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How to upsert a document in MongoDB .Net?


How to upsert a document in MongoDB .Net?

By : J_P
Date : November 22 2020, 02:59 PM
this will help You need to use the typed collection all the way down which means inserting an instance of CustomerModel, not a BsonDocument:
code :
await collection.ReplaceOneAsync(filter, customer);
var collection = database.GetCollection<BsonDocument>("customers");


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Mongodb upsert embedded document

Mongodb upsert embedded document


By : Pavel Badin
Date : March 29 2020, 07:55 AM
will help you I think what you want is the $addToSet command - that will push an element to an array only if it does not already exist. I've simplified your example a bit for brevity:
code :
db.meters.findOne()
{
    "_id" : ObjectId("4f8e95a718bc9c7da1e6511a"),
    "config" : {
        "someparam" : 4.5
    },
    "data" : [
        {
            "Meter" : 123456789,
        }
    ],
    "key" : "20120418_123456789"
}
db.meters.update({"key" : "20120418_123456789"}, {"$addToSet": {"data" : {"Meter" : 1234}}})
db.meters.findOne()
{
    "_id" : ObjectId("4f8e95a718bc9c7da1e6511a"),
    "config" : {
        "someparam" : 4.5
    },
    "data" : [
        {
            "Meter" : 123456789,
        },
        {
            "Meter" : 1234
        }
    ],
    "key" : "20120418_123456789"
}
MongoDB: upsert sub-document

MongoDB: upsert sub-document


By : bogbass
Date : March 29 2020, 07:55 AM
should help you out No there isn't really a better solution to this, so perhaps with an explanation.
Suppose you have a document in place that has the structure as you show:
code :
{ 
  "name": "foo", 
  "bars": [{ 
       "name": "qux", 
       "somefield": 1 
  }] 
}
db.foo.update(
    { "name": "foo", "bars.name": "qux" },
    { "$set": { "bars.$.somefield": 2 } },
    { "upsert": true }
)
db.foo.update(
    { "name": "foo", "bars.name": "xyz" },
    { "$set": { "bars.$.somefield": 2 } },
    { "upsert": true }
)
WriteResult({
    "nMatched" : 0,
    "nUpserted" : 0,
    "nModified" : 0,
    "writeError" : {
        "code" : 16836,
        "errmsg" : "The positional operator did not find the match needed from the query. Unexpanded update: bars.$.somefield"
    }
})
db.foo.update(
    { "name": "foo", "bars.name": "xyz" },
    { "$set": { "bars.$.somefield": 2 } }
)
WriteResult({ "nMatched" : 0, "nUpserted" : 0, "nModified" : 0 })
db.foo.update(
    { "name": "foo" },
    { "$push": { "bars": {
        "name": "xyz",
        "somefield": 2
    }}
)
How do I upsert a MongoDB document only in certain circumstances?

How do I upsert a MongoDB document only in certain circumstances?


By : user3744744
Date : March 29 2020, 07:55 AM
this will help Basically:
The user does not exists, create it with the current time as the "last update time". This could be done using a simple upset and $setOnInsert; The user already exists and need to be updated. This is a simple update.
code :
db.runCommand({
  update: 'users',
  updates: [
    { q: { name: 'bob' },
      u: { $setOnInsert: { updatedAt: now, updates: 0 }},
      upsert: true },
    { q: { name: 'bob', updatedAt: { $lt: now } },
      u: { $set: { updatedAt: now }, $inc: { updates: 1 } },
      upsert: false },
  ]
})
> var now = new Date()
> db.runCommand({   update: 'users',   updates: [     { q: { name: 'bob' },       u: { $setOnInsert: { updatedAt: now, updates: 0 }},       upsert: true },     { q: { name: 'bob', updatedAt: { $lt: now } },       u: { $set: { updatedAt: now }, $inc: { updates: 1 } },       upsert: false },   ] })
{
    "ok" : 1,
    "nModified" : 0,
    "n" : 1,
    "upserted" : [
        {
            "index" : 0,
            "_id" : ObjectId("556f672cd418ed1506eb2ca3")
        }
    ]
}
> var now = new Date()
> db.runCommand({   update: 'users',   updates: [     { q: { name: 'bob' },       u: { $setOnInsert: { updatedAt: now, updates: 0 }},       upsert: true },     { q: { name: 'bob', updatedAt: { $lt: now } },       u: { $set: { updatedAt: now }, $inc: { updates: 1 } },       upsert: false },   ] })
{ "ok" : 1, "nModified" : 1, "n" : 2 }
Mongodb upsert field in document

Mongodb upsert field in document


By : Ramu
Date : March 29 2020, 07:55 AM
Any of those help I have a document in the following form:
code :
db.collection.find({"_id":"value"}).forEach(
  function(doc){
    if(doc.hasOwnProperty('inventory'))
     {
       db.collection.update({"_id":doc._id},
       {"$push":{"inventory": "new value"}});
     }
   else
    {
       db.collection.update({"_id":doc._id},
       {"$set":{"inventory": new Array() }});
    }
  });
MongoDB: upsert sub document array

MongoDB: upsert sub document array


By : Jeffrey Swindel
Date : March 29 2020, 07:55 AM
Hope this helps Use the $ positional operator
For example:
code :
updateOne({ 
      "_id": ObjectId('1000'),
      "products._id": ObjectId('1002')
    },{
       $set: {"products.$.name": 'ProdBB' } // include other fields here
   });
);
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