Pulling from list by expression

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question

Leo L6 asked Jan 6, '23 Jeanette F commented Jan 11, '23

Pulling from list by expression

Hello,

In the following sample model I created a situation where an item is pushed to a list with a label, the label then changes value as it moves to another queue. I then use a pull from list in the process flow to pull items of one specific value. However it pulls items that are the wrong value. It pulls items that are type 1 as opposed to only pulling items that are type 2. Attached the sample model:

listpulltest.fsm

Thanks in advance!

Software Version:

FlexSim 22.2.2

process flow list pulling from lists

listpulltest.fsm (36.0 KiB)

· 1

Jeanette F ♦♦ commented · Jan 11, 2023 at 09:36 PM

Hi @Leo L6, 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.

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0 ·

Answer 1 · 2023-01-06T20:53:39Z

Felix Möhlmann answered Jan 6, '23

When you use "value.item" FlexSim does not know what type of variable it is dealing with at that point, so it treats it as a Variant value. For Variants, type is a method to read their, well, type; whether they are a string, number, node or array. The item is a node for which "type" will return the number 2. So the list field takes on the value 2 for all tokens that are pushed to the list.

Either change the label name to something else that doesn't double as method for Variants or use one of the tow expressions below.

// Tell FlexSim that "item" is an object
value.item.as(Object).type

// Tell Flexsim specifically that "type" is a label node
value.item.labels["type"].value

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