Storage system queryItems behavior

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Shinya O asked May 30, '24 Jeanette F commented Jun 17, '24

Storage system queryItems behavior

Hi,

The code below should return the number of all items in storage, but the behavior seems to change when "Find Item" query in the processing flow is executed with "Any Item".

return Storage.system.queryItems("").length;

In this model, initially 10 items enter Bay=1, at 10 seconds it searches for one item with Bay=1, and at 20 seconds it searches for one arbitrary item.

After that, When I run that code I expect it to return 8, but it returns 1.

Is my understanding correct?

Thanks in advance.queryItems.fsm

Software Version:

FlexSim 24.1.0

storage system finditem queryitems

1717036012103.png (257.0 KiB)

queryitems.fsm (41.8 KiB)

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Jeanette F ♦♦ commented · Jun 17 at 04:40 PM

Hi @Shinya O, was Felix Möhlmann's answer helpful? If so, please click the "Accept" button at the bottom of their answer. Or if you still have questions, add a comment and we'll continue the conversation.

If we haven't heard back from you within 3 business days we'll auto-accept an answer, but you can always comment back to reopen your question.

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Answer 1 · 2024-05-30T06:30:37Z

Felix Möhlmann answered May 30, '24

Looks like the same issue described in the post linked below.

Question about Storage.system.queryItems - FlexSim Community

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Shinya O commented · May 30 at 07:48 AM

Thank you for your information.

The following code replicates the issue without using the Find Item activity as you have mentioned.

Storage.system.queryItems("", Storage.QueryFlags.Limit1);
return Storage.system.queryItems("").length;

If an empty query string is bad, I would like to avoid them as follows until this bug is fixed.

Storage.system.queryItems(" ", Storage.QueryFlags.Limit1);
return Storage.system.queryItems("").length;

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Felix Möhlmann Shinya O commented · May 30 at 08:20 AM

One of our clients actually encountered this issue recently and we concluded that this might be an issue with caching queries. It's not necessarily the empty query string that is the problem. Any query string that was previously used in findItem() (either in code directly or the Find Item activity) will return only a single slotItem.

queryitems_1.fsm

Your workaround of using a single space in the query will work, as long as this same string is never used in findItem(). (But there isn't really any reason to do so, so I don't expect any problems.)

Since you provided a solution to the problem, it would be good if you could convert your comment to an answer an accept it.

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queryitems-1.fsm (41.7 KiB)

Shinya O Felix Möhlmann commented · May 30 at 09:18 AM

This workaround is not practical for large scale models because there is no way to know which query strings have been cached. I would be grateful if there is a better way...

Hello @Jason Lightfoot , is this issue on the dev list?

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