sing flow to check if a form submission exists in list, if not create, if so update

[Snazzybec]

Hi

I am a failrly new user of flow and have been enjoying the experience.

I am now wishing to get a bit more advanced with my flow. 

I have a form where flow inputs the submission into a sharepoint list.  I wish to use the condition to check of the get items output is 0, if so create new, if not update

I have tried using the below condition

length(body('Get_items')?['value']) - is equal to - 0 but this fails as the expression builder doesn't recognise it. 

Any assistance would be greatly appreciated

my current flow is attachedcurrent flow

Sam

[ChristianAbata · Accepted solution]

@Snazzybec  please create a compose action an inside add this string(length(body('Get_items')?['value'])) then use the output of compose to compare if is equals to 0.

[Snazzybec · Accepted solution]

thank you so much Christian, worked a treat

learnig fast

very much appreciate sharing the knowledge, hopefully I can pass it on

Sam