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mizvol/mongoAggregatePosts.js

Created April 21, 2017 10:03
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mongoAggregatePosts.js
db.allPosts.aggregate([
{$group: {_id: "$user.id", tags: {$addToSet: "$tags"}}},
{$unwind: "$tags"},
{$unwind: "$tags"},
{$group: {_id: "$_id", tags: {$addToSet: "$tags"}}},
{$out: "tags"}
])
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