/usr/lib/ruby/vendor_ruby/active_record/associations/has_many_through_association.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | require 'active_support/core_ext/object/blank'
module ActiveRecord
# = Active Record Has Many Through Association
module Associations
class HasManyThroughAssociation < HasManyAssociation #:nodoc:
include ThroughAssociation
def initialize(owner, reflection)
super
@through_records = {}
@through_association = nil
end
# Returns the size of the collection by executing a SELECT COUNT(*) query if the collection hasn't been
# loaded and calling collection.size if it has. If it's more likely than not that the collection does
# have a size larger than zero, and you need to fetch that collection afterwards, it'll take one fewer
# SELECT query if you use #length.
def size
if has_cached_counter?
owner.send(:read_attribute, cached_counter_attribute_name)
elsif loaded?
target.size
else
count
end
end
def concat(*records)
unless owner.new_record?
records.flatten.each do |record|
raise_on_type_mismatch(record)
record.save! if record.new_record?
end
end
super
end
def insert_record(record, validate = true, raise = false)
ensure_not_nested
if record.new_record?
if raise
record.save!(:validate => validate)
else
return unless record.save(:validate => validate)
end
end
save_through_record(record)
update_counter(1)
record
end
# ActiveRecord::Relation#delete_all needs to support joins before we can use a
# SQL-only implementation.
alias delete_all_on_destroy delete_all
private
def through_association
@through_association ||= owner.association(through_reflection.name)
end
# We temporarily cache through record that has been build, because if we build a
# through record in build_record and then subsequently call insert_record, then we
# want to use the exact same object.
#
# However, after insert_record has been called, we clear the cache entry because
# we want it to be possible to have multiple instances of the same record in an
# association
def build_through_record(record)
@through_records[record.object_id] ||= begin
ensure_mutable
through_record = through_association.build
through_record.send("#{source_reflection.name}=", record)
through_record
end
end
def save_through_record(record)
build_through_record(record).save!
ensure
@through_records.delete(record.object_id)
end
def build_record(attributes, options = {})
ensure_not_nested
record = super(attributes, options)
inverse = source_reflection.inverse_of
if inverse
if inverse.macro == :has_many
record.send(inverse.name) << build_through_record(record)
elsif inverse.macro == :has_one
record.send("#{inverse.name}=", build_through_record(record))
end
end
record
end
def target_reflection_has_associated_record?
if through_reflection.macro == :belongs_to && owner[through_reflection.foreign_key].blank?
false
else
true
end
end
def update_through_counter?(method)
case method
when :destroy
!inverse_updates_counter_cache?(through_reflection)
when :nullify
false
else
true
end
end
def delete_records(records, method)
ensure_not_nested
scope = through_association.scoped.where(construct_join_attributes(*records))
case method
when :destroy
count = scope.destroy_all.length
when :nullify
count = scope.update_all(source_reflection.foreign_key => nil)
else
count = scope.delete_all
end
delete_through_records(records)
if source_reflection.options[:counter_cache]
counter = source_reflection.counter_cache_column
klass.decrement_counter counter, records.map(&:id)
end
if through_reflection.macro == :has_many && update_through_counter?(method)
update_counter(-count, through_reflection)
end
update_counter(-count)
end
def through_records_for(record)
attributes = construct_join_attributes(record)
candidates = Array.wrap(through_association.target)
candidates.find_all { |c| c.attributes.slice(*attributes.keys) == attributes }
end
def delete_through_records(records)
records.each do |record|
through_records = through_records_for(record)
if through_reflection.macro == :has_many
through_records.each { |r| through_association.target.delete(r) }
else
if through_records.include?(through_association.target)
through_association.target = nil
end
end
@through_records.delete(record.object_id)
end
end
def find_target
return [] unless target_reflection_has_associated_record?
scoped.all
end
# NOTE - not sure that we can actually cope with inverses here
def invertible_for?(record)
false
end
end
end
end
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