/usr/lib/ruby/vendor_ruby/active_record/associations/collection_proxy.rb is in ruby-activerecord-3.2 3.2.16-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | module ActiveRecord
module Associations
# Association proxies in Active Record are middlemen between the object that
# holds the association, known as the <tt>@owner</tt>, and the actual associated
# object, known as the <tt>@target</tt>. The kind of association any proxy is
# about is available in <tt>@reflection</tt>. That's an instance of the class
# ActiveRecord::Reflection::AssociationReflection.
#
# For example, given
#
# class Blog < ActiveRecord::Base
# has_many :posts
# end
#
# blog = Blog.first
#
# the association proxy in <tt>blog.posts</tt> has the object in +blog+ as
# <tt>@owner</tt>, the collection of its posts as <tt>@target</tt>, and
# the <tt>@reflection</tt> object represents a <tt>:has_many</tt> macro.
#
# This class has most of the basic instance methods removed, and delegates
# unknown methods to <tt>@target</tt> via <tt>method_missing</tt>. As a
# corner case, it even removes the +class+ method and that's why you get
#
# blog.posts.class # => Array
#
# though the object behind <tt>blog.posts</tt> is not an Array, but an
# ActiveRecord::Associations::HasManyAssociation.
#
# The <tt>@target</tt> object is not \loaded until needed. For example,
#
# blog.posts.count
#
# is computed directly through SQL and does not trigger by itself the
# instantiation of the actual post records.
class CollectionProxy # :nodoc:
alias :proxy_extend :extend
instance_methods.each { |m| undef_method m unless m.to_s =~ /^(?:nil\?|send|object_id|to_a)$|^__|^respond_to|proxy_/ }
delegate :group, :order, :limit, :joins, :where, :preload, :eager_load, :includes, :from,
:lock, :readonly, :having, :pluck, :to => :scoped
delegate :target, :load_target, :loaded?, :to => :@association
delegate :select, :find, :first, :last,
:build, :create, :create!,
:concat, :replace, :delete_all, :destroy_all, :delete, :destroy, :uniq,
:sum, :count, :size, :length, :empty?,
:any?, :many?, :include?,
:to => :@association
def initialize(association)
@association = association
Array.wrap(association.options[:extend]).each { |ext| proxy_extend(ext) }
end
alias_method :new, :build
def proxy_association
@association
end
def scoped
association = @association
association.scoped.extending do
define_method(:proxy_association) { association }
end
end
def respond_to?(name, include_private = false)
super ||
(load_target && target.respond_to?(name, include_private)) ||
proxy_association.klass.respond_to?(name, include_private)
end
def method_missing(method, *args, &block)
match = DynamicFinderMatch.match(method)
if match && match.instantiator?
send(:find_or_instantiator_by_attributes, match, match.attribute_names, *args) do |record|
proxy_association.send :set_owner_attributes, record
proxy_association.send :add_to_target, record
yield(record) if block_given?
end.tap do |record|
proxy_association.send :set_inverse_instance, record
end
elsif target.respond_to?(method) || (!proxy_association.klass.respond_to?(method) && Class.respond_to?(method))
if load_target
if target.respond_to?(method)
target.send(method, *args, &block)
else
begin
super
rescue NoMethodError => e
raise e, e.message.sub(/ for #<.*$/, " via proxy for #{target}")
end
end
end
else
scoped.readonly(nil).send(method, *args, &block)
end
end
# Forwards <tt>===</tt> explicitly to the \target because the instance method
# removal above doesn't catch it. Loads the \target if needed.
def ===(other)
other === load_target
end
def to_ary
load_target.dup
end
alias_method :to_a, :to_ary
def <<(*records)
proxy_association.concat(records) && self
end
alias_method :push, :<<
def clear
delete_all
self
end
def reload
proxy_association.reload
self
end
end
end
end
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