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-rw-r--r--activerecord/lib/active_record/associations/preloader.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations/preloader.rb b/activerecord/lib/active_record/associations/preloader.rb
index fae955f815..ecf6fb8643 100644
--- a/activerecord/lib/active_record/associations/preloader.rb
+++ b/activerecord/lib/active_record/associations/preloader.rb
@@ -186,6 +186,10 @@ module ActiveRecord
def self.preloaded_records; []; end
end
+ # Returns a class containing the logic needed to load preload the data
+ # and attach it to a relation. For example +Preloader::Association+ or
+ # +Preloader::HasManyThrough+. The class returned implements a `run` method
+ # that accepts a preloader.
def preloader_for(reflection, owners, rhs_klass)
return NullPreloader unless rhs_klass