Use flat_map { } instead of map {}.flatten

2 files changed, 4 insertions, 4 deletions

diff --git a/guides/rails_guides/helpers.rb b/guides/rails_guides/helpers.rb
index e6ef656474..c8ab9e4536 100644
--- a/guides/rails_guides/helpers.rb
+++ b/guides/rails_guides/helpers.rb
@@ -17,7 +17,7 @@ module RailsGuides
     end
 
     def documents_flat
-      documents_by_section.map {|section| section['documents']}.flatten
+      documents_by_section.flat_map {|section| section['documents']}
     end
 
     def finished_documents(documents)
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md
index 2a84242b9c..1930cbe22c 100644
--- a/guides/source/active_support_core_extensions.md
+++ b/guides/source/active_support_core_extensions.md
@@ -517,7 +517,7 @@ ActionController::TestCase.class_eval do
 
   # now redefine process and delegate to original_process
   def process(action, params=nil, session=nil, flash=nil, http_method='GET')
-    params = Hash[*params.map {|k, v| [k, v.to_s]}.flatten]
+    params = Hash[*params.flat_map {|k, v| [k, v.to_s]}]
     original_process(action, params, session, flash, http_method)
   end
 end
@@ -530,7 +530,7 @@ That technique has a risk, it could be the case that `:original_process` was tak
 ```ruby
 ActionController::TestCase.class_eval do
   def process_with_stringified_params(...)
-    params = Hash[*params.map {|k, v| [k, v.to_s]}.flatten]
+    params = Hash[*params.flat_map {|k, v| [k, v.to_s]}]
     process_without_stringified_params(action, params, session, flash, http_method)
   end
   alias_method :process_without_stringified_params, :process
@@ -543,7 +543,7 @@ The method `alias_method_chain` provides a shortcut for that pattern:
 ```ruby
 ActionController::TestCase.class_eval do
   def process_with_stringified_params(...)
-    params = Hash[*params.map {|k, v| [k, v.to_s]}.flatten]
+    params = Hash[*params.flat_map {|k, v| [k, v.to_s]}]
     process_without_stringified_params(action, params, session, flash, http_method)
   end
   alias_method_chain :process, :stringified_params