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require "active_record/associations/through_association_scope"
require 'active_support/core_ext/object/blank'
module ActiveRecord
# = Active Record Has Many Through Association
module Associations
class HasManyThroughAssociation < HasManyAssociation #:nodoc:
include ThroughAssociationScope
alias_method :new, :build
def create!(attrs = nil)
create_record(attrs, true)
end
def create(attrs = nil)
create_record(attrs, false)
end
def destroy(*records)
transaction do
delete_records(flatten_deeper(records))
super
end
end
# Returns the size of the collection by executing a SELECT COUNT(*) query if the collection hasn't been
# loaded and calling collection.size if it has. If it's more likely than not that the collection does
# have a size larger than zero, and you need to fetch that collection afterwards, it'll take one fewer
# SELECT query if you use #length.
def size
return @owner.send(:read_attribute, cached_counter_attribute_name) if has_cached_counter?
return @target.size if loaded?
return count
end
protected
def create_record(attrs, force = true)
ensure_owner_is_not_new
transaction do
object = @reflection.klass.new(attrs)
add_record_to_target_with_callbacks(object) {|r| insert_record(object, force) }
object
end
end
def target_reflection_has_associated_record?
if @reflection.through_reflection.macro == :belongs_to && @owner[@reflection.through_reflection.primary_key_name].blank?
false
else
true
end
end
def construct_find_options!(options)
options[:joins] = construct_joins(options[:joins])
options[:include] = @reflection.source_reflection.options[:include] if options[:include].nil? && @reflection.source_reflection.options[:include]
end
def insert_record(record, force = true, validate = true)
if record.new_record?
if force
record.save!
else
return false unless record.save(:validate => validate)
end
end
through_association = @owner.send(@reflection.through_reflection.name)
through_record = through_association.create!(construct_join_attributes(record))
through_association.proxy_target << through_record
end
# TODO - add dependent option support
def delete_records(records)
klass = @reflection.through_reflection.klass
records.each do |associate|
klass.delete_all(construct_join_attributes(associate))
end
end
def find_target
return [] unless target_reflection_has_associated_record?
with_scope(construct_scope) { @reflection.klass.find(:all) }
end
def construct_sql
case
when @reflection.options[:finder_sql]
@finder_sql = interpolate_sql(@reflection.options[:finder_sql])
@finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{owner_quoted_id}"
@finder_sql << " AND (#{conditions})" if conditions
else
@finder_sql = construct_conditions
end
construct_counter_sql
end
def has_cached_counter?
@owner.attribute_present?(cached_counter_attribute_name)
end
def cached_counter_attribute_name
"#{@reflection.name}_count"
end
# NOTE - not sure that we can actually cope with inverses here
def we_can_set_the_inverse_on_this?(record)
false
end
end
end
end
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