How to display library overrides as checkboxes?

Custom properties can’t be displayed as checkboxes. I usually handle this by dynamically defining new API properties, like this:

setattr(bpy.types.Object, "myprop", BoolProperty(default=False))
setattr(ob, "myprop", False)
ob["myprop"] = False

and add the following line to the draw function:

self.layout.prop(ob, "myprop")

This works nicely in the blend file where the property was defined. However, when the collection is linked into another file and I make a library override, the checkbox is greyed out and says: Disabled: Can't edit this property from an override data block.

disabled

The first idea was to make the property overridable, i.e. to change the first line to:

setattr(bpy.types.Object, "myprop", BoolProperty(default=False, override={'LIBRARY_OVERRIDABLE'}))

and/or adding the line

ob.property_overridable_library_set('["myprop"]', True)

Alas, neither changes anything; the checkboxes are still greyed out in the linked file. Finally, setting the api property as overridable, like this

ob.property_overridable_library_set("myprop", True)

results in the error message

TypeError: Object.property_overridable_library_set("myprop") not found

What sort of works is to display the custom property rather than the api property, i.e. changing the draw function to:

self.layout.prop(ob, '["myprop"]')

But then the boolean properties are displayed as integers.

custom-props

Is there any way to override boolean properties and still display them as checkboxes?

It turns out that the following works.

setattr(bpy.types.Object, "myprop", BoolProperty(default=value))
setattr(ob, "myprop", value)
ob[prop] = value
ob.property_overridable_library_set('["myprop"]', True)

Note that the argument override={'LIBRARY_OVERRIDABLE'} is missing from the BoolProperty. If present, the next setattr will cause an error. To display checkboxes, draw the property with this line:

self.layout.prop(ob, "myprop")

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