How to count related items in child list

Question

I have two lists (Parrent and Child)

Parrent list (People) Child list: (Requirements) where is lookup column to People (list)

I need to count related items in chlid list for specified user and place this count number to parrent list item.

It is possible? (Maybe using workflow?)

Thanks a lot. Dominik Divák

Answer 1

You can create a number field in Parent list with initial value as 0. Attach SPD workflow on item created on child list.

When new item is created in child list, get lookup value. Based on lookup value , get the parent item. From parent item, get column count, increment it, and update the item again.