initial sharding stubs

test plan: n/a

Change-Id: I0d2d28f4afad7988f340190947855f610ac56ad6
Reviewed-on: https://gerrit.instructure.com/7756
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Bracken Mosbacker <bracken@instructure.com>

config/initializers/stubs.rb

@@ -0,0 +1,7 @@
+# stubs go at the bottom of the autoload path so that a plugin's version will
+# be found first
+ActiveSupport::Dependencies.autoload_paths.unshift(Rails.root + 'lib/stubs')
+
+# shard also makes modifications to AR, but those can't happen in our AR
+# initializer, since it won't be able to find Shard until this initializer runs
+Shard

lib/stubs/shard.rb

@@ -0,0 +1,53 @@
+#
+# Copyright (C) 2011 Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+class Shard
+  def self.stubbed?
+    true
+  end
+
+  def self.default
+    @default ||= Shard.new
+  end
+
+  def self.current
+    default
+  end
+
+  def self.partition_by_shard(array)
+    yield array
+  end
+
+  def activate
+    yield
+  end
+
+  def default?
+    true
+  end
+end
+
+ActiveRecord::Base.class_eval do
+  def shard
+    Shard.default
+  end
+
+  def global_id
+    id
+  end
+end