Question 1

How do I implement cascade save in Bongo?

Accepted Answer

Implement the GetCascade method in your model struct to return an array of CascadeConfig, defining collection, query, properties, and handling old queries. Use DiffTracker for updates, as shown in the cascade configuration example. This allows automatic propagation of changes to related documents on save.

Question 2

Bongo vs mgo: which should I use for a Go MongoDB project?

Accepted Answer

Choose Bongo if you need ODM features like hooks, validation, and cascade operations while retaining low-level access via mgo. Opt for mgo alone if you prioritize raw performance, simplicity, and direct control without the abstraction overhead. Bongo adds convenience but introduces complexity and potential instability.

Question 3

Does Bongo support MongoDB transactions?

Accepted Answer

The README does not mention transaction support; Bongo focuses on document-level operations through mgo. For transactions, you may need to use mgo's capabilities directly or assess if Bongo's abstraction limits access to newer MongoDB features like multi-document transactions.

Question 4

How to handle pagination in Bongo queries?

Accepted Answer

After a Find operation, use the Paginate method on the ResultSet to get PaginationInfo with details like TotalRecords and RecordsOnPage. This simplifies implementing paginated results, as described in the find section with Paginate(perPage, currentPage).

Question 5

What are the validation hooks available in Bongo?

Accepted Answer

Bongo includes a Validate hook that returns a slice of errors for custom logic, along with other lifecycle hooks like BeforeSave and AfterSave. Implement these methods in your model struct and check errors using type assertion to ValidationError, as demonstrated in the saving models example.

Question 6

Is Bongo compatible with the official Go MongoDB driver?

Accepted Answer

No, Bongo is specifically a wrapper for the mgo driver and is not designed to work with the official MongoDB Go driver. If you're using the official driver, you'll need to find an alternative ODM or adapter, as Bongo's architecture depends on mgo.

Question 7

How do I track changes to fields in Bongo?

Accepted Answer

Implement the Trackable interface in your model struct with a GetDiffTracker method, then use DiffTracker to check modified fields or get all changes. Examples in the change tracking section show how to reset trackers and compare original vs. current values for auditing.

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