How to sort line items by item's properties with liquid

[nathdev]

How can I sort an array of line items (either from the cart, checkout or order objects) according to a property value that the item may have?

I've tried:

{% assign sorted_line_items = cart.items | sort: "properties.In Room" %}

and

{% assign sorted_line_items = cart.items | sort: "properties['In Room']" %}

But neither of them work. Simply no sort is applied.

The 'In Room' key has a string value e.g. 'Main Bathroom, 'Ensuite' etc.

Some line items also may not have this property at all.

Any suggestions?

[nathdev]

Anyone?