1 files changed, 3 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/associations/collection_association.rb b/activerecord/lib/active_record/associations/collection_association.rb
index 7aed64d48c..14aa557b6c 100644
--- a/activerecord/lib/active_record/associations/collection_association.rb
+++ b/activerecord/lib/active_record/associations/collection_association.rb
@@ -58,7 +58,7 @@ module ActiveRecord
             end
           end
 
-          relation.uniq.pluck(column)
+          relation.pluck(column)
         end
       end
 
@@ -71,7 +71,7 @@ module ActiveRecord
       end
 
       def reset
-        @loaded = false
+        super
         @target = []
       end
 
@@ -544,7 +544,7 @@ module ActiveRecord
         # If using a custom finder_sql, #find scans the entire collection.
         def find_by_scan(*args)
           expects_array = args.first.kind_of?(Array)
-          ids           = args.flatten.compact.uniq.map { |arg| arg.to_i }
+          ids           = args.flatten.compact.map{ |arg| arg.to_i }.uniq
 
           if ids.size == 1
             id = ids.first