Module: Axiom::Algebra::Extension::Methods

Defined in:

lib/axiom/algebra/extension.rb

Instance Method Summary

• #extend(*args) {|function| ... } ⇒ Extension

  Return an extended relation.

Instance Method Details

#extend(*args) {|function| ... } ⇒ Extension

Return an extended relation

Examples:

with extensions

extension = relation.extend(extensions)

with a context block

extension = relation.extend do |context|
  context.add(:total, context[:unit_price] * context[:quantity])
end

Parameters:

• args (Array) —

  optional arguments

Yields:

• (function) —

  Evaluate an extension function

Yield Parameters:

• context (Evaluator::Context) —

  the context to evaluate the function within

Returns:

• (Extension)

# File 'lib/axiom/algebra/extension.rb', line 140

def extend(*args, &block)
  Extension.new(self, coerce_to_extensions(*args, &block))
end