Question

I am not sure how I can design the following problem in CouchDB.

I have a logger web app that keeps track of how many items are in a warehouse. To simplify the problem we just need to know the total number items currently in warehouse and how long is each item stays in warehouse before it ships. Lets say the warehouse only have shoes but each shoe have different id and need to keep track by id.

MySQL schema looks like this

    id       name        date-in       data-out
    1        shoe       08/0/2010      null
    2        shoe       07/20/2010     08/01/2010


The output will be
    Number of shoe in warehouse:  1 
    Average time in warehouse:    14 days

Thanks

Answer 1

jhs’ answer is great, but I just wanted to add something:

To use the build-in reduce function for the avg calculation (_stats in your case), you have to use two “separate” views. But if your map-function is exactly the same, CouchDB will detect that and not generate a whole new index for that second view. This way you can have one map function feeding multiple reduce functions.