drop unused column from sis_batches

test plan
 - migrations should work

Change-Id: I29a2b27607690ee62eee5c64e1111ea05772d2a7
Reviewed-on: https://gerrit.instructure.com/48810
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <cody@instructure.com>
QA-Review: August Thornton <august@instructure.com>
Product-Review: Rob Orton <rob@instructure.com>

app/models/sis_batch.rb

@@ -28,7 +28,7 @@ class SisBatch < ActiveRecord::Base
   belongs_to :user
 
   EXPORTABLE_ATTRIBUTES = [
-    :id, :account_id, :batch_id, :ended_at, :errored_attempts, :workflow_state, :data, :created_at, :updated_at, :attachment_id, :processing_errors,
+    :id, :account_id, :ended_at, :errored_attempts, :workflow_state, :data, :created_at, :updated_at, :attachment_id, :processing_errors,
     :processing_warnings, :batch_mode, :options, :user_id
   ]
 

config/initializers/dropped_columns.rb

@@ -48,6 +48,7 @@ class ActiveRecord::Base
     'role_overrides' => %w(context_code enrollment_type),
     'users' => %w(type creation_unique_id creation_sis_batch_id creation_email sis_name bio),
     'quizzes' => %w(root_quiz_id),
+    'sis_batches' => %w{batch_id},
     'stream_items' => %w{context_code item_asset_string},
     'stream_item_instances' => %w(context_code),
     'submissions' => %w(changed_since_publish late),

db/migrate/20150213193129_drop_batch_id_from_sis_batches.rb

@@ -0,0 +1,11 @@
+class DropBatchIdFromSisBatches < ActiveRecord::Migration
+  tag :postdeploy
+
+  def up
+    remove_column :sis_batches, :batch_id
+  end
+
+  def down
+    add_column :sis_batches, :batch_id, :string
+  end
+end