Create a view to get multiple documents in CouchDb - couchdb

Question

CouchDb newbie here.
I have several documents in CouchDb with the same structure:
{
"_id": "1170140286",
"_rev": "1-79ffad4d4cbe24effc72f9ec519373ca",
"data": [
{
"photo": "link_of_photo1",
"userid": "34623",
"username": "guest-user1"
},
{
"photo": "link_of_photo2",
"userid": "34623",
"username": "guest-user1"
},
{
"photo": "link_of_photo3",
"userid": "34623",
"username": "guest-user1"
}
]
}
and
{
"_id": "43573458",
"_rev": "1-0ca5aa68590fcb58399fe059aa8fb881",
"data": [
{
"photo": "link_of_photo1",
"userid": "6334",
"username": "guest-user2"
},
{
"photo": "link_of_photo2",
"userid": "6334",
"username": "guest-user2"
},
{
"photo": "link_of_photo3",
"userid": "6334",
"username": "guest-user2"
}
]
}
I don't know whether what I want to do is possible, but i am trying to create a view that will combine the data elements of these documents into one single document:
[
{
"photo": "link_of_photo1",
"userid": "34623",
"username": "guest-user1"
},
{
"photo": "link_of_photo2",
"userid": "34623",
"username": "guest-user1"
},
{
"photo": "link_of_photo3",
"userid": "34623",
"username": "guest-user1"
},
{
"photo": "link_of_photo1",
"userid": "6334",
"username": "guest-user2"
},
{
"photo": "link_of_photo2",
"userid": "6334",
"username": "guest-user2"
},
{
"photo": "link_of_photo3",
"userid": "6334",
"username": "guest-user2"
}
]
I am pretty sure I haven't understood the logic of couchdb correctly, so any help is highly aprpeciated.

Answer 1

What you can get is a view result with all links included. It will be an array but will look a bit different to your mocked result structure. A view logic can look like (the key of the rows is not used in the example - maybe the user name or id is an useful value to put in):
function (doc) {
var data = doc.data
if (!data) return
for (var i = 0, link; link = data[i++];)
emit(null, link)
}
For the sake of completeness should be mentioned that there is a way to "merge all docs" server-side. The view result can be manipulated by a CouchDB list before the data will finally send back to the requester. But.it.is.not.recommended! Please take that seriously and don't try that out - its a massive performance issue and was never the goal of CouchDB to provide such uses-cases.

Answer 2

Please refer these links.
http://wiki.apache.org/couchdb/Introduction_to_CouchDB_views#Linked_documents
CouchDB "Join" two documents
combine multiple documents in a couchdb view
Sample Code:
function(doc){
if(doc.items)
doc.items.forEach(function(item){
emit(doc._id,{_id:item});
})
}
I hope these will solve your problem.