143 lines
4.6 KiB
Ruby
143 lines
4.6 KiB
Ruby
module ActiveRecord
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module Associations
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class HasOneAssociation < BelongsToAssociation #:nodoc:
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def initialize(owner, reflection)
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super
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construct_sql
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end
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def create(attrs = {}, replace_existing = true)
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new_record(replace_existing) do |reflection|
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attrs = merge_with_conditions(attrs)
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reflection.create_association(attrs)
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end
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end
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def create!(attrs = {}, replace_existing = true)
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new_record(replace_existing) do |reflection|
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attrs = merge_with_conditions(attrs)
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reflection.create_association!(attrs)
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end
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end
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def build(attrs = {}, replace_existing = true)
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new_record(replace_existing) do |reflection|
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attrs = merge_with_conditions(attrs)
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reflection.build_association(attrs)
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end
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end
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def replace(obj, dont_save = false)
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load_target
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unless @target.nil? || @target == obj
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if dependent? && !dont_save
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case @reflection.options[:dependent]
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when :delete
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@target.delete unless @target.new_record?
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@owner.clear_association_cache
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when :destroy
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@target.destroy unless @target.new_record?
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@owner.clear_association_cache
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when :nullify
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@target[@reflection.primary_key_name] = nil
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@target.save unless @owner.new_record? || @target.new_record?
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end
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else
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@target[@reflection.primary_key_name] = nil
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@target.save unless @owner.new_record? || @target.new_record?
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end
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end
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if obj.nil?
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@target = nil
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else
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raise_on_type_mismatch(obj)
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set_belongs_to_association_for(obj)
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@target = (AssociationProxy === obj ? obj.target : obj)
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end
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set_inverse_instance(obj, @owner)
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@loaded = true
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unless @owner.new_record? or obj.nil? or dont_save
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return (obj.save ? self : false)
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else
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return (obj.nil? ? nil : self)
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end
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end
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protected
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def owner_quoted_id
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if @reflection.options[:primary_key]
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@owner.class.quote_value(@owner.send(@reflection.options[:primary_key]))
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else
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@owner.quoted_id
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end
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end
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private
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def find_target
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the_target = @reflection.klass.find(:first,
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:conditions => @finder_sql,
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:select => @reflection.options[:select],
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:order => @reflection.options[:order],
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:include => @reflection.options[:include],
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:readonly => @reflection.options[:readonly]
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)
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set_inverse_instance(the_target, @owner)
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the_target
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end
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def construct_sql
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case
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when @reflection.options[:as]
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@finder_sql =
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"#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_id = #{owner_quoted_id} AND " +
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"#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(@owner.class.base_class.name.to_s)}"
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else
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@finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{owner_quoted_id}"
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end
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@finder_sql << " AND (#{conditions})" if conditions
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end
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def construct_scope
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create_scoping = {}
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set_belongs_to_association_for(create_scoping)
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{ :create => create_scoping }
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end
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def new_record(replace_existing)
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# Make sure we load the target first, if we plan on replacing the existing
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# instance. Otherwise, if the target has not previously been loaded
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# elsewhere, the instance we create will get orphaned.
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load_target if replace_existing
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record = @reflection.klass.send(:with_scope, :create => construct_scope[:create]) do
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yield @reflection
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end
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if replace_existing
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replace(record, true)
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else
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record[@reflection.primary_key_name] = @owner.id unless @owner.new_record?
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self.target = record
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set_inverse_instance(record, @owner)
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end
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record
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end
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def merge_with_conditions(attrs={})
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attrs ||= {}
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attrs.update(@reflection.options[:conditions]) if @reflection.options[:conditions].is_a?(Hash)
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attrs
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end
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def we_can_set_the_inverse_on_this?(record)
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inverse = @reflection.inverse_of
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return !inverse.nil?
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end
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end
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end
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end
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