diff options
| -rw-r--r-- | activerecord/lib/active_record/associations/collection_proxy.rb | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/associations/collection_proxy.rb b/activerecord/lib/active_record/associations/collection_proxy.rb index d57fa40b91..a9a4eb8728 100644 --- a/activerecord/lib/active_record/associations/collection_proxy.rb +++ b/activerecord/lib/active_record/associations/collection_proxy.rb @@ -672,7 +672,11 @@ module ActiveRecord end # Returns the size of the collection. If the collection hasn't been loaded, - # it executes a <tt>SELECT COUNT(*)</tt> query. + # it executes a <tt>SELECT COUNT(*)</tt> query. If it has, calls <tt>collection.size</tt>. + # + # If the collection has been already loaded +size+ and +length+ are + # equivalent. If not and you are going to need the records anyway + # +length+ will take one less query. Otherwise +size+ is more efficient. # # class Person < ActiveRecord::Base # has_many :pets @@ -697,7 +701,8 @@ module ActiveRecord # Returns the size of the collection calling +size+ on the target. # If the collection has been already loaded, +length+ and +size+ are - # equivalent. + # equivalent. If not and you are going to need the records anyway this + # method will take one less query. Otherwise +size+ is more efficient. # # class Person < ActiveRecord::Base # has_many :pets |