Model Resolution

LesliSystem::Klass resolves the conventional Account and Dashboard model constants for a Lesli engine namespace.

Resolve from an Object

Pass a namespaced object to derive the first segment of its class name:

resolver = LesliSystem::Klass.new(self)

resolver.engine_name
resolver.model.account
resolver.model.dashboard

For an instance of LesliSupport::TicketsController, engine_name becomes LesliSupport. Pass an instance, not a class object; passing LesliSupport::TicketsController would derive Class from the object's own class.

Resolve an Explicit Namespace

Use the engine keyword when the namespace is already known:

resolver = LesliSystem::Klass.new(engine: "LesliSupport")

resolver.engine_name
# "LesliSupport"

resolver.model.account
# LesliSupport::Account

resolver.model.dashboard
# LesliSupport::Dashboard

The explicit name must be the Ruby namespace, not the snake-case gem name.

Return Values

model is a struct with two readers:

Resolution uses Active Support's safe_constantize. A missing or unloaded model returns nil instead of raising a constant lookup error:

resolver = LesliSystem::Klass.new(engine: "LesliDate")
resolver.model.account
# nil

Check the returned constant before invoking model methods. LesliSystem does not autoload, define, or validate the resolved models and does not resolve arbitrary model names.