadsen MarcSkovMadsen added TRIAGE Default label for untriaged issues type: bug and removed TRIAGE Default label for untriaged issues labels Oct 27, 2023
@MarcSkovMadsen MarcSkovMadsen added this to the next milestone Oct 27, 2023
@philippjfr philippjfr modified the milestones: next, v1.6.0 Jan 20, 2025
@philippjfr philippjfr linked a pull request Jan 21, 2025 that will close this issue
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Value none param mapping holoviz/panel
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@philippjfr @MarcSkovMadsen