Getting Started

Install the package via Composer and publish any config if the package exposes it:

composer require <vendor>/<package>
php artisan vendor:publish --tag=<package>-config

Look first at the package's service provider and config file — model resolution/fetching behavior is usually configured there.
Start with the simplest case: pass a concrete model class or instance and confirm data is fetched as expected.
First use case: replace ad-hoc model lookups with the package's fetch/resolve API, then progressively introduce closure-based model definitions once the baseline works.

Implementation Patterns

Concrete model first, closure second. Wire up fetching with a string/class model, verify results, then switch to a closure-based model to confirm the 3.0.3 fix path works in your context.
Closure models for contextual resolution. Use closures when the model depends on request context, tenant, auth user, or runtime configuration. Keep closures pure and side-effect free — they may be evaluated more than once.
Centralize model definitions. Put closure definitions in config, a dedicated resolver class, or a service provider binding rather than scattering them across controllers.
Integration tip: when combining with queues, ensure the closure does not capture unserializable state. Prefer resolving the model inside the job rather than capturing a closure that closes over Eloquent models.
Testing pattern: cover both concrete and closure model paths explicitly. The 3.0.3 fix specifically targets closure models, so add a regression test that asserts data is returned when the model is a closure.

Closure model fetching was buggy before 3.0.3. If you are on 3.0.0–3.0.2 and use closures, upgrade — data fetching could silently fail or return empty results.
Closures are not serializable. Avoid passing closure-based models into queued jobs, cache payloads, or anything that serializes configuration.
Debugging closure resolution: dump the resolved model inside the closure or wrap it in a small resolver class so you can log what it returns. A closure returning null or an unexpected type is the usual culprit.
Config caching: if closures are defined in config files, php artisan config:cache can break them. Define closure models in code (providers/resolvers) instead of cached config.
Extension point: most packages of this shape expose a resolver/registry binding. Prefer extending that over subclassing internals, so patch releases like 3.0.3 do not break your customizations.
Pin and verify: after upgrading to 3.0.3, run your closure-model tests specifically; the fix is narrow and worth validating against your own closure shapes.