How to structure data in Riak?

Question

I\'m trying to figure out how to model data in Riak. Let\'s say you are building something like a CMS with two features, news and products. You need to be able to store this

Answer 1

I'd create 2 buckets: news and products. Then I'd prefix keys in each bucket with client names. I'd probably also include dates in news keys for easy date ranging.

news/acme_2011-02-23_01
news/acme_2011-02-23_02
news/bigcorp_2011-02-21_01

And optionally prefix product names with category names

products/acme_blacksmithing_anvil
products/bigcorp_databases_oracle

Then in your map/reduce you could use key filtering:

// BigCorp News items
{
  "inputs":{
     "bucket":"news",
     "key_filters":[["starts_with", "bigcorp"]]
  }
  // ... rest of mapreduce job
}

// Acme Blacksmithing items
{
  "inputs":{
     "bucket":"products",
     "key_filters":[["starts_with", "acme_blacksmithing"]]
  }
  // ... rest of mapreduce job
}

// News for all clients from Feb 12th to 19th
{
  "inputs":{
     "bucket":"news",
     "key_filters":[["tokenize", "_", 2],
                    ["between", "2011-02-12", "2011-02-19"]]
  }
  // ... rest of mapreduce job
}