Getting parent model

[piernik]

Hi,

I want to create a plugin - placeholder for images with certain attributes. Here is what I have so far:

export default class InsertImagePathCommand extends Command {
    execute(pathParam, fullPath, dimentions) {
        this.editor.model.change(writer => {
            const img = new Image();
            img.src = fullPath;
            img.onload = () => {
                let dimentions= '';
                if (img.width === img.height) {
                    dimentions= 'square';
                } else if (img.height > img.width) {
                    dimentions = 'vertical';
                }
                this.editor.model.insertContent(writer.createElement('imagePathPreview', {path: pathParam, dimentions}));
            }
        });
    }

    refresh() {
        const model = this.editor.model;
        const selection = model.document.selection;
        const allowedIn = model.schema.findAllowedParent(selection.getFirstPosition(), 'imagePathPreview');

        this.isEnabled = allowedIn !== null;
    }
}

It is working, but now I want to set proper dimentions param dependent on a parent element. I'm guessing that I have to read it in model. But how to get parent element and its attributes? It doesn't work as HTML node co can You guide me?

Thanks!