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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_on_replace(record)
replace_keys(record)
set_inverse_instance(record)
@updated = true
else
decrement_counters
remove_keys
end
self.target = record
end
def default(&block)
writer(owner.instance_exec(&block)) if reader.nil?
end
def reset
super
@updated = false
end
def updated?
@updated
end
def decrement_counters # :nodoc:
update_counters(-1)
end
def increment_counters # :nodoc:
update_counters(1)
end
private
def update_counters(by)
if require_counter_update? && foreign_key_present?
if target && !stale_target?
target.increment!(reflection.counter_cache_column, by)
else
klass.update_counters(target_id, reflection.counter_cache_column => by)
end
end
end
def find_target?
!loaded? && foreign_key_present? && klass
end
def require_counter_update?
reflection.counter_cache_column && owner.persisted?
end
def update_counters_on_replace(record)
if require_counter_update? && different_target?(record)
owner.instance_variable_set :@_after_replace_counter_called, true
record.increment!(reflection.counter_cache_column)
decrement_counters
end
end
# Checks whether record is different to the current target, without loading it
def different_target?(record)
record.id != owner._read_attribute(reflection.foreign_key)
end
def replace_keys(record)
owner[reflection.foreign_key] = record._read_attribute(reflection.association_primary_key(record.class))
end
def remove_keys
owner[reflection.foreign_key] = nil
end
def foreign_key_present?
owner._read_attribute(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.has_one?
end
def target_id
if options[:primary_key]
owner.send(reflection.name).try(:id)
else
owner._read_attribute(reflection.foreign_key)
end
end
def stale_state
result = owner._read_attribute(reflection.foreign_key) { |n| owner.send(:missing_attribute, n, caller) }
result && result.to_s
end
end
end
end
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