-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) do |reflection|
- reflection.create_association(attrs)
- end
- end
-
- def create!(attrs = {}, replace_existing = true)
- new_record(replace_existing) do |reflection|
- reflection.create_association!(attrs)
- end
- end
-
- def build(attrs = {}, replace_existing = true)
- new_record(replace_existing) do |reflection|
- reflection.build_association(attrs)
- end
- end
-
- def replace(obj, dont_save = false)
- load_target
-
- unless @target.nil? || @target == obj
- if dependent? && !dont_save
- case @reflection.options[:dependent]
- when :delete
- @target.delete unless @target.new_record?
- @owner.clear_association_cache
- when :destroy
- @target.destroy unless @target.new_record?
- @owner.clear_association_cache
- when :nullify
- @target[@reflection.primary_key_name] = nil
- @target.save unless @owner.new_record? || @target.new_record?
- end
- 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
-
- protected
- def owner_quoted_id
- if @reflection.options[:primary_key]
- @owner.class.quote_value(@owner.send(@reflection.options[:primary_key]))
- else
- @owner.quoted_id
- end
- end
-
- private
- def find_target
- @reflection.klass.find(:first,
- :conditions => @finder_sql,
- :select => @reflection.options[:select],
- :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]) do
- yield @reflection
- end
-
- 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