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If webpacker is setup in your RoR project, then you can simply use the react_component function from react-rails in the same way we would add ruby code to the haml file.

Ex:

working example (if somebody else should although need it)

Declare the timelines at the top within the component,

BaseContentMixin should not use a field called content_type because that will clash with the similarly named field in TemplateView which is ultimately used to set the response's Content-Type header. When you override that to 'custom', you end up confusing the browser because that's not a valid content type.

Replace the equal (=) with a (-)

Change this to

Since the parent component Clock is being rerendered every second, the Child component also gets rerendered too. This is because Clock rerenders completely whenever a state update happens, as the clock moving forward a second. Thus, since Child is part of Clock, it too get rerendered.

The quote from the React documentation is correct:

shouldComponentUpdate() is invoked before rendering when new props or state are being received.

Whenever Child is rerendered, the prop test is received again and again after every second the Clock is rerendered. That's what 'new props or state' is referring to here, not necessarily that it's getting different, unique props. Thus, shouldComponentUpdate is called every time the Child is rerendered because the prop test is given to the Child on each rerender.