Hi!
I'm quite new to CouchDB and map/reduce and played a little around with it.
Currently, I am trying to find pairs of two documents which fulfill a special
condition. E.g., consider the following documents in the store (_id and _rev
are left out): [{price: 1},{price: 5},{price: 9},{price: 1000}]
Now I would like to find all pair of documents, where (doc1.price + 4 ==
doc2.price). How can I express this in couchdb? I expect the following result:
[[{price: 1},{price: 5}], [{price: 5},{price:9}]]
My first try was:
map: function(doc){
emit(null, doc);
}
reduce: function(key, values){
for(var i in values){
for(var j in values){
if(values[i].price + 4 == values[j]) return [values[i], values[j]];
}
}
}
But then I recognized the rereduce property in CouchDB and that the values of
the reduce funtion can be only intermediate results. So how can I express what
I want to do in map reduce?
Thx!
Boris
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