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module ActiveRecord
# = Active Record Belongs To Association
module Associations
class BelongsToAssociation < SingularAssociation #:nodoc:
def handle_dependency
target.send(options[:dependent]) if load_target
end
def replace(record)
if record
raise_on_type_mismatch!(record)
update_counters(record)
replace_keys(record)
set_inverse_instance(record)
@updated = true
else
decrement_counters
remove_keys
end
self.target = record
end
def reset
super
@updated = false
end
def updated?
@updated
end
private
def find_target?
!loaded? && foreign_key_present? && klass
end
def with_cache_name
counter_cache_name = reflection.counter_cache_column
return unless counter_cache_name && owner.persisted?
yield counter_cache_name
end
def update_counters(record)
with_cache_name do |name|
return unless different_target? record
record.class.increment_counter(name, record.id)
decrement_counter name
end
end
def decrement_counters
with_cache_name { |name| decrement_counter name }
end
def decrement_counter counter_cache_name
if foreign_key_present?
klass.decrement_counter(counter_cache_name, target_id)
end
end
# Checks whether record is different to the current target, without loading it
def different_target?(record)
record.id != owner[reflection.foreign_key]
end
def replace_keys(record)
owner[reflection.foreign_key] = record[reflection.association_primary_key(record.class)]
end
def remove_keys
owner[reflection.foreign_key] = nil
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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