Pass Fluid variable to TypoScript - typo3

Question

I want to pass a variable (uid of category) in Fluid to a TypoScript :
<f:cObject typoscriptObjectPath="lib.testFluid" data="{setting.myvar}/>
Then i want to use the var to get all content elements in folder with pid 942 and the category {setting.myvar}
lib.testFluid = COA
lib.testFluid = CONTENT
lib.testFluid {
table = tt_content
select {
pidInList = 942
where = selected_categories = |
}
}
This does not work, it creates an MySql syntax error. I also tried using current = 1 instead of the where clause without success. I looked at post TYPO3: pass variable to typoscript via cObject? and I can recreate it but it does not work with my script. (TYPO3 8)
If i use
...
where = selected_categories = 13
....
the scrip will succesfully display all CE with category 13. How do i make it work with a var?

Answer 1

could you try this:
<f:cObject typoscriptObjectPath="lib.testFluid" data="{myvar: setting.myvar}/>
lib.testFluid = CONTENT
lib.testFluid {
table = tt_content
select {
pidInList = 942
where.data = field:myvar
where.intval = 1
where.wrap = selected_categories=|
}
}
hard to test for me but it might work ...

Answer 2

I had to solve it once with markers. I couldn't find another simpler way. I give you a very general solution which you may adapt to your needs. For example you could set the pid value via a typoscript setting which is more elegant than to put it in the snippet code. Please try:
<f:cObject typoscriptObjectPath="lib.testFluid" data="{category: setting.myvar, catPid: 942}" currrentValueKey="category" />
The related TypoScript snippet:
lib.testFluid = COA
lib.testFluid {
10 = LOAD_REGISTER
10 {
category.cObject = TEXT
category.cObject.value.current = 1
catPid.cObject = TEXT
catPid.cObject.value.dataWrap = { field: catPid }
}
20 = CONTENT
20 {
table = tt_content
select {
pidInList.cObject = TEXT
pidInList.cObject.dataWrap = {REGISTER:catPid}
where = selected_categories=###category###
markers {
category.data = REGISTER:category
}
}
}
30 = RESTORE_REGISTER
}