Method: Bmg::Relation#one

Defined in:
lib/bmg/relation.rb

#one ⇒ Object

Returns the only tuple that the relation contains. Throws a OneException when there is no tuple or more than one



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# File 'lib/bmg/relation.rb', line 66

def one
  one_or_yield{ raise OneError, "Relation is empty" }
end