Method: RDF::Query::Solutions#filter

Defined in:
lib/sparql/algebra/extensions.rb

#filter(expression = {}) {|solution| ... } Also known as: filter!

This method returns an undefined value.

Filters this solution sequence by the given criteria.

Parameters:

Yields:

  • (solution) —

    each solution

Yield Parameters:

Yield Returns:

  • (Boolean) 


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# File 'lib/sparql/algebra/extensions.rb', line 638

def filter(expression = {}, &block)
  case expression
    when SPARQL::Algebra::Expression
      filter_without_expression do |solution|
        expression.evaluate(solution).true?
      end
      filter_without_expression(&block) if block_given?
      self
    else filter_without_expression(expression, &block)
  end
end