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module ActiveRecord
module Associations
class HasOneAssociation < BelongsToAssociation #:nodoc:
def initialize(owner, association_name, association_class_name, association_class_primary_key_name, options)
super
construct_sql
end
def create(attributes = {}, replace_existing = true)
record = build(attributes, replace_existing)
record.save
record
end
def build(attributes = {}, replace_existing = true)
record = @association_class.new(attributes)
if replace_existing
replace(record, true)
else
record[@association_class_primary_key_name] = @owner.id unless @owner.new_record?
self.target = record
end
record
end
def replace(obj, dont_save = false)
load_target
unless @target.nil?
if dependent? && !dont_save && @target != obj
@target.destroy unless @target.new_record?
@owner.clear_association_cache
else
@target[@association_class_primary_key_name] = nil
@target.save unless @owner.new_record?
end
end
if obj.nil?
@target = nil
else
raise_on_type_mismatch(obj)
obj[@association_class_primary_key_name] = @owner.id unless @owner.new_record?
@target = (AssociationProxy === obj ? obj.target : obj)
end
@loaded = true
unless @owner.new_record? or obj.nil? or dont_save
return (obj.save ? self : false)
else
return (obj.nil? ? nil : self)
end
end
private
def find_target
@association_class.find(:first, :conditions => @finder_sql, :order => @options[:order])
end
def target_obsolete?
false
end
def construct_sql
@finder_sql = "#{@association_class.table_name}.#{@association_class_primary_key_name} = #{@owner.quoted_id}#{@options[:conditions] ? " AND " + @options[:conditions] : ""}"
@finder_sql << " AND (#{sanitize_sql(@options[:conditions])})" if @options[:conditions]
@finder_sql
end
end
end
end
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