Merge pull request #49268 from ghiculescu/cpk-guide

Add Composite Primary Keys guide to guides index

activerecord/lib/active_record/relation/finder_methods.rb

@@ -16,7 +16,7 @@ module FinderMethods
     #   Person.find("1")        # returns the object for ID = 1
     #   Person.find("31-sarah") # returns the object for ID = 31
     #   Person.find(1, 2, 6)    # returns an array for objects with IDs in (1, 2, 6)
-    #   Person.find([7, 17])    # returns an array for objects with IDs in (7, 17)
+    #   Person.find([7, 17])    # returns an array for objects with IDs in (7, 17), or with composite primary key [7, 17]
     #   Person.find([1])        # returns an array for the object with ID = 1
     #   Person.where("administrator = 1").order("created_on DESC").find(1)
     #

guides/source/documents.yaml

@@ -253,6 +253,10 @@
       work_in_progress: true
       url: active_record_encryption.html
       description: This guide covers encrypting your database information using Active Record.
+    -
+      name: Composite Primary Keys in Active Record
+      url: active_record_composite_primary_keys.html
+      description: This guide is an introduction to composite primary keys for database tables.
 
 -
   name: Extending Rails