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module ActiveRecord
# = Active Record Has And Belongs To Many Association
module Associations
class HasAndBelongsToManyAssociation < CollectionAssociation #:nodoc:
attr_reader :join_table
def initialize(owner, reflection)
@join_table = Arel::Table.new(reflection.join_table)
super
end
def insert_record(record, validate = true, raise = false)
if record.new_record?
if raise
record.save!(:validate => validate)
else
return unless record.save(:validate => validate)
end
end
if options[:insert_sql]
owner.connection.insert(interpolate(options[:insert_sql], record))
else
stmt = join_table.compile_insert(
join_table[reflection.foreign_key] => owner.id,
join_table[reflection.association_foreign_key] => record.id
)
owner.connection.insert stmt
end
record
end
private
def count_records
load_target.size
end
def delete_records(records, method)
if sql = options[:delete_sql]
records = load_target if records == :all
records.each { |record| owner.connection.delete(interpolate(sql, record)) }
else
relation = join_table
condition = relation[reflection.foreign_key].eq(owner.id)
unless records == :all
condition = condition.and(
relation[reflection.association_foreign_key]
.in(records.map { |x| x.id }.compact)
)
end
owner.connection.delete(relation.where(condition).compile_delete)
end
end
def invertible_for?(record)
false
end
end
end
end
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