How to Pass BSON Documents in Go Lang for MongoDB Insertion?

Passing BSON Documents in Go Lang

When working with MongoDB in Go Lang, constructing and passing BSON documents can pose challenges. In this article, we'll delve into the specifics of these tasks, using the mgo package for MongoDB interactions.

Problem:

You're attempting to pass a BSON document created in account.go to dbEngine.go for insertion into MongoDB. However, you encounter the error: "Can't marshal interface {} as a BSON document."

Solution:

To avoid this error, it's unnecessary to manually create a BSON document. Instead, following these steps will simplify the process:

1. Define a Struct in account.go:

   • Create a struct called Account representing the document structure.
   • Annotate struct fields with bson tags to specify their corresponding BSON field names (e.g., "_id" : bson.ObjectId bson:"_id"`").

2. Update the Insert Function in dbEngine.go:

   • Change the Insert function parameter type to interface{}.
   • Within the function, establish a MongoDB connection using the mgo.Dial function.
   • Obtain a collection handle using session.DB("db_name").C("collection_name").
   • Perform the insertion using c.Insert(document).

3. Usage in Your Application:

   • Initialize an instance of the Account struct.
   • Assign values to the struct fields.
   • Pass the Account struct reference (e.g., &acc) to the dbEngine.Insert function.

By adhering to these steps, you can eliminate the marshalling error and effectively pass BSON documents for insertion into MongoDB using Go Lang.

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