CouchDB "Join" two documents
I have two documents that looks a bit like so:
Doc
{
_id: AAA,
creator_id: ...,
data: ...
}
DataKey
{
_id: ...,
credits_left: 500,
times_used: 0,
data_id: AAA
}
What I want to do is create a view which would allow me to pass the DataKey id (key=DataKey _id) and get both the information of the DataKey and the Doc.
My attempt:
I first tried embedding the DataKey inside the Doc and used a map function like so:
function (doc)
{
if (doc.type == "Doc")
{
var ids = [];
for (var i in doc.keys)
ids.push(doc.keys[i]._id);
emit(ids, doc);
}
}
But i ran into two problems:
- There can be multiple DataKey's per Doc so using startkey=[idhere...] and endkey=[idhere..., {}] didn't work (only worked if the key happend to be the first one in the array).
- All the data keys need to be unique, and I would prefer not making a seperate document like {_id = datakey} to reserve the key.
Does anyone have ideas how I can accomplish this? Let me know if anything is unclear.
-----EDIT-----
I forgot to mention that in my applicati开发者_Go百科on I do not know what the Doc ID is, so I need to be able to search on the DataKey's ID.
I think what you want is
function (doc)
{
if (doc.type == "Doc")
{
emit([doc._id, 0], doc);
}
if(doc.type == "DataKey")
{
emit([doc.data_id, 1], doc);
}
}
Now, query the view with key=["AAA"]
and you will see a list of all docs. The first one will be the real "Doc" document. All the rest will be "DataKey" documents which reference the first doc.
This is a common technique, called CouchDB view collation.
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