RE: [binarycloud-dev] entity history

[<bin...@li...>]

Hi Alex,

this is a *very* useful feauture we should implement.

Andi




>I was looking at a sourceforge support request (mine, actually, the one
>about reply-to on this list)
>
>and a relatively simple means of getting 'entity change histories' to work
>within the system occurred to me:
>
>a top-level tag in the entity definition:
>
>    <entity:history>true</entity:history>
>
>what would that do?
>
>    -When you generate metabase xml schemas, _two_ schemas would
>be created,
>one with the name of the entity: "furbees" and another: "furbees_history"
>    -furbees_history would contain the same fields as furbees, with the
>addition of two important fields:
>        -history_id
>        -history_timestamp
>
>With those two tables, it would be _relatively_ easy to implement a
>GetByHistory() method in EntityManager, which would trickle down to the
>correct Query to furbees_history through QueryManager..
>
>that's easy to deal with for applications like bugtrackers, support
>requests, etc...
>
>so you could ask for the 'current copy' of the entity, or one of the copies
>by id or timestamp, or all but the current, or all.. etc.
>
>something where you have a set of fields but need to maintain the same key
>id.