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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)
counter_cache_name = @reflection.counter_cache_column
if record.nil?
if counter_cache_name && @owner.persisted?
@reflection.klass.decrement_counter(counter_cache_name, previous_record_id) if @owner[@reflection.primary_key_name]
end
@target = @owner[@reflection.primary_key_name] = nil
else
raise_on_type_mismatch(record)
if counter_cache_name && @owner.persisted? && record.id != @owner[@reflection.primary_key_name]
@reflection.klass.increment_counter(counter_cache_name, record.id)
@reflection.klass.decrement_counter(counter_cache_name, @owner[@reflection.primary_key_name]) if @owner[@reflection.primary_key_name]
end
@target = (AssociationProxy === record ? record.target : record)
@owner[@reflection.primary_key_name] = record_id(record) if record.persisted?
@updated = true
end
set_inverse_instance(record)
loaded
record
end
def updated?
@updated
end
def stale_target?
if @target && @target.persisted?
target_id = @target.send(@reflection.association_primary_key).to_s
foreign_key = @owner.send(@reflection.primary_key_name).to_s
target_id != foreign_key
else
false
end
end
private
def find_target
find_method = if @reflection.options[:primary_key]
"find_by_#{@reflection.options[:primary_key]}"
else
"find"
end
options = @reflection.options.dup.slice(:select, :include, :readonly)
the_target = with_scope(:find => @scope[:find]) do
@reflection.klass.send(find_method,
@owner[@reflection.primary_key_name],
options
) if @owner[@reflection.primary_key_name]
end
set_inverse_instance(the_target)
the_target
end
def construct_find_scope
{ :conditions => conditions }
end
def foreign_key_present
!@owner[@reflection.primary_key_name].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 record_id(record)
record.send(@reflection.options[:primary_key] || :id)
end
def previous_record_id
@previous_record_id ||= if @reflection.options[:primary_key]
previous_record = @owner.send(@reflection.name)
previous_record.nil? ? nil : previous_record.id
else
@owner[@reflection.primary_key_name]
end
end
end
end
end
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