Write Or Create Dynamic Variable is a ProtoFlux node that is able to create or find previously created dynamic variables under a slot. For more info on Dynamic Variables, see Dynamic Variables. This node will only attach the variable if Path were to be used on the slot it's attaching to would be able to bind. Otherwise the dynamic variable will not be created and it will impulse OnFailed.
For an example, if you are reading a gigantic string of data from an API like a blog post, and it gives you something like:
{
"date":"4/5/2020",
"poster":"josh",
"text":"I caught a fish",
"comments":{
"898dw3juez":{
"poster":"Jared",
"text":"This is cool!"
}
}
}
assuming you have already read this with protoflux reliably, how would you store this into a data you could read? Well using create or write dynamic variables, you can create a dynamic variable list by having a dynamic variable space named PostViewer and then write a bunch of variables. The variables for the above data could be written as follows:
PostViewer/Post.DatePostViewer/Post.PosterPostViewer/Post.TextPostViewer/Comments.898dw3juez.posterPostViewer/Comments.898dw3juez.text
then using Read Dynamic Variable this information can be read. Note the dots allow the variables to follow the allows naming schema but act as separators for different data under the variable space. Reading such data can be done by concatinating strings together with dots in between like one would do with a path and slashes.
Inputs
Target (Slot)
The slot to search for a dynamic variable space from to put the variable into
Path (String)
The path for the created dynamic variable. To see how this influences attaching see the paragraph at the beginning of this page.
CreateDirectlyOnTarget (bool)
Whether to attach the new dynamic variable when created to the slot the dynamic variable space component is on (false) or directly on the slot specified on Target (true)
FindExisting (Bool)
If true, this will not create the dynamic variable component if there is already another component of the same path and type that can be read from at the given Target
Value (Generic)
Any type of value, reference, or object that the variable should store.
See also: #1254
Outputs
OnFound (Continuation)
Fires when * is fired and FindExisting is true and a variable already exists that can be read through Target
OnCreated (Continuation)
Fires when * is fired and a variable has been created because either FindExisting was false, or the variable didn't exist before. This will only create the variable if it can bind, which is explained on the Dynamic Variables page.
OnFailed (Continuation)
Fires when * is fired and the variable would not able to bind when created at Target. The variable was not created when this impulses.