add .mapReduce()

[haoxins]

No description provided.

[jonathanong]

what if i want to return the results immediately instead of through the collection?

[haoxins]

the logic of mongodb-native is

    // If we wish for no verbosity
    if(options['verbose'] == null || !options['verbose']) {
      return handleCallback(callback, err, collection);
    }
    // Return stats as third set of values
    handleCallback(callback, err, collection, stats);

so, how about

.mapReduce().map(map).reduce(reduce).verbose(true).then(function (stats) {})
.mapReduce().map(map).reduce(reduce).then(function (collection) {})

// or
.mapReduce().map(map).reduce(reduce).then(function (result) {
  // contain both `stats` and `collection` in result
  // result: { stats: stats, collection: collection }
  // or
  // just contain `collection` in `stats`
  // result: { processtime: ..., counts: ..., timing: ..., collection: collection }
})

[jonathanong]

ah. i didn't realize people actually looked at stats n stuff. i was thinking about inline: http://docs.mongodb.org/manual/reference/command/mapReduce/#output-inline

how do you use map/reduce? i've only ever used inline

[jonathanong]

i'm thinking of .out(collection, [options]) for writing to a collection http://docs.mongodb.org/manual/reference/command/mapReduce/#output-to-a-collection-with-an-action, then .inline() for writing it directly out. or just make inline default.

[haoxins]

😢 yes, inline for most cases.

updated.

[jonathanong]

cool. looks good. the only thing i'd add is .out('collectionName'). is that supported?

[haoxins]

yes, supported. maybe add a test is better.

[jonathanong]

32335bd thanks :D