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April 27, 2016 16:01
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Ensure array property value is unique when updating a doc
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| Venue.findOneAndUpdate( | |
| {venue: venueParam}, | |
| {$addToSet: {going: req.user.email}}, // $addToSet will only add if not already existing | |
| {safe: true, upsert: true}, | |
| function(err, existingVenue){ | |
| if(err) return err | |
| res.json(existingVenue) | |
| }) |
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