Changing examples: use 'each' instead of 'for in'

activerecord/lib/active_record/associations.rb

@@ -665,7 +665,7 @@ def association_instance_set(name, association)
     #
     # Consider the following loop using the class above:
     #
-    #   for post in Post.all
+    #   Post.all.each do |post|
     #     puts "Post:            " + post.title
     #     puts "Written by:      " + post.author.name
     #     puts "Last comment on: " + post.comments.first.created_on
@@ -674,7 +674,7 @@ def association_instance_set(name, association)
     # To iterate over these one hundred posts, we'll generate 201 database queries. Let's
     # first just optimize it for retrieving the author:
     #
-    #   for post in Post.find(:all, :include => :author)
+    #   Post.find(:all, :include => :author).each do |post|
     #
     # This references the name of the +belongs_to+ association that also used the <tt>:author</tt>
     # symbol. After loading the posts, find will collect the +author_id+ from each one and load
@@ -683,7 +683,7 @@ def association_instance_set(name, association)
     #
     # We can improve upon the situation further by referencing both associations in the finder with:
     #
-    #   for post in Post.find(:all, :include => [ :author, :comments ])
+    #   Post.find(:all, :include => [ :author, :comments ]).each do |post|
     #
     # This will load all comments with a single query. This reduces the total number of queries
     # to 3. More generally the number of queries will be 1 plus the number of associations
@@ -691,7 +691,7 @@ def association_instance_set(name, association)
     #
     # To include a deep hierarchy of associations, use a hash:
     #
-    #   for post in Post.find(:all, :include => [ :author, { :comments => { :author => :gravatar } } ])
+    #   Post.find(:all, :include => [ :author, { :comments => { :author => :gravatar } } ]).each do |post|
     #
     # That'll grab not only all the comments but all their authors and gravatar pictures.
     # You can mix and match symbols, arrays and hashes in any combination to describe the