Shopify flow condition - total items?

[BogdanOasa]

Is there a way to trigger an action based on how many items were in the order? 

I saw order.lineItems - but no size/quantity/totalCount or something similar

Thanks!

[ShikhaPant]

You can try liquid size function  for the same somthing like 

{% assign my_array = order.lineItems %}
{{ my_array.size }}

[BogdanOasa]

How would I do that in Shopify Flow? Is there a way to write your own logic in conditions?

[ShikhaPant]

If you ae using https://apps.shopify.com/flow?shpxid=e0ac7cd4-BC61-4197-FC05-8C44768EE440 app than you need to talk to shopify as they will best guide you , as it is there app. 

[G-L]

There is a Flow template that uses the correct value, and you might draw inspiration from it: Get notified about irregularly large order quantities.

It references the Order. currentSubtotalLineItemsQuantity field which should do what you look for.