Created
March 20, 2015 08:08
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Mongoid map reduce find duplicate email
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| map = %Q{function() { emit(this.email, 1); }} | |
| reduce = %Q{function(k, v) {return Array.sum(v);}} | |
| User.all.map_reduce(map, reduce).out(inline: true).map{|u| | |
| u["_id"] if u["value"] != 1.0 | |
| }.compact |
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