method

expand

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What's this?

expand(target, value, block) public

Return the parts needed to make this call, with the given input values.

Returns an array of the form:

[target, block, method, *arguments]

This array can be used as such:

target.send(method, *arguments, &block)

The actual invocation is left up to the caller to minimize call stack pollution.

Show source

# File activesupport/lib/active_support/callbacks.rb, line 390
        def expand(target, value, block)
          result = @arguments.map { |arg|
            case arg
            when :value; value
            when :target; target
            when :block; block || raise(ArgumentError)
            end
          }

          result.unshift @method_name
          result.unshift @override_block || block
          result.unshift @override_target || target

          # target, block, method, *arguments = result
          # target.send(method, *arguments, &block)
          result
        end

expand

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