属性错误：对象没有属性“方法”

Question

我正在为搅拌机制作一个插件，我有一些包含绘图功能的数据类型。但是，当在两个特定类上调用这些函数时，它会抛出一个

AttributeError

Traceback (most recent call last):
  File "[REDACTED]/blender/4.2/scripts/addons/manifoldclothing/gen/GenPanel.py", line 17, in draw
    context.active_object.manifoldHuman.maleBody.draw(layout, context)
  File "[REDACTED]/blender/4.2/scripts/addons/manifoldclothing/data/FemaleBodyData.py", line 35, in draw
    self.neck.draw(box, context)
    ^^^^^^^^^^^^^^
AttributeError: 'LongLimbData' object has no attribute 'draw'

肢体数据：

import bpy

class LimbData(bpy.types.PropertyGroup):
    length: bpy.props.FloatProperty(name="Length")
    
    def draw(self, layout, context):
        layout.prop(self, "length")

长肢数据：

import bpy
from .LimbData import *

class LongLimbData(LimbData):
    thickness: bpy.props.FloatProperty(name="Thickness")

    def draw(self, layout, context):
        super().draw(layout, context)
        layout.prop(self, "thickness")

女性脊柱数据：

import bpy
from .LongLimbData import *

class FemaleSpineData(LongLimbData):
    lowerWidth: bpy.props.FloatProperty(name="Lower Width")
    upperWidth: bpy.props.FloatProperty(name="Upper Width")
    
    def draw(self, layout, context):
        super().draw(layout, context)
        layout.prop(self, "lowerWidth")
        layout.prop(self, "upperWidth")

女性身体数据：

import bpy
from .BodyData import *
from .FemaleChestData import *
from .FemaleHipData import *
from .FemaleThighData import *

class FemaleBodyData(BodyData):
    hips: bpy.props.PointerProperty(type=FemaleHipData)
    spine: bpy.props.PointerProperty(type=FemaleSpineData)
    chest: bpy.props.PointerProperty(type=FemaleChestData)
    neck: bpy.props.PointerProperty(type=LongLimbData)
    head: bpy.props.PointerProperty(type=WideLimbData)
    
    # OTHER FIELDS OMITTED
    
    def draw(self, layout, context):
        box = layout.box()
        self.hips.draw(box, context)
        self.spine.draw(box, context)
        self.chest.draw(box, context)
        self.neck.draw(box, context)
        self.head.draw(box, context)

        # OTHER DRAW CALLS OMITTED

但是

FemaleSpineData

（扩展了

LongLimbData

）可以很好地调用

super().draw(layout, context)

。它显示了

LongLimbData

定义的额外属性。

我现在已经确保缩进 4 个空格至少 5 次。我也尝试安装另一个版本的搅拌机但无济于事。

Answer 1

原来这是搅拌机的问题。当对现有属性组等进行子类化时，Blender 表现不佳。在这种情况下使用子类化的正确方法是使用混合类。

示例：

import bpy

class AbstractLimb:
    length: bpy.props.FloatProperty(name="Length", min=0.0)
    
    def Draw(self, layout, context):
        layout.prop(self, "length")

class LongLimb(AbstractLimb, bpy.types.PropertyGroup):
    radius: bpy.props.FloatProperty(name="Radius", min=0.0)
    
    def Draw(self, layout, context):
        super().Draw(layout, context)
        layout.prop(self, "radius")

class WideLimb(AbstractLimb, bpy.types.PropertyGroup):
    width: bpy.props.FloatProperty(name="Width", min=0.0)
    thickness: bpy.props.FloatProperty(name="Thickness", min=0.0)
    
    def Draw(self, layout, context):
        super().Draw(layout, context)
        layout.prop(self, "width")
        layout.prop(self, "thickness")

这没有给我带来任何错误，并且由 UI 正确绘制。