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module ActiveRecord
module Associations
class HasOneAssociation < BelongsToAssociation #:nodoc:
def initialize(owner, reflection)
super
construct_sql
end
def create(attrs = {}, replace_existing = true)
new_record(replace_existing) { |klass| klass.create(attrs) }
end
def create!(attrs = {}, replace_existing = true)
new_record(replace_existing) { |klass| klass.create!(attrs) }
end
def build(attrs = {}, replace_existing = true)
new_record(replace_existing) { |klass| klass.new(attrs) }
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[@reflection.primary_key_name] = nil
@target.save unless @owner.new_record? || @target.new_record?
end
end
if obj.nil?
@target = nil
else
raise_on_type_mismatch(obj)
set_belongs_to_association_for(obj)
@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
@reflection.klass.find(:first,
:conditions => @finder_sql,
:order => @reflection.options[:order],
:include => @reflection.options[:include],
:readonly => @reflection.options[:readonly]
)
end
def construct_sql
case
when @reflection.options[:as]
@finder_sql =
"#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_id = #{@owner.quoted_id} AND " +
"#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(@owner.class.base_class.name.to_s)}"
else
@finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{@owner.quoted_id}"
end
@finder_sql << " AND (#{conditions})" if conditions
end
def construct_scope
create_scoping = {}
set_belongs_to_association_for(create_scoping)
{ :create => create_scoping }
end
def new_record(replace_existing)
# Make sure we load the target first, if we plan on replacing the existing
# instance. Otherwise, if the target has not previously been loaded
# elsewhere, the instance we create will get orphaned.
load_target if replace_existing
record = @reflection.klass.send(:with_scope, :create => construct_scope[:create]) { yield @reflection.klass }
if replace_existing
replace(record, true)
else
record[@reflection.primary_key_name] = @owner.id unless @owner.new_record?
self.target = record
end
record
end
end
end
end
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