Allow DataMapper::Model descendants to have different storage names and work with auto_upgrade/auto_migrate

allow-subclassed-model-to-have-different-storage.patch

From dac3c04bba2898757e0ea7004b49ec7f63894d50 Mon Sep 17 00:00:00 2001
From: Kabari Hendrick <kabari@gmail.com>
Date: Tue, 14 Dec 2010 00:26:54 -0600
Subject: [PATCH] allow subclassesd models to have different storage


Signed-off-by: Kabari Hendrick <kabari@gmail.com>
---
 lib/dm-migrations/auto_migration.rb      |    6 +-
 spec/integration/model_migration_spec.rb |   64 ++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+), 3 deletions(-)
 create mode 100644 spec/integration/model_migration_spec.rb

diff --git a/lib/dm-migrations/auto_migration.rb b/lib/dm-migrations/auto_migration.rb
index cc0f53b..36c0b40 100644
--- a/lib/dm-migrations/auto_migration.rb
+++ b/lib/dm-migrations/auto_migration.rb
@@ -139,7 +139,7 @@ module DataMapper
       def auto_upgrade!(repository_name = self.repository_name)
         assert_valid(true)
         base_model = self.base_model
-        if base_model == self
+        if base_model == self || (self.storage_names[repository_name] != base_model.storage_names[repository_name])
           repository(repository_name).upgrade_model_storage(self)
         else
           base_model.auto_upgrade!(repository_name)
@@ -156,7 +156,7 @@ module DataMapper
       def auto_migrate_down!(repository_name = self.repository_name)
         assert_valid(true)
         base_model = self.base_model
-        if base_model == self
+        if base_model == self || (self.storage_names[repository_name] != base_model.storage_names[repository_name])
           repository(repository_name).destroy_model_storage(self)
         else
           base_model.auto_migrate_down!(repository_name)
@@ -171,7 +171,7 @@ module DataMapper
       def auto_migrate_up!(repository_name = self.repository_name)
         assert_valid(true)
         base_model = self.base_model
-        if base_model == self
+        if base_model == self || (self.storage_names[repository_name] != base_model.storage_names[repository_name])
           repository(repository_name).create_model_storage(self)
         else
           base_model.auto_migrate_up!(repository_name)
diff --git a/spec/integration/model_migration_spec.rb b/spec/integration/model_migration_spec.rb
new file mode 100644
index 0000000..d7c8f21
--- /dev/null
+++ b/spec/integration/model_migration_spec.rb
@@ -0,0 +1,64 @@
+describe DataMapper::Migrations do
+  describe "inheritance" do
+    supported_by(:postgres, :mysql, :sqlite, :oracle, :sqlserver) do
+      describe "child tables" do
+        before(:all) do
+          module ::Hospital
+            class Person
+              include DataMapper::Resource
+              property :id, Serial
+              property :name, String
+            end
+
+            class Doctor < Person
+              self.storage_names[:default] = 'doctors'
+
+              property :hospital, String
+            end
+          end
+    
+          @person_model = Hospital::Person
+          @doctor_model = Hospital::Doctor
+        end
+  
+        after(:each) do
+          repository.destroy_model_storage(@person_model)
+          repository.destroy_model_storage(@doctor_model)
+        end
+  
+        describe "::auto_migrate!" do
+          it 'should migrate if #storage_name is different' do
+            @person_model.auto_migrate!
+            repository.storage_exists?(@person_model.storage_name).should be(true)
+            @doctor_model.auto_migrate!
+            repository.storage_exists?(@doctor_model.storage_name).should be(true)
+          end
+        end
+  
+        describe "::auto_upgrade!" do
+          before(:all) do
+            module Hospital
+              class Doctor < Person
+                property :resident, Boolean
+              end
+            end
+          end
+    
+          before(:each) do
+            @person_model.auto_migrate!
+            @person_model.auto_migrate!
+          end
+    
+          # sanity check
+          it { @doctor_model.properties[:resident].should_not be(nil) }
+    
+          # There is probably a better way to test this...
+          it 'should upgrade if #storage_name is different' do
+            @doctor_model.auto_upgrade!
+            lambda { @doctor_model.first(:resident) }.should_not raise_error(ArgumentError)
+          end
+        end
+      end
+    end # supported_by
+  end
+end
-- 
1.7.3.3