garrensmith opened a new issue #126: [RFC] Implement Partitions api URL: https://github.com/apache/couchdb-nano/issues/126 We are currently adding partition support to CouchDB https://github.com/apache/couchdb/pull/1605 This document details how I think the api for partitions should work for nano. Partitions allow a user to store related documents into a `partition` within CouchDB. Using the new partition endpoints this would then allow a user to query only documents in a specific partition. This leads to much faster query time as CouchDB only needs to fetch the documents from a subset of the shards for a db. To store a document in a partition a user prefixes an id with the partition name e.g `{_id: "partition1:my-doc", "field": "one"}` and `{_id: "partition2:my-doc", "field": "one"}`. Then using a tradional view to query the document you would use these endpoints: Map/Reduce: `/my-db/_partition/partition1/_design/my-view` And for Mango: `/my-db/_partition/partition1/_find` The idea around partitions, which I've hopefully conveyed really quickly above, is that data in a partition is quite separate and when a database is partitioned a user would work with each partition separately. I would like to reflect that kind of thinking in the api. So I propose that we would add a new function called `partition` which accepts a partition name and returns an object for you to query a specific partition. Hopefully the below example explains it. ```js await nano.db.create('db1', {partition: true}); const db = nano.use('db1'); await db.insert({ views: { aview: { map: "function(doc) {\n if (doc.group) {\n emit([doc.some, doc.group], 1);\n }\n}", reduce: "_count" } } } }, _design/example-query); db.insert({some: "field"}, 'partition1:doc1'); db.insert({some: "field2"}, 'partition1:doc2'); db. // This goes in partition 2 db.insert({some: "field2"}, 'partition2:doc1'); const partition1 = db.partition('partition1'); // This will only return doc with id `partition1:doc1` const docs = await partition1.find({ selector: { some: "field" } }); const docs2 = await partition1.view("example-query", "aview", {include_docs: true}); const partition2 = db.partition('partition2'); // A view can be used for each partition const docsFromPartition2 = await partition1.view("example-query", "aview", {include_docs: true}); ``` The new partition object would support all the `.find` and `.view` options to query with and internally would remember the name of the partition to use when querying. Currently we don't support _all_docs or changes.
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