diff options
Diffstat (limited to 'activerecord/lib/active_record/associations.rb')
| -rwxr-xr-x | activerecord/lib/active_record/associations.rb | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb index 3692be3aeb..cb17b6e483 100755 --- a/activerecord/lib/active_record/associations.rb +++ b/activerecord/lib/active_record/associations.rb @@ -487,7 +487,8 @@ module ActiveRecord # When eager loaded, conditions are interpolated in the context of the model class, not the model instance. Conditions are lazily interpolated # before the actual model exists. # - # Eager loading is not possible with polymorphic associations. Given + # Eager loading is not supported with polymorphic associations up to (and including) + # version 2.0.2. Given # # class Address < ActiveRecord::Base # belongs_to :addressable, :polymorphic => true @@ -500,6 +501,9 @@ module ActiveRecord # will raise <tt>ActiveRecord::EagerLoadPolymorphicError</tt>. The reason is that the parent model's type # is a column value so its corresponding table name cannot be put in the FROM/JOIN clauses of that early query. # + # In versions greater than 2.0.2 eager loading in polymorphic associations is supported + # thanks to a change in the overall preloading strategy. + # # It does work the other way around though: if the <tt>User</tt> model is <tt>addressable</tt> you can eager load # their addresses with <tt>:include</tt> just fine, every piece needed to construct the query is known beforehand. # |