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Retrieving MongoDB Documents by _ID Array with Golang
Problem:
You possess an array containing MongoDB object _IDs. To efficiently retrieve all the corresponding documents, you seek a query that utilizes the mgo and bson packages.
Solution:
To construct the query, begin by examining the stored _IDs. If they are strings, your initial query using bson.M{"_id": bson.M{"$in": ids}} is accurate.
However, if the _IDs are object identifiers in hexadecimal form, a conversion is necessary. Follow these steps:
Here's the updated code for querying with object IDs:
<code class="go">oids := make([]bson.ObjectId, len(ids)) for i := range ids { oids[i] = bson.ObjectIdHex(ids[i]) } query := bson.M{"_id": bson.M{"$in": oids}}</code>
By following these steps, you can effectively retrieve all MongoDB documents corresponding to the specified _ID array.
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