method

build

rails latest stable - Class: ActiveSupport::Callbacks::Callback::CallTemplate

build(filter, callback)

public

Filters support:

Symbols:: A method to call.
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 converted into a CallTemplate and handled the same after this point.

# File activesupport/lib/active_support/callbacks.rb, line 536
        def self.build(filter, callback)
          case filter
          when Symbol
            MethodCall.new(filter)
          when Conditionals::Value
            ProcCall.new(filter)
          when ::Proc
            if filter.arity > 1
              InstanceExec2.new(filter)
            elsif filter.arity > 0
              InstanceExec1.new(filter)
            else
              InstanceExec0.new(filter)
            end
          else
            ObjectCall.new(filter, callback.current_scopes.join("_").to_sym)
          end
        end

build

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