Re: 'Grouping' documents so that a set of documents is passed to the view function

[Daniel Trümper]

Hi,

I am somewhat new to CouchDB but have been doing some stuff with it and this is my first post to the list so pardon if I am wrong :)

It would be really cool if there were some way to pass all the docs with a value of 1 for group_key to a single map function call, so I could do computation across those related documents and emit the results ... I'm just using the magic group_key attribute as an example, if such a feature were to actually be made I'd think you'd define a javascript function which returned a single groupping k to exist I

I think this is what the reduce function is for. In your map function you could do something like this:

function(doc) {
  if( doc.group_key == 1 ) {
    emit( null, doc.data );
  }
}



function(keys, values, rereduce) {
  // do computations with all values
}

Daniel

An in the reduce function you have the values to do the computation with:

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