Advice using getChildCollectionSets

Question

Hi All -- I'm a newbie to the LR SDK and Lua and was hoping for a little advice using catalog:getChildCollectionSets.

First off, is there an easy way to get the length of the array returned? I know I can loop thru a For statement and also see that table:getn is not supported. Just wondering if there was an easier way.

Next - any advice or sample code calling this in LrTasks async statement. I was able to set this up and access the getChildCollectionSets returned array within the async loop, but not sure how to access it outside since it is async and timing/scope (i.e., testing when the async call is finished). A small snippet of code would be appreciated.

Thanks....Randy

areohbee · Answer

Hi Randy,1. local cs = catalog:getChildCollectionSets( ... ) if #cs > 2 then...i.e. use the pound/tic-tac-toe prefix operator to get the length of the array - standard lua stuff...I would recommend putting the code that uses the collection sets variable in the same task as the one that assigns it a value, so you dont have any "timing" problems.

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