Problem with graph.fromJSON()

[malomiquel]

Hello everyone,
I have a problem with the function graph.fromJSON() because when i try to import a graph with a json i have an error in my console that say: "Uncaught TypeError: ModelClass is not a constructor".
It's work with basics elements like standard.rectangl but not with my customs elements.

[jamesgeorgewilliams]

JointJS reads cell view definitions from the joint.shapes namespace by default. When it is looking for your custom shape, it likely cannot find it on this namespace.

You can read more about the types attribute in the types section in this article.
https://resources.jointjs.com/tutorial/ts-shape

Following the advice in the article above, you could assign this custom element to the joint.shapes namespace.

const BusH = joint.dia.Element.define('BusH', {
  // attributes
});

Object.assign(joint.shapes, { BusH });

const namespace = joint.shapes;

const graph = new dia.Graph({}, { cellNamespace: namespace });
const paper = new dia.Paper({
    cellViewNamespace: namespace
});

graph.fromJSON({ 
    cells: [
        { type: 'BusH'}, 
    ]
});