I committed a regression around multi site today and site customization, added tests so it don't happen again

app/models/site_customization.rb

@@ -50,30 +50,36 @@ footer:after{ content: '#{error}' }"
     self.remove_from_cache!
   end
 
-  def self.enabled_style
+  def self.enabled_key
+    ENABLED_KEY.dup << RailsMultisite::ConnectionManagement.current_db
+  end
+
+  def self.enabled_style_key
     @cache ||= {}
-    preview_style = @cache[ENABLED_KEY]
+    preview_style = @cache[self.enabled_key]
     return nil if preview_style == :none
     return preview_style if preview_style
 
     @lock.synchronize do 
       style = self.where(enabled: true).first
       if style
-        @cache[ENABLED_KEY] = style.key
+        @cache[self.enabled_key] = style.key
+        return style.key
       else
-        @cache[ENABLED_KEY] = :none
+        @cache[self.enabled_key] = :none
+        return nil
       end
     end
   end
 
   def self.custom_stylesheet(preview_style)
-    preview_style ||= enabled_style
+    preview_style ||= enabled_style_key
     style = lookup_style(preview_style)
     style.stylesheet_link_tag.html_safe if style
   end
 
   def self.custom_header(preview_style)
-    preview_style ||= enabled_style
+    preview_style ||= enabled_style_key
     style = lookup_style(preview_style)
     if style && style.header
       style.header.html_safe
@@ -83,7 +89,7 @@ footer:after{ content: '#{error}' }"
   end
 
   def self.override_default_style(preview_style)
-    preview_style ||= enabled_style
+    preview_style ||= enabled_style_key
     style = lookup_style(preview_style)
     style.override_default_style if style
   end
@@ -126,7 +132,7 @@ footer:after{ content: '#{error}' }"
   end
 
   def remove_from_cache!
-    self.class.remove_from_cache!(ENABLED_KEY)
+    self.class.remove_from_cache!(self.class.enabled_key)
     self.class.remove_from_cache!(self.key)
   end
 

spec/models/site_customization_spec.rb

@@ -16,6 +16,35 @@ describe SiteCustomization do
   end
 
   context 'caching' do
+    
+    context 'enabled style' do 
+      before do
+        @customization = customization
+      end
+
+      it 'finds no style when none enabled' do 
+        SiteCustomization.enabled_style_key.should be_nil
+      end
+
+      it 'finds the enabled style' do 
+        @customization.enabled = true 
+        @customization.save
+        SiteCustomization.enabled_style_key.should == @customization.key
+      end
+
+      it 'finds no enabled style on other sites' do 
+        @customization.enabled = true 
+        @customization.save
+        
+        RailsMultisite::ConnectionManagement.expects(:current_db).returns("foo").twice
+        # the mocking is tricky, lets remove the record so we can properly pretend we are on another db
+        #  this bypasses the before / after stuff
+        SiteCustomization.exec_sql('delete from site_customizations')
+
+        SiteCustomization.enabled_style_key.should be_nil
+      end
+    end
+
     it 'should allow me to lookup a filename containing my preview stylesheet' do
       SiteCustomization.custom_stylesheet(customization.key).should == 
         "<link class=\"custom-css\" rel=\"stylesheet\" href=\"/stylesheet-cache/#{customization.key}.css?#{customization.stylesheet_hash}\" type=\"text/css\" media=\"screen\">"