Diffo.Provider.Extension.InheritedPlaceDeclaration (Diffo v0.4.0)

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DSL entity for an inherited_place declaration inside places do on an Instance resource.

Generates an Ash calculation of the same name as role that traverses the assignment graph to inherit a place from a related source instance. The calculation is injected by TransformInheritedRefs at compile time — no PlaceRef edge is created on the consuming instance itself.

Fields

  • role — atom; the name of the generated calculation (and the place slot name from the consumer's perspective).
  • source_role — atom; the PlaceRef role to read from the resolved source instance (e.g. :location). Required.
  • via — optional list of alias atoms for multi-hop traversal. When nil the role name is used as the single alias step (single-hop default). When provided, each step filters AssignmentRelationship by that alias atom before following source_id to the next set of instances.

Example

places do
  inherited_place :installation_site, source_role: :location
  inherited_place :exchange, via: [:primary, :uplink], source_role: :location
end