Hi Alex!
> I've been poking at how to construct views using the map reduce mechanics but
> am struggling with crafting a particular view. I have a set of data where
> documents have a category and I'd like to have a view that provides me with
> groups of documents based on their category. Is it possible to get the
> following three documents into the subsequent view (loosely defined)?
>
> * { "category": "A", "_id": "1" }
> * { "category": "A", "_id": "2" }
> * { "category": "B", "_id": "3" }
>
> View:
>
> { "A": [ { "category": "A", "_id": "1" }, { "category": "A", "_id": "2" } ],
> "B": [ { "category": "B", "_id": "3" } ] }
Don’t try to group category members in the “value” of a view row. Just emit a
row per doc with the category as key and request the key:
====
function () {
emit(doc.category, null) //the doc._id is automatically included
}
====
GET db/_design/:ddocname/_view/:viewname?key=‘A’
====
{
rows: [
{id: “1”, key: “A”, value: null},
{id: “2”, key: “A”, value: null}
]
}
Best, ingo
