Why Is My "_id" Field Empty When Using mgo in Go?

Troubleshooting Retrieving "_id" Field Value in Go with mgo

This article addresses the issue of failing to retrieve the "_id" field value when using mgo with Go. The problem was encountered when attempting to fetch data from a MongoDB database.

Firstly, the code snippet defines a struct named "Article" which represents a document in the database. It contains fields such as "_id", "title", "author", and others.

The "AllArticles()" function retrieves all articles from the database and stores them in the "articles" slice. When printing the results, the "_id" field is observed to be an empty string.

To resolve this issue, it was discovered that there was a spacing issue in the struct definition. The code originally had a tab between "json:" and "bson:", but it should have been a space instead.

The corrected code is:

type Article struct {
    Id      bson.ObjectId `json:"id" bson:"_id,omitempty"`

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