Replace map.flatten with flat_map in activerecord

3 files changed, 5 insertions, 5 deletions

diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index 53f7591226..f725356cd9 100644
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -530,8 +530,8 @@ module ActiveRecord
     #   end
     #
     #   @firm = Firm.first
-    #   @firm.clients.collect { |c| c.invoices }.flatten # select all invoices for all clients of the firm
-    #   @firm.invoices                                   # selects all invoices by going through the Client join model
+    #   @firm.clients.flat_map { |c| c.invoices } # select all invoices for all clients of the firm
+    #   @firm.invoices                            # selects all invoices by going through the Client join model
     #
     # Similarly you can go through a +has_one+ association on the join model:
     #
diff --git a/activerecord/lib/active_record/associations/preloader/through_association.rb b/activerecord/lib/active_record/associations/preloader/through_association.rb
index 2a8530af62..70e97432e4 100644
--- a/activerecord/lib/active_record/associations/preloader/through_association.rb
+++ b/activerecord/lib/active_record/associations/preloader/through_association.rb
@@ -23,7 +23,7 @@ module ActiveRecord
 
           reset_association owners, through_reflection.name
 
-          middle_records = through_records.map { |(_,rec)| rec }.flatten
+          middle_records = through_records.flat_map { |(_,rec)| rec }
 
           preloaders = preloader.preload(middle_records,
                                          source_reflection.name,
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index 23edc8b955..baac9522b6 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -459,7 +459,7 @@ module ActiveRecord
       end
 
       def bulk_change_table(table_name, operations) #:nodoc:
-        sqls = operations.map do |command, args|
+        sqls = operations.flat_map do |command, args|
           table, arguments = args.shift, args
           method = :"#{command}_sql"
 
@@ -468,7 +468,7 @@ module ActiveRecord
           else
             raise "Unknown method called : #{method}(#{arguments.inspect})"
           end
-        end.flatten.join(", ")
+        end.join(", ")
 
         execute("ALTER TABLE #{quote_table_name(table_name)} #{sqls}")
       end