/usr/lib/ruby/vendor_ruby/active_record/associations/belongs_to_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 | module ActiveRecord
# = Active Record Belongs To Associations
module Associations
class BelongsToAssociation < SingularAssociation #:nodoc:
def replace(record)
raise_on_type_mismatch(record) if record
update_counters(record)
replace_keys(record)
set_inverse_instance(record)
@updated = true if record
self.target = record
end
def updated?
@updated
end
private
def find_target?
!loaded? && foreign_key_present? && klass
end
def update_counters(record)
counter_cache_name = reflection.counter_cache_column
if counter_cache_name && owner.persisted? && different_target?(record)
if record
record.class.increment_counter(counter_cache_name, record.id)
end
if foreign_key_present?
klass.decrement_counter(counter_cache_name, target_id)
end
end
end
# Checks whether record is different to the current target, without loading it
def different_target?(record)
record.nil? && owner[reflection.foreign_key] ||
record && record.id != owner[reflection.foreign_key]
end
def replace_keys(record)
if record
owner[reflection.foreign_key] = record[reflection.association_primary_key(record.class)]
else
owner[reflection.foreign_key] = nil
end
end
def foreign_key_present?
owner[reflection.foreign_key]
end
# NOTE - for now, we're only supporting inverse setting from belongs_to back onto
# has_one associations.
def invertible_for?(record)
inverse = inverse_reflection_for(record)
inverse && inverse.macro == :has_one
end
def target_id
if options[:primary_key]
owner.send(reflection.name).try(:id)
else
owner[reflection.foreign_key]
end
end
def stale_state
owner[reflection.foreign_key] && owner[reflection.foreign_key].to_s
end
end
end
end
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