attributes_for does not use initialize_with like the docs states it does about factory_bot

[mike-burns]

Good catch. The documentation is incorrect.

But since you bring it up I should ask: did you want attributes_for to use initialize_with? Is there a compelling use case for it?

[ezekg]

@mike-burns, I do similarly to what the reproduction script shows. Essentially, I want to not assign attributes if the sentinel value is present, because I'm tracking assignment of these attributes (where even nil is significant). Perhaps there's a better way, but using sentinel values was the easiest solution I came up with. But since attributes_for doesn't actually utilize initialize_with, I have to add superfluous attributes_for assignments to avoid assigning the sentinel values on the actual record (i.e. in this case, account and environment are superfluous for nested attributes since the associations have defaults that would kick in if the sentinel values weren't present). Here's a comment where I talk to myself about this (lol).