Add array id support to Model.update_counters. [#1254 state:resolved] [Carlos Júnior]

1 files changed, 17 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 8db3909d9a..479296ebae 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -927,7 +927,7 @@ module ActiveRecord #:nodoc:
       #
       # ==== Parameters
       #
-      # * +id+ - The id of the object you wish to update a counter on.
+      # * +id+ - The id of the object you wish to update a counter on or an Array of ids.
       # * +counters+ - An Array of Hashes containing the names of the fields
       #   to update as keys and the amount to update the field by as values.
       #
@@ -941,12 +941,27 @@ module ActiveRecord #:nodoc:
       #   #    SET comment_count = comment_count - 1,
       #   #        action_count = action_count + 1
       #   #  WHERE id = 5
+      #
+      #   # For the Posts with id of 10 and 15, increment the comment_count by 1
+      #   Post.update_counters [10, 15], :comment_count => 1
+      #   # Executes the following SQL:
+      #   # UPDATE posts
+      #   #    SET comment_count = comment_count + 1,
+      #   #  WHERE id IN (10, 15)
       def update_counters(id, counters)
         updates = counters.inject([]) { |list, (counter_name, increment)|
           sign = increment < 0 ? "-" : "+"
           list << "#{connection.quote_column_name(counter_name)} = COALESCE(#{connection.quote_column_name(counter_name)}, 0) #{sign} #{increment.abs}"
         }.join(", ")
-        update_all(updates, "#{connection.quote_column_name(primary_key)} = #{quote_value(id)}")
+
+        if id.is_a?(Array)
+          ids_list = id.map {|i| quote_value(i)}.join(', ')
+          condition = "IN  (#{ids_list})"
+        else
+          condition = "= #{quote_value(id)}"
+        end
+
+        update_all(updates, "#{connection.quote_column_name(primary_key)} #{condition}")
       end
 
       # Increment a number field by one, usually representing a count.