使用目标 object 作为四开块选项的输入时不一致

Question

I'm using targets to develop a pipeline. At the end of the pipeline I want to generate a report (Quarto markdown) in which some chunks get evaluated depending on objects created during the pipeline.

I can recover the pipeline object using

id <- tar_load(id)

and use the variable inside a chunk option:

#| echo !expr id
# do some stuff if id == TRUE

But, the eval option works differently.

#| eval: !expr id

# This should only get evaluated if id is TRUE
# but also raises an error when issuing tar_make()
# Error in eval(x, envir = envir) : object 'choice' not found
1 + 1 == 2

The chunk above gets evaluated correctly, that is, if result from expression is TRUE, it evaluates. But it also raises an error when issuing tar_make()

Error in eval(x, envir = envir) : object 'choice' not found

If I change the code chunk to #| eval: !expr tar_read(choice) #| eval: !expr tar_read(choice) , than no error is reported

Is this the expected behavior? Or is this an inconsistency?

Answer 1

Looks like it's a problem with Quarto , not targets

https://github.com/ropensci/tarchetypes/discussions/137#discussioncomment-4767907