Add table name prefix and suffix support to add_foreign_key and remove_foreign_key methods

fix tests

activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

@@ -832,7 +832,10 @@ module ActiveRecord
       end
 
       def foreign_key_column_for(table_name) # :nodoc:
-        "#{table_name.to_s.singularize}_id"
+        prefix = Base.table_name_prefix
+        suffix = Base.table_name_suffix
+        name = table_name.to_s =~ /#{prefix}(.+)#{suffix}/ ? $1 : table_name.to_s
+        "#{name.singularize}_id"
       end
 
       def dump_schema_information #:nodoc:

activerecord/lib/active_record/migration.rb

@@ -640,7 +640,8 @@ module ActiveRecord
         unless @connection.respond_to? :revert
           unless arguments.empty? || [:execute, :enable_extension, :disable_extension].include?(method)
             arguments[0] = proper_table_name(arguments.first, table_name_options)
-            if [:rename_table, :add_foreign_key].include?(method)
+            if [:rename_table, :add_foreign_key].include?(method) ||
+              (method == :remove_foreign_key && !arguments.second.is_a?(Hash))
               arguments[1] = proper_table_name(arguments.second, table_name_options)
             end
           end

activerecord/test/cases/migration/foreign_key_test.rb

@@ -243,6 +243,37 @@ module ActiveRecord
         silence_stream($stdout) { migration.migrate(:down) }
       end
 
+      class CreateSchoolsAndClassesMigration < ActiveRecord::Migration
+        def change
+          create_table(:schools)
+
+          create_table(:classes) do |t|
+            t.column :school_id, :integer
+          end
+          add_foreign_key :classes, :schools
+        end
+      end
+
+      def test_add_foreign_key_with_prefix
+        ActiveRecord::Base.table_name_prefix = 'p_'
+        migration = CreateSchoolsAndClassesMigration.new
+        silence_stream($stdout) { migration.migrate(:up) }
+        assert_equal 1, @connection.foreign_keys("p_classes").size
+      ensure
+        silence_stream($stdout) { migration.migrate(:down) }
+        ActiveRecord::Base.table_name_prefix = nil
+      end
+
+      def test_add_foreign_key_with_suffix
+        ActiveRecord::Base.table_name_suffix = '_s'
+        migration = CreateSchoolsAndClassesMigration.new
+        silence_stream($stdout) { migration.migrate(:up) }
+        assert_equal 1, @connection.foreign_keys("classes_s").size
+      ensure
+        silence_stream($stdout) { migration.migrate(:down) }
+        ActiveRecord::Base.table_name_suffix = nil
+      end
+
     end
   end
 end