Custom Code in Pull From List

Question

question

Sara R4 asked Aug 10 2021 at 5:14 PM Jeanette F commented Aug 16 2021 at 2:02 PM

Custom Code in Pull From List

I am trying to pull values from a global list by writing custom code in the "Query / Object / Array" field in the "Pull from List" activity in Process Flow. I started with a simple query "WHERE row = 1" (row is a Label Field on my global list) in order to confirm the syntax is correct for the List.PullResult statement. See attached snapshot of code from my model. I would like for the token entering the "Pull from List" activity to pull a value from the list based on this query and move to the next activity.

I clicked the check syntax option (check mark at the bottom left of the window) and it does not produce any errors. However, when running the simulation a token enters the "pull from list" activity and does not pull a value from the list where row = 1. In fact, it does not pull any value and does not progress to the next activity. Is my List.PullResult statement in the attached snapshot incorrect for the "Pull from List - Query" application? If so, what changes should be made to the statement?

I am unable to share the model for review. Thank you.

Software Version:

FlexSim 21.0.1

pull from list flexsim 21.0.1

pull-from-list-query.png (22.1 KiB)

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Answer 1 · 2021-08-10T19:00:54Z

Matthew Gillespie answered Aug 10 2021 at 7:00 PM Matthew Gillespie commented Aug 10 2021 at 7:45 PM

Since you are using the Pull from List process flow activity you don't need to use the List.pull() method. All you need to do is put "WHERE row = 1" directly into the Query / Object / Array field.

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Sara R4 commented · Aug 10 2021 at 7:37 PM

Thanks, Matt. I can do that for WHERE row = 1, but my goal is to eventually develop a more complex query that pulls from the list based on matching the puller token's name (which is a string) to a value (the specific field correlates to a label on the pushed token) on the list. There may be multiple items on the list with this value, so the token must also select an entry based on an assigned priority. I am new to FlexScript and SQL, so I was trying to start with a simple query to better understand how to build the logic. How would you recommend building this query?

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Matthew Gillespie ♦♦ Sara R4 commented · Aug 10 2021 at 7:45 PM

@Sara R4 You can use the Query / Object / Array field to dynamically write the query you want to use, something like:

return "WHERE " + token.name + " = " + token.SearchValue + "ORDER BY Priority";

So that if you have token1 with name "row" and a SearchValue label of 4 and token2 with name "col" and a SearchValue label of 15 then you would get these queries:

WHERE row = 4 ORDER BY Priority
WHERE col = 15 ORDER BY Priority

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