Setting default values in data schema

Manepalli_Jagadeesh · 2020-08-27T05:48:56.210Z

Hello Enthusiast,
I am implementing data schema. Here i have to mention default value to a field of document.

is there any possible way to set default value to a field?

db.createCollection("collect", {
  validator: {
        $jsonSchema: {
            bsonType: "object",
            additionalProperties: true,
            required: ["component", "path"],
            properties: {
                component: {
                    bsonType: "string"
                },
                path: {
                   bsonType: "string",
                   description: "Set to default value"
             }
       }
    }
)

Best Regards,
M Jagadeesh.

Pavel_Duchovny · 2020-08-27T08:32:10.200Z

Hi @Manepalli_Jagadeesh,

The schema validation is only intend to enforce/validate a schema definition and not populate values.

The server does not have an ability to set default values and we recommend users to set it in their data access application layer or use ODM’s to set those values on the application side.

If you use Atlas you can consider having a trigger on the collection to update every inserted document with a specific filed value.

Best regards,
Pavel

Manepalli_Jagadeesh · 2020-08-27T19:46:36.914Z

Hi @Pavel_Duchovny,

Thank you for information and providing hints to implement default values.

Best Regards,
M Jagadeesh.

Llama_D_Attore · 2023-02-14T05:54:11.978Z

Heyyo @Pavel_Duchovny,

Just wanted to confirm, this is still accurate. Collection schemas have no mechanism to provide default field values for inference on new records? Instead one can enforce defaults at the client or API level.

Aires_Liu · 2025-02-11T17:59:16.768Z

same issue +1.
Default value is need in data migration

Jack_Woehr · 2025-04-22T17:34:08.181Z

See my Idea at MongoDB Feedback.