class ActiveRecord::Reflection::MacroReflection

those classes. Objects of AggregateReflection and AssociationReflection are returned by the Reflection::ClassMethods.
Abstract base class for AggregateReflection and AssociationReflection that describes the interface available for both of

def ==(other_aggregation)

and +other_aggregation+ has an options hash assigned to it.
Returns +true+ if +self+ and +other_aggregation+ have the same +name+ attribute, +active_record+ attribute, 
def ==(other_aggregation)
  other_aggregation.kind_of?(self.class) && name == other_aggregation.name && other_aggregation.options && active_record == other_aggregation.active_record
end

def belongs_to?

Returns +true+ if +self+ is a +belongs_to+ reflection. 
def belongs_to?
  macro == :belongs_to
end

def class_name

and has_many :clients returns 'Client'.
Returns the class name for the macro. For example, composed_of :balance, :class_name => 'Money' returns 'Money' 
def class_name
  @class_name ||= options[:class_name] || derive_class_name
end

def derive_class_name 

def derive_class_name
  name.to_s.camelize
end

def initialize(macro, name, options, active_record) 

def initialize(macro, name, options, active_record)
  @macro, @name, @options, @active_record = macro, name, options, active_record
end

def klass

class and has_many :clients returns the Client class.
Returns the class for the macro. For example, composed_of :balance, :class_name => 'Money' returns the Money 
def klass
  @klass ||= class_name.constantize
end

def macro

or for has_many :clients will return :has_many.
Returns the macro type. For example, composed_of :balance, :class_name => 'Money' will return :composed_of 
def macro
  @macro
end

def name

:balance or for has_many :clients it will return :clients.
Returns the name of the macro. For example, composed_of :balance, :class_name => 'Money' will return 
def name
  @name
end

def options

composed_of :balance, :class_name => 'Money' or +{}+ for has_many :clients.
Returns the hash of options used for the macro. For example, it would return { :class_name => "Money" } for 
def options
  @options
end

def sanitized_conditions #:nodoc:

:nodoc: 
def sanitized_conditions #:nodoc:
  @sanitized_conditions ||= klass.send(:sanitize_sql, options[:conditions]) if options[:conditions]
end