1 files changed, 14 insertions, 6 deletions
diff --git a/db/migrate/20161208112130_create_routing_constraint_zones.rb b/db/migrate/20161208112130_create_routing_constraint_zones.rb
index 0fa1ef1ae..2c1ee8248 100644
--- a/db/migrate/20161208112130_create_routing_constraint_zones.rb
+++ b/db/migrate/20161208112130_create_routing_constraint_zones.rb
@@ -1,11 +1,19 @@
 class CreateRoutingConstraintZones < ActiveRecord::Migration
-  def change
-    create_table :routing_constraint_zones do |t|
-      t.string :name
-      t.integer :stop_area_ids, array: true
-      t.belongs_to :line, index: true
+  def up
+    unless table_exists? :routing_constraint_zones
+      create_table :routing_constraint_zones do |t|
+        t.string :name
+        t.integer :stop_area_ids, array: true
+        t.belongs_to :line, index: true
 
-      t.timestamps
+        t.timestamps
+      end
+    end
+  end
+
+  def down
+    if table_exists? :routing_constraint_zones
+      drop_table :routing_constraint_zones
     end
   end
 end