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    Upvotes91Top Answeredited Nov 6, 2017 at 13:00

    You can add a query to your update statement:

    db.foo.update({'title.de': {$exists : false}}, {$set: {'title.de': ''}})

    Update

    For your modified question my solution looks like this - would that work for you? (If not, why?)

    db.foo.update({site_id: 'xxx', 'title.de': {$exists : false}}, {$set: {'title.de': ''}, {multi: true})
    db.foo.update({site_id: 'xxx', 'content.de': {$exists : false}}, {$set: {'content.de': ''}}, {multi: true})
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  3. Stack Overflow
    https://stackoverflow.com/questions/24824657

    How do I update MongoDB document fields only if they don't exist?

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  4. MongoDB
    https://www.mongodb.com/.../operator/update/set

    $set - MongoDB Manual v7.0

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  6. Statology
    https://www.statology.org/mongodb-insert-if-not-exists

    MongoDB: How to Insert if Not Exists - Statology

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  7. Stack Overflow
    https://stackoverflow.com/questions/48220677

    Mongodb how to insert ONLY if does not exists (no update if exist)?

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  8. Sling Academy
    https://www.slingacademy.com/article/mongodb...

    MongoDB Upsert: Update if exists, otherwise insert new record

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  9. MongoDB
    https://www.mongodb.com/.../operator/query/exists

    $exists - MongoDB Manual v7.0

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  10. People also ask
    How to insert if not exists in MongoDB?
    Using bulkWrite () method to insert if not exists in MongoDB The MongoDB bulkWrite() method updates or inserts if not exists multiple docuemnts. Here the bulkWrite operations are specified where the updateOne method updates at most one document that matches the given filter criteria.

    MongoDB insert if not exists - Spark By {Examples}

    sparkbyexamples.com
    What is the difference between $exists and $in operator in MongoDB?
    The $exists operator matches documents that contain or do not contain a specified field, including documents where the field value is null. MongoDB $exists does not correspond to SQL operator exists. For SQL exists, refer to the $in operator. For Atlas Search exists, refer to the exists operator in the Atlas documentation.

    $exists - MongoDB Manual v7.0

    mongodb.com
    How do I update a MongoDB key if it doesn't exist?
    Sounds like you want to do an upsert. MongoDB has built-in support for this. Pass an extra parameter to your update() call: {upsert:true}. For example: This replaces your if-find-else-update block entirely. It will insert if the key doesn't exist and will update if it does. Before: {"key":"value", "key2":"Ohai."} After:

    python - mongodb: insert if not exists - Stack Overflow

    stackoverflow.com
    How to insert a document into a collection in MongoDB?
    You can use the following syntax to insert a document into a collection in MongoDB only if it doesn’t already exist: team : 'Hornets' }, $setOnInsert: {team: 'Hornets', points: '58', rebounds: '20'} }, {upsert: true} This particular code checks if the field “team” has a value of “Hornets.” If this value exists, then nothing will happen.

    MongoDB: How to Insert if Not Exists - Statology

    statology.org
    How do I query for null or missing fields in MongoDB?
    To query for null or missing fields, see Query for Null or Missing Fields. For data stored in MongoDB Atlas, you can use the Atlas Search exists operator when running $search queries. Running $exists after $search is less performant than running $search with the exists operator.

    $exists - MongoDB Manual v7.0

    mongodb.com
    What is a $set operator in MongoDB?
    The $set operator expression has the following form: { $set: { <field1>: <value1>, ... } } To specify a <field> in an embedded document or in an array, use dot notation. Starting in MongoDB 5.0, update operators process document fields with string-based names in lexicographic order. Fields with numeric names are processed in numeric order.

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  11. hatchjs.com
    https://hatchjs.com/insert-if-not-exists-mongodb

    MongoDB Insert If Not Exists: A Complete Guide - HatchJS.com

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  12. w3resource
    https://www.w3resource.com/mongodb/mongodb-field...

    MongoDB Field Update Operator - $set - w3resource

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  13. MongoDB
    https://www.mongodb.com/docs/rapid/reference/operator/update/set

    $set — MongoDB Manual

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  14. Delft Stack
    https://www.delftstack.com/howto/mon…

    How to Insert Records if Not Exists in MongoDB | Delft …

    Feb 2, 2024 · This instructional post will tell you how to insert records in fields of array in collections of database if they don't exist. Moreover, Upsert and $setOninsert are also explained in brief detail with code segments and …

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  15. Spark By Examples
    https://sparkbyexamples.com/mongodb/mongodb-insert-if-not-exists

    MongoDB insert if not exists - Spark By Examples

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  16. MongoDB
    https://www.mongodb.com/.../operator/aggregation/set

    $set (aggregation) - MongoDB Manual v7.0

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  17. TheCodeBuzz
    https://www.thecodebuzz.com/mongodb-add-an-element...

    MongoDB Add An Element To The Array If Not Exists

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  18. w3resource
    https://www.w3resource.com/mongodb/snippets/how-to...

    How to Query for Non-Null Fields in MongoDB? - w3resource

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  19. MongoDB
    https://www.mongodb.com/docs/manual/reference/...

    $ifNull (aggregation) - MongoDB Manual v7.0

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  20. Stack Overflow
    https://stackoverflow.com/questions/25536826

    How to run a NOT EXISTS query in MongoDB? - Stack Overflow