Fix migrations that fail because of coupling to changed/removed models

db/migrate/20120327000582_polymorphic_payments.rb

@@ -1,5 +1,6 @@
 # Legacy table support
 class Checkout < ActiveRecord::Base; end;
+class Spree::Creditcard < ActiveRecord::Base; end;
 
 class PolymorphicPayments < ActiveRecord::Migration
   def up

db/migrate/20120618061537_move_distributor_from_order_to_product.rb

@@ -1,4 +1,7 @@
 class MoveDistributorFromOrderToProduct < ActiveRecord::Migration
+  class Distributor < ActiveRecord::Base; end
+  class Spree::Product < ActiveRecord::Base; end
+
   def up
     remove_column :spree_orders, :distributor_id
 

db/migrate/20120626013846_extract_distributor_and_supplier_address_to_spree_address.rb

@@ -1,4 +1,9 @@
 class ExtractDistributorAndSupplierAddressToSpreeAddress < ActiveRecord::Migration
+  class Supplier < ActiveRecord::Base; end
+  class Distributor < ActiveRecord::Base; end
+  class Spree::Address < ActiveRecord::Base; end
+
+
   def up
     # -- Distributors
     add_column :distributors, :pickup_address_id, :integer

db/migrate/20120626233350_rename_distributors_products_to_product_distributions.rb

@@ -1,4 +1,7 @@
 class RenameDistributorsProductsToProductDistributions < ActiveRecord::Migration
+  class Spree::ShippingMethod < ActiveRecord::Base; end
+  class ProductDistribution < ActiveRecord::Base; end
+
   def up
     # Convert m2m join table into explicit join model, and add a shipping method relation and timestamps
     rename_table :distributors_products, :product_distributions
@@ -9,7 +12,7 @@ class RenameDistributorsProductsToProductDistributions < ActiveRecord::Migration
     end
 
     # Set default shipping method on all product distributions
-    sm = Spree::ShippingMethod.first
+    sm = Spree::ShippingMethod.unscoped.first
     ProductDistribution.update_all(:shipping_method_id => sm.id) if sm
   end