diff options
Diffstat (limited to 'activerecord/lib/active_record/associations/preloader/has_and_belongs_to_many.rb')
-rw-r--r-- | activerecord/lib/active_record/associations/preloader/has_and_belongs_to_many.rb | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/activerecord/lib/active_record/associations/preloader/has_and_belongs_to_many.rb b/activerecord/lib/active_record/associations/preloader/has_and_belongs_to_many.rb deleted file mode 100644 index 9a3fada380..0000000000 --- a/activerecord/lib/active_record/associations/preloader/has_and_belongs_to_many.rb +++ /dev/null @@ -1,60 +0,0 @@ -module ActiveRecord - module Associations - class Preloader - class HasAndBelongsToMany < CollectionAssociation #:nodoc: - attr_reader :join_table - - def initialize(klass, records, reflection, preload_options) - super - @join_table = Arel::Table.new(reflection.join_table).alias('t0') - end - - # Unlike the other associations, we want to get a raw array of rows so that we can - # access the aliased column on the join table - def records_for(ids) - scope = super - klass.connection.select_all(scope.arel, 'SQL', scope.bind_values) - end - - def owner_key_name - reflection.active_record_primary_key - end - - def association_key_name - 'ar_association_key_name' - end - - def association_key - join_table[reflection.foreign_key] - end - - private - - # Once we have used the join table column (in super), we manually instantiate the - # actual records, ensuring that we don't create more than one instances of the same - # record - def associated_records_by_owner - records = {} - super.each_value do |rows| - rows.map! { |row| records[row[klass.primary_key]] ||= klass.instantiate(row) } - end - end - - def build_scope - super.joins(join).select(join_select) - end - - def join_select - association_key.as(Arel.sql(association_key_name)) - end - - def join - condition = table[reflection.association_primary_key].eq( - join_table[reflection.association_foreign_key]) - - table.create_join(join_table, table.create_on(condition)) - end - end - end - end -end |