On Mar 6, 2009, at 10:05 AM, Jason Smith wrote:
Hi, list.
While I am happy to be learning Couch for a new project, I am still
unsure about some tricks that I used with Django and Rails, such as
data migration:
For example, suppose I change my code and instead of using a string
timestamp in my documents, I would prefer a hash with "day",
"month", and "year" keys. When I deploy the new code into
production, obviously I want the data structures to change for all
existing documents.
Also keep in mind that another option is to "wrap" your json docs in a
language specific object for access, and you can use this layer to
this transformation at runtime and leave the data alone. As for
querying, couch allows you to emit values to a view (such as a d/m/y
hash) instead of the timestamp.
This has the obvious advantage of immediate deployment without first
having to do a migration. Which by the way, is very similar to how
attribs can be added or removed, without touching the actual data store.
-- troy
