[Pulp-dev] 'id' versus 'pulp_id' on Content

Jeff Ortel jortel at redhat.com
Tue Aug 7 16:47:40 UTC 2018

After long consideration, I have had a change of heart about this. I 
think.  In short, Pulp's data model has unique requirements that make it 
acceptable to deviate from common convention regarding ID as the PK.  
Mainly that the schema is extensible by plugin writers. Given the plugin 
architecture, I think it's reasonable to think of "core" fields like: 
ID, CREATED and LAST_MODIFIED as metadata. Although, the ID is harder to 
fit in this semantic, I think it's reasonable to do for consistency and 
to support the user query use-case re: content having an natural ID 
attribute.  Taking this further, the /href/ attributes /could/ be though 
of in the same category.

With this in mind, I'm thinking that the leading underscore (_) could be 
used broadly to denote /generated/ /or metadata/ fields and the 
following would be reasonable:



I highly value consistency so this applies to the entire schema.

This will introduce a few fairly odd things into the schema that I 
/suppose/ we can live with.

- Two fields on /some/ tables named (ID ,  _ID).  To mitigate confusion, 
we should serialize the *pk* and not*_id*. This will also be consistent 
with *pk* parameters passed in.
- I expect django will generate foreign key fields with double 
understores.  Eg: content__id

I'm still -1 for using a /pulp_/ prefix.


On 06/18/2018 01:15 PM, Daniel Alley wrote:
> I'm -1 on going the underscore idea, partly because of the 
> aforementioned confusion issue, but also partly because but I've 
> noticed that in our API, the "underscore" basically has a semantic 
> meeting of "href, [which is] generated on the fly, not stored in the db".
> Specifically:
>   * '_href'
>   * '_added_href'
>   * '_removed_href'
>   * '_content_href'
> So I think if we use a prefix, we should avoid using one that already 
> has a semantic meaning (I don't know whether we actually planned for 
> that to be the case, but I think it's a useful pattern / distinction 
> and I don't think we should mess with it).

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