Updating documents works (32b45e8a) · Commits · Chris / labs-tutorials

Go and MongoDB/First try/main.go

+42 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,23 @@ func main() {
		// getAllPosts(ctx, true) // better for a larger dataset
		// getSinglePost(ctx, bson.M{"title": "Hello!"}) // note that this is a filter.
		// Because it is a filter, the parameters have to be exact.

		// Update a single record
		// Note that there is an UpdateMany() function as referenced here: https://www.mongodb.com/blog/post/quick-start-golang--mongodb--how-to-update-documents.
		// This may be useful when updating records for several students in a class, for example.
		// Note that updating a single record will replace its contents with whatever is specified, while UpdateMany() will
		// append the docuemnt or replace a record.
		updateSingelRecord(ctx, bson.M{"title": "Inserted from Go"}, bson.M{
		"title": "Inserted from Go",
		"body": "This post was appended using the ReplaceOne function.",
		})


		// Why not, update multiple records.
		updateMultipleRecords(ctx, bson.M{"title": "Hello!"}, bson.D{
		{"$set", bson.D{{"lastUpdated", time.Now()}},
		},
		})
		}

		func insertPost(ctx context.Context, newPost bson.D) {
		@@ -103,3 +120,28 @@ func getSinglePost(ctx context.Context, filter bson.M) {
		}
		fmt.Println(postsFiltered)
		}

		func updateSingelRecord(ctx context.Context, filter bson.M, replacementObject bson.M) {
		result, err := postsCollection.ReplaceOne(
		ctx,
		filter,
		replacementObject, // Just figured this out, you need a comma to continue the statement to the next line in Go.
		// Otherwise the compiler will throw an error for unexpected end of line or something.
		)
		if err != nil {
		log.Fatal(err)
		}
		fmt.Printf("Replaced %v document(s)\n", result.ModifiedCount)
		}

		func updateMultipleRecords(ctx context.Context, filter bson.M, appendObject bson.D) {
		result, err := postsCollection.UpdateMany(
		ctx,
		filter,
		appendObject,
		)
		if err != nil {
		log.Fatal(err)
		}
		fmt.Printf("Updated %v document(s)\n", result.ModifiedCount)
		}
		No newline at end of file