Module: Hecks::Bluebook::Behaviour::Identified

Included in:
Aggregate, Entity
Defined in:
lib/hecks/bluebook/behaviour/traits.rb

Overview

A CONSTRUCT WHOSE IDENTITY IS A JOIN OF DECLARED PATHS.

THE PATHS, IN DECLARATION ORDER, because the identity IS their join. "number.value" says which field carries the identity ; several paths say the identity is made of several facts, which is what anything named beneath another thing needs. identity_heads are the attributes those paths start at — what every reader that looks up or coerces an attribute actually wants — and identified_by is the single head, offered ONLY when there is one path to have a head of. A composite has no single head, and answering with the first would be a guess ; the readers that need all of them ask for identity_heads.

Instance Method Summary collapse

Instance Method Details

#derive_identity ⇒ Object 



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# File 'lib/hecks/bluebook/behaviour/traits.rb', line 31

def derive_identity
  @identity_paths = Array(@identified_by).map { |path| path.to_s }.reject(&:empty?)
  @identity_heads = @identity_paths.map { |path| path.split(".").first.to_sym }.uniq
  @identified_by  = @identity_heads.size == 1 ? @identity_heads.first : nil
end