Use Hash#each_key instead of Hash#keys.each

Hash#keys.each allocates an array of keys; Hash#each_key iterates through the
keys without allocating a new array. This is the reason why Hash#each_key
exists.

2 files changed, 2 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/fixtures.rb b/activerecord/lib/active_record/fixtures.rb
index 4044f5f7b2..44cc1a079f 100644
--- a/activerecord/lib/active_record/fixtures.rb
+++ b/activerecord/lib/active_record/fixtures.rb
@@ -525,7 +525,7 @@ module ActiveRecord
               conn = fs.model_class.respond_to?(:connection) ? fs.model_class.connection : connection
               table_rows = fs.table_rows
 
-              table_rows.keys.each do |table|
+              table_rows.each_key do |table|
                 conn.delete "DELETE FROM #{conn.quote_table_name(table)}", 'Fixture Delete'
               end
 
diff --git a/activerecord/lib/active_record/railties/databases.rake b/activerecord/lib/active_record/railties/databases.rake
index 458862a538..44765bd050 100644
--- a/activerecord/lib/active_record/railties/databases.rake
+++ b/activerecord/lib/active_record/railties/databases.rake
@@ -215,7 +215,7 @@ db_namespace = namespace :db do
 
       Dir["#{base_dir}/**/*.yml"].each do |file|
         if data = YAML::load(ERB.new(IO.read(file)).result)
-          data.keys.each do |key|
+          data.each_key do |key|
             key_id = ActiveRecord::FixtureSet.identify(key)
 
             if key == label || key_id == id.to_i