Generic Attributes for Packages

[rgrp]

As A

User

I Want To

Add arbitrary named attributes to packages (an attribute being a name, type, value triple).

Details

• We will do this using a dedicated (versioned) table associated to Package
• Do we allow multiple attributes of the same name?
  • For the present: No (since we will key by attribute name)
  • Could allow for single attribute but with multiple values using json list ...
• What types do we allow or do we just rely on JSON to take care of this?

Questions (Original)

• How complex is this to implement?
• What would an arbitrary user be able to edit? Possibilities:
  1. 'create new attribute' and setting the value (so name and type would be chosen from predefined list).
  2. 'create', setting of name and value (but not type -- type already set in predefined list)
• Could just use (machine) tags -- though this could be seen as a bit of a hack.
• Would solve having to create special file/url attributes (though I think that perhaps file stuff is important enough to merit first class support in the domain model -- though, that said, since one won't want to have a file limit adding unlimited file support is very similar to unlimited attributes of arbitrary type).

[rgrp]

This is currently low priority and should only happen after move to vdm 0.2 (sqlalchemy etc).

[rgrp]

Started work on this using "extra" table. See r426.

[rgrp]

Making this versioned/revisioned turns out to be slightly more complex than anticipated (need a stateful associated list). So defer to 0.95

[rgrp]

Done in model in changeset:7f9b19d4d54a: "Implement a fully *versioned* PackageExtra? domain object in the model and attach to the Package object via a simple dict-like attribute named 'extras'.".

However still need to integrate into WUI which can only happen after conversion to formalchemy (ticket:76) is complete.

[rgrp]

Split out wui work in two new tickets ticket:124 (show) and ticket:125 (edit) and therefore marking this as done.