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POMongoDB map reduce with query
 

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    <p>I got a rather big MongoDB that I need to extract statistics from and I do this buy running a Map Reduce query.</p> <p>The problem is now that I need to narrow the query to use for example status: 'drafted" instead of using the whole collection.</p> <p>This is my Map/Reduce code (I am using Codeigniter): I tried to follow the last step in this query but I cannot get results so I think I add the syntax wrong: <a href="http://cookbook.mongodb.org/patterns/unique_items_map_reduce/" rel="noreferrer">http://cookbook.mongodb.org/patterns/unique_items_map_reduce/</a>.</p> <pre><code>$map = new MongoCode ("function() { day = Date.UTC(this.created_at.getFullYear(), this.created_at.getMonth(), this.created_at.getDate()); emit ({day: day, _id: this._id}, {created_at: this.created_at, count: 1}); }"); $reduce = new MongoCode ("function( key , values ) { var count = 0; values.forEach (function(v) { count += v['count']; }); return {count: count}; }"); $outer = $this-&gt;cimongo-&gt;command (array ( "mapreduce" =&gt; "documents", "map" =&gt; $map, "reduce" =&gt; $reduce, "out" =&gt; "stats_results" )); $map = new MongoCode ("function() { emit(this['_id']['day'], {count: 1}); }"); $reduce = new MongoCode ("function( key , values ) { var count = 0; values.forEach (function(v) { count += v['count']; }); return {count: count}; }"); $outer = $this-&gt;cimongo-&gt;command (array ( "mapreduce" =&gt; "stats_results", "map" =&gt; $map, "reduce" =&gt; $reduce, "out" =&gt; "stats_results_unique" )); </code></pre>
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    1. COWhat do you mean with "use status 'drafted'"? Do you want to avoid mapping the full table, or is it enough by only emitting keys with that status? I guess that what you want is to conditionally emit the result based on the status field.
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