diff options
Diffstat (limited to 'activerecord/lib/active_record/association_preload.rb')
| -rw-r--r-- | activerecord/lib/active_record/association_preload.rb | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/association_preload.rb b/activerecord/lib/active_record/association_preload.rb index 911a5155fd..a205549d60 100644 --- a/activerecord/lib/active_record/association_preload.rb +++ b/activerecord/lib/active_record/association_preload.rb @@ -193,13 +193,17 @@ module ActiveRecord conditions = "t0.#{reflection.primary_key_name} #{in_or_equals_for_ids(ids)}" conditions << append_conditions(reflection, preload_options) - associated_records = reflection.klass.unscoped.where([conditions, ids]). + associated_records_proxy = reflection.klass.unscoped. includes(options[:include]). joins("INNER JOIN #{connection.quote_table_name options[:join_table]} t0 ON #{reflection.klass.quoted_table_name}.#{reflection.klass.primary_key} = t0.#{reflection.association_foreign_key}"). select("#{options[:select] || table_name+'.*'}, t0.#{reflection.primary_key_name} as the_parent_record_id"). - order(options[:order]).to_a + order(options[:order]) - set_association_collection_records(id_to_record_map, reflection.name, associated_records, 'the_parent_record_id') + all_associated_records = associated_records(ids) do |some_ids| + associated_records_proxy.where([conditions, ids]).to_a + end + + set_association_collection_records(id_to_record_map, reflection.name, all_associated_records, 'the_parent_record_id') end def preload_has_one_association(records, reflection, preload_options={}) @@ -358,13 +362,14 @@ module ActiveRecord find_options = { :select => preload_options[:select] || options[:select] || Arel::SqlLiteral.new("#{table_name}.*"), :include => preload_options[:include] || options[:include], - :conditions => [conditions, ids], :joins => options[:joins], :group => preload_options[:group] || options[:group], :order => preload_options[:order] || options[:order] } - reflection.klass.scoped.apply_finder_options(find_options).to_a + associated_records(ids) do |some_ids| + reflection.klass.scoped.apply_finder_options(find_options.merge(:conditions => [conditions, some_ids])).to_a + end end @@ -382,6 +387,17 @@ module ActiveRecord def in_or_equals_for_ids(ids) ids.size > 1 ? "IN (?)" : "= ?" end + + # Some databases impose a limit on the number of ids in a list (in Oracle its 1000) + # Make several smaller queries if necessary or make one query if the adapter supports it + def associated_records(ids) + max_ids_in_a_list = connection.ids_in_list_limit || ids.size + records = [] + ids.each_slice(max_ids_in_a_list) do |some_ids| + records += yield(some_ids) + end + records + end end end end |