Question 1

How to set up BossDB with PostgreSQL in an Erlang project?

Accepted Answer

Start by adding boss_db to your rebar.config, then configure DBOptions with adapter pgsql, db_host, db_port, etc., and ensure boss_news is started. Use the boss_db_rebar plugin to automate model compilation from src/model directory.

Question 2

Does BossDB support database migrations or schema changes?

Accepted Answer

No, BossDB focuses on ORM functionality and does not include built-in migration tools. You'll need to handle schema changes manually or use external tools specific to your database, like PostgreSQL's ALTER TABLE commands.

Question 3

BossDB vs raw Erlang database drivers: which is better for performance?

Accepted Answer

BossDB adds overhead with caching and ORM abstraction, but it can improve developer productivity and handle concurrency well via pooling. For maximum performance with simple queries, raw drivers might be faster, but BossDB's caching can offset this for read-heavy workloads.

Question 4

How to implement custom validation beyond type checks in BossDB?

Accepted Answer

Define a validation_tests/0 function in your model file that returns a list of test functions and error messages, as shown in the breed example. This runs after type validation if attributes have spec strings like Name::string().

Question 5

Can BossDB be used with Elixir or other BEAM languages?

Accepted Answer

Yes, since it's an Erlang library, it can be called from Elixir via interop, but the model compilation and configuration are Erlang-centric. You'll need to handle Erlang syntax for models and may face integration challenges with Elixir tooling.

Question 6

What happens if BossNews fails or is not running?

Accepted Answer

Caching invalidation and event notifications will break, potentially leading to stale cache data. The README notes BossNews is mandatory, so ensure it's monitored in production to avoid issues with real-time features.

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