Let's say I have an Entity with a custom integer field added. Let's call the field Global Total (field_global_total)
On some event, I want to
get the existing value of that field and store it in a variable
get the value of another integer field (from another entity) and store that in a variable
add the two variables together
save that sum as the new value of "Global Total"
Ultimately I want to learn this generically so I can build more complex rules. For example, I don't know how to create a variable, but when I do, is that variable confined to the scope of that rule? Or can I pass it around to any subsequent rule? And if I can, how do I access it in other rules?
But if it helps, this is my specific use case.
My goal is, in Commerce, I have Product A. Product A has an integer field called "Total Sold to Date" (field_total_sold_to_date). Let's say that the current value is 15.
Event
Item is added to cart. Quantity field is updated to 20. User checks out.
Condition
Entity has field
Action
-- get Quantity value and store it in variable 'this_quantity'
-- get Total_sold_to_date value and store it in 'ttstd'
-- add the two together
-- save the entity so that the sum is the new value of the product's field_total_sold_to_date value
Please note that I do not want to use an extra module like compute fields or math or commerce reports. I feel like this can be done out of the box. Thanks!
