Archives: FAQs

A: Common structure: src/main.rs — Rocket setup, attach routes, launch src/routes/… — route handler modules src/models/… — Diesel schema, struct models src/db/… — connection pool setup (e.g. r2d2 + PgConnection) src/errors/… — error types and conversion src/migrations/… — Diesel migrations This modular separation helps scale, testing, and readability.

 A: Define custom error types (or use existing ones) and implement Responder for them, so your API can convert internal errors to HTTP responses (e.g. 400/404/500). Use Result<T, YourError> in route handlers and ? propagation. For database errors, map Diesel errors (e.g. NotFound, UniqueViolation) to appropriate HTTP status codes. Also, you may use JSON error […]

A: Diesel has a built-in migrations mechanism. You define SQL (or use the Diesel CLI) to create up/down migration files, which you run to bring your DB to the desired schema. Always version your migrations, test rollback, and in production deploy migrations before or along with your new application. Also back up your data before […]

A: Rocket offers a strongly typed, ergonomic web framework with macro-based route definitions and compile-time safety. Diesel is a powerful type-safe ORM for PostgreSQL (and other SQL DBs). Together, they allow building APIs where many errors are caught at compile time (e.g. schema mismatches). If you prefer less compile-time complexity or more dynamic flexibility, alternatives […]

A: You can use mongoose.createConnection(…) to create separate connection instances (each with its own models). Another pattern is using connection.useDb() to switch databases on the same connection, optionally with caching. Be careful about open connection limits (especially on Atlas). Use the “schema export and model initialization per connection” pattern to avoid collision.

A: Common errors include authentication failures (wrong username/password), “NetworkTimeout” if Atlas is unreachable, “Server selection timeout” if the cluster can’t be selected, or DNS/hostname resolution errors. To debug, ensure your connection string is correct, credentials are valid, IP whitelist is configured in Atlas, and network connectivity (firewalls) is open. Logging the error object (e.g. in […]

A: Some useful options include: useNewUrlParser: true and useUnifiedTopology: true (to opt into newer Mongo driver behavior)  dbName to override default DB  autoIndex: false in production (to avoid performance issues building indexes automatically)  maxPoolSize, minPoolSize to tune pooling  serverSelectionTimeoutMS to limit how long it tries to find a server Also, Mongoose buffers queries until the […]

A: Never hardcode sensitive information in your codebase. Instead, use environment variables (e.g., via a .env file) and tools like dotenv or your cloud provider’s secret management. Also, restrict network access on the MongoDB Atlas cluster (whitelist only required IPs or use VPC peering). Rotate credentials periodically and use roles with minimal privileges.

 A: Mongoose provides a higher-level abstraction over the native driver. It supports schema definitions, validation, middleware (hooks), virtual fields, and easier model-based operations. If you prefer more structure and safer handling of data formats (e.g. ensuring required fields, type coercion, custom validations), Mongoose helps enforce that. But if you want maximum flexibility and minimal overhead, […]

 A: One can try to fetch from an origin different from the API server in the browser console (or from a different domain). If CORS is not enabled properly, the browser logs a CORS error and blocks the request. Then enable CORS (or adjust origin whitelist) and test again to see that request succeeds.