Custom transformations for mappers

[MeltyBot]

Migrated from GitLab: https://gitlab.com/meltano/sdk/-/issues/355

Originally created by @vischous on 2022-03-29 20:34:48

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I'd like to add my own custom transformations in certain cases.

For example look at https://gitlab.com/vischous/singer-sdk/-/merge_requests/1/diffs#0a4f2ae2b6469688d540039ffa026037de097e8e_50_52

In this case I have a very specific transformation tied to Active Directory that I want to do. I'd like to be able to add these types of functions easily without having to add them to my own fork of the Singer SDK. This type of transformation is not usable to anyone outside of active directory so I don't think it'd ever make it into the SDK.

(Ignore all changes but mapper.py as there's some changes due to cookiecutter stuff with Windows that's completely unrelated to this)

[MeltyBot]

View 3 previous comments from the original issue on GitLab

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This has been marked as stale because it is unassigned, and has not had recent activity. It will be closed after 21 days if no further activity occurs. If this should never go stale, please add the evergreen label, or request that it be added.

[pnadolny13]

Still relevant

[stale[bot]]

This has been marked as stale because it is unassigned, and has not had recent activity. It will be closed after 21 days if no further activity occurs. If this should never go stale, please add the evergreen label, or request that it be added.