Module: Hecks::Bluebook::Behaviour::ValueObject

Included in:
ValueObject
Defined in:
lib/hecks/bluebook/behaviour/value_object.rb

Overview

WHAT A VALUE OBJECT DOES. EXTENDED, not included — a value object is a CLASS (Class.new(self), one per declared shape), so its behaviour is singleton behaviour, and the holding half's absorb is what a generated constructor would be.

Instance Method Summary collapse

Instance Method Details

#attribute(named) ⇒ Object 



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# File 'lib/hecks/bluebook/behaviour/value_object.rb', line 16

def attribute(named) = attributes.find { |held| held.name == named.to_sym }

#closed_set? ⇒ Boolean

A one_of DECLARED but left empty used to be indistinguishable from no one_of at all — both are members: [] — so the rule about it could only live in the builder. Recording the declaration lets the language judge it, the same way an empty attribute NAME survives into the IR and is judged there.

Returns:

  • (Boolean) 


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# File 'lib/hecks/bluebook/behaviour/value_object.rb', line 14

def closed_set? = @closed_set

#sole_attribute ⇒ Object

A single-attribute value object (EmailAddressaddress, CustomerNumbervalue) is a NAME for a scalar, not a genuine group — [[feedback_name_the_scalar_field]]. Four call sites already inline this exact check (attributes.size == 1 / attributes.first) — forms/field_shape.rb (twice), adapters/driven/sql_query_builder.rb, fuzzing/invalid_value_generator.rb — kept as-is for now (not migrated to this reader), but any NEW caller should reach for this rather than add a fifth inline copy.



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# File 'lib/hecks/bluebook/behaviour/value_object.rb', line 27

def sole_attribute
  attributes.first if attributes.size == 1
end