method

_compile_filter

v3.1.0 - Show latest stable - 0 notes - Class: ActiveSupport::Callbacks::Callback

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What's this?

_compile_filter(filter) private

Filters support:

Arrays::  Used in conditions. This is used to specify
          multiple conditions. Used internally to
          merge conditions from skip_* filters
Symbols:: A method to call
Strings:: Some content to evaluate
Procs::   A proc to call with the object
Objects:: An object with a before_foo method on it to call

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

Arrays::  Merged together into a single filter
Symbols:: Already methods
Strings:: class_eval'ed into methods
Procs::   define_method'ed 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 279
      def _compile_filter(filter)
        method_name = "_callback_#{@kind}_#{next_id}"
        case filter
        when Array
          filter.map {|f| _compile_filter(f)}
        when Symbol
          filter
        when String
          "(#{filter})"
        when Proc
          @klass.send(:define_method, method_name, &filter)
          return method_name if filter.arity <= 0

          method_name << (filter.arity == 1 ? "(self)" : " self, Proc.new ")
        else
          @klass.send(:define_method, "#{method_name}_object") { filter }

          _normalize_legacy_filter(kind, filter)
          scopes = Array.wrap(chain.config[:scope])
          method_to_call = scopes.map{ |s| s.is_a?(Symbol) ? send(s) : s }.join("_")

          @klass.class_eval             def #{method_name}(&blk)              #{method_name}_object.send(:#{method_to_call}, self, &blk)            end, __FILE__, __LINE__ + 1

          method_name
        end
      end

_compile_filter

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