method

make_lambda

v4.1.8 - Show latest stable - 0 notes - Class: ActiveSupport::Callbacks::Callback

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What's this?

make_lambda(filter) private

Filters support:

Symbols:: A method to call.
Strings:: Some content to evaluate.
Procs::   A proc to call with the object.
Objects:: An object with a <tt>before_foo</tt> method on it to call.

All of these objects are compiled into methods and handled the same after this point:

Symbols:: Already methods.
Strings:: class_eval'd into methods.
Procs::   using define_method compiled into methods.
Objects::
  a method is created that calls the before_foo method
  on the object.

Show source

# File activesupport/lib/active_support/callbacks.rb, line 421
      def make_lambda(filter)
        case filter
        when Symbol
          lambda { |target, _, &blk| target.send filter, &blk }
        when String
          l = eval "lambda { |value| #{filter} }"
          lambda { |target, value| target.instance_exec(value, &l) }
        when Conditionals::Value then filter
        when ::Proc
          if filter.arity > 1
            return lambda { |target, _, &block|
              raise ArgumentError unless block
              target.instance_exec(target, block, &filter)
            }
          end

          if filter.arity <= 0
            lambda { |target, _| target.instance_exec(&filter) }
          else
            lambda { |target, _| target.instance_exec(target, &filter) }
          end
        else
          scopes = Array(chain_config[:scope])
          method_to_call = scopes.map{ |s| public_send(s) }.join("_")

          lambda { |target, _, &blk|
            filter.public_send method_to_call, target, &blk
          }
        end
      end

make_lambda

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