# File lib/rgen/metamodel_builder/builder_extensions.rb, line 86 def has_one(role, target_class=nil, raw_props={}, &block) props = Intermediate::Reference.new(target_class, _ownProps(raw_props).merge({ :name=>role, :upperBound=>1, :containment=>false})) raise "No opposite available" unless _oppositeProps(raw_props).empty? FeatureBlockEvaluator.eval(block, props) _build_internal(props) end