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module ActiveRecord
# = Active Record Belongs To Associations
module Associations
class BelongsToAssociation < AssociationProxy #:nodoc:
def create(attributes = {})
replace(@reflection.create_association(attributes))
end
def build(attributes = {})
replace(@reflection.build_association(attributes))
end
def replace(record)
record = record.target if AssociationProxy === record
raise_on_type_mismatch(record) unless record.nil?
update_counters(record)
replace_keys(record)
set_inverse_instance(record)
@target = record
@updated = true if record
loaded
record
end
def updated?
@updated
end
def stale_target?
if @target && @target.persisted?
target_id = @target[@reflection.association_primary_key].to_s
foreign_key = @owner[@reflection.foreign_key].to_s
target_id != foreign_key
else
false
end
end
private
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
target_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.id != @owner[@reflection.foreign_key]
end
def replace_keys(record)
@owner[@reflection.foreign_key] = record && record[@reflection.association_primary_key]
end
def find_target
if foreign_key_present
scoped.first.tap { |record| set_inverse_instance(record) }
end
end
def construct_find_scope
{
:conditions => construct_conditions,
:select => @reflection.options[:select],
:include => @reflection.options[:include],
:readonly => @reflection.options[:readonly]
}
end
def construct_conditions
conditions = aliased_table[@reflection.association_primary_key].
eq(@owner[@reflection.foreign_key])
conditions = conditions.and(Arel.sql(sql_conditions)) if sql_conditions
conditions
end
def foreign_key_present
!@owner[@reflection.foreign_key].nil?
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 @reflection.options[:primary_key]
@owner.send(@reflection.name).try(:id)
else
@owner[@reflection.foreign_key]
end
end
end
end
end
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