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DataHub

Hi datahub team!
A couple of quick questions:
1. Is it possible to add constraints to entity fields (say, my CorpUser entity has an "email" field and I want it to be unique)?
2. Is it possible to add custom queries based on entity fields? (say, my CorpUser entity has "email" field and I want to query CorpUsers by email)?
Thanks!

1. You can leverage PDL's validation rule: <https://linkedin.github.io/rest.li/Validation-in-Rest_li>
2. Please read <https://github.com/linkedin/datahub/blob/master/docs/how/search-onboarding.md> and let us know if you still specific questions.

Thank you for the quick help! :slightly_smiling_face:

Hi <@UUPBTP50T>

What is the difference between `CorpUserEntity.pdl` and `CorpUser.pdl`? I mean what do each of these two represent?  Is it the following?
`CorpUserEntity.pdl` : Represents a node in graph database
`CorpUser.pdl`  :  Represents the return type of corp user query

Thanks!

Yup. And you'll also notice that `CorpUser.pdl` exists only in GMS not the common model folder because that's the only place it's used.