Set_attribute does not support custom classes?

Developers Ruby API
1

I want to save custom data of custom classes in model with set_attribute:

Sketchup.active_model.set_attribute("WW", "attr1", value)

If the “value” is number/string, it works well. But If value is a Hash, I get nil from get_attribute:

val = Sketchup.active_model.get_attribute("WW", "attr1", nil)

I cannot store Hash or custom data in attribute dictionary. Any mistake I made?

2

According to documentation, as a list of parameters here:
AttributeDictionary l#[]=-instance_method

value can be:
Boolean, Fixnum, Float, Length, nil, String, Time, Array, Geom::Point3d, Geom::Vector3d

I’m not sure if it is the case. Someone with more experience should confirm…

3

Thanks dezmo.

We save data as protobuf format. It is convinent to convert binary protobuf to custom classes and reverse. But not from/to json. I want to save the binary data in model. As the AttributeDictionary document, it is not possible.

4

Have you tried to store the binary data as a binary string in Ruby?