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oh just realized it's not possible to extend targe...
# general
f
oh just realized it's not possible to extend target's fields with whatever has been set by default? 🧵
✅ 1
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# in the parent directory
__defaults__(extend=True, all=dict(tags=["global-tag"]))
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# in the child directory
python_sources(
    name="lib",
    tags=["local-tag"],
)
when doing 
./pants peek
, I can see that 
python_sources
only has 
["local-tag"]
, not 
["global-tag", "local-tag"]
one may want. I am aware of the options syntax 
--scope-listopt="+[3,4]"
, but you can't use this on targets, can you? Is there a way to extend fields preserving whatever the default has been assigned by the parent(s)?
c
Using 
__defaults__
there is no merging going on, but you may preserve rather than replace defaults, using the 
extend=True
keyword. See near the end of this section: https://www.pantsbuild.org/docs/targets#field-default-values Using only targets, you can use
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python_sources(sources=["custom.py", *python_sources.sources.default
From: https://github.com/pantsbuild/pants/pull/17649 N.b. We’ve not yet updated the docs with that last one.. 😬 In summary, I’ve not yet come up with a solution for what you want here.. 😕
I realize that it would be cool if 
python_sources.tags.default
reflected the current state of 
__defaults__
too..
as that would allow you to get what you want 🙂
f
oh cool, thanks, Andreas. It feels somewhat like a basic feature that many people would want. I shall probably raise an issue explaining what one may want and possible use cases.
👍 1
c
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