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module ActiveRecord
module Associations
class AssociationProxy #:nodoc:
alias_method :proxy_respond_to?, :respond_to?
instance_methods.each { |m| undef_method m unless m =~ /(^__|^nil\?|^proxy_respond_to\?|^send)/ }
def initialize(owner, association_name, association_class_name, association_class_primary_key_name, options)
@owner = owner
@options = options
@association_name = association_name
@association_class = eval(association_class_name, nil, __FILE__, __LINE__)
@association_class_primary_key_name = association_class_primary_key_name
reset
end
def reload
reset
load_target
end
def respond_to?(symbol, include_priv = false)
proxy_respond_to?(symbol, include_priv) || (load_target && @target.respond_to?(symbol, include_priv))
end
def loaded?
@loaded
end
def loaded
@loaded = true
end
def target
@target
end
def target=(t)
@target = t
@loaded = true
end
protected
def dependent?
@options[:dependent] || false
end
def quoted_record_ids(records)
records.map { |record| record.quoted_id }.join(',')
end
def interpolate_sql_options!(options, *keys)
keys.each { |key| options[key] &&= interpolate_sql(options[key]) }
end
def interpolate_sql(sql, record = nil)
@owner.send(:interpolate_sql, sql, record)
end
def sanitize_sql(sql)
@association_class.send(:sanitize_sql, sql)
end
def extract_options_from_args!(args)
@owner.send(:extract_options_from_args!, args)
end
private
def method_missing(method, *args, &block)
load_target
@target.send(method, *args, &block)
end
def load_target
if !@owner.new_record? || foreign_key_present
begin
@target = find_target if not loaded?
rescue ActiveRecord::RecordNotFound
reset
end
end
@loaded = true if @target
@target
end
# Can be overwritten by associations that might have the foreign key available for an association without
# having the object itself (and still being a new record). Currently, only belongs_to present this scenario.
def foreign_key_present
false
end
def raise_on_type_mismatch(record)
raise ActiveRecord::AssociationTypeMismatch, "#{@association_class} expected, got #{record.class}" unless record.is_a?(@association_class)
end
end
end
end
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