fix multisite to work with rails 4

vendor/gems/rails_multisite/lib/rails_multisite/connection_management.rb

@@ -2,6 +2,10 @@ module RailsMultisite
   class ConnectionManagement
     CONFIG_FILE = 'config/multisite.yml'
 
+    def self.rails4?
+      !!(Rails.version =~ /^4/)
+    end
+
     def self.establish_connection(opts)
       if opts[:db] == "default" && (!defined?(@@default_spec) || !@@default_spec)
         # don't do anything .. handled implicitly
@@ -18,7 +22,11 @@ module RailsMultisite
           handler = @@default_connection_handler
         end
         ActiveRecord::Base.connection_handler = handler
-        ActiveRecord::Base.connection_handler.establish_connection("ActiveRecord::Base", spec)
+        if rails4?
+          ActiveRecord::Base.connection_handler.establish_connection(ActiveRecord::Base, spec)
+        else
+          ActiveRecord::Base.connection_handler.establish_connection("ActiveRecord::Base", spec)
+        end
       end
     end
 
@@ -68,6 +76,7 @@ module RailsMultisite
     end
 
     def self.load_settings!
+      spec_klass = rails4? ? ActiveRecord::ConnectionAdapters::ConnectionSpecification : ActiveRecord::Base::ConnectionSpecification
       configs = YAML::load(File.open(self.config_filename))
       configs.each do |k,v|
         raise ArgumentError.new("Please do not name any db default!") if k == "default"
@@ -75,7 +84,7 @@ module RailsMultisite
       end
 
       @@db_spec_cache = Hash[*configs.map do |k, data|
-        [k, ActiveRecord::Base::ConnectionSpecification::Resolver.new(k, configs).spec]
+        [k, spec_klass::Resolver.new(k, configs).spec]
       end.flatten]
 
       @@host_spec_cache = {}
@@ -86,7 +95,7 @@ module RailsMultisite
         end
       end
 
-      @@default_spec = ActiveRecord::Base::ConnectionSpecification::Resolver.new(Rails.env, ActiveRecord::Base.configurations).spec
+      @@default_spec = spec_klass::Resolver.new(Rails.env, ActiveRecord::Base.configurations).spec
       ActiveRecord::Base.configurations[Rails.env]["host_names"].each do |host|
         @@host_spec_cache[host] = @@default_spec
       end
@@ -98,7 +107,9 @@ module RailsMultisite
       #
       @@default_connection_handler = ActiveRecord::Base.connection_handler
       ActiveRecord::Base.send :include, NewConnectionHandler if ActiveRecord::VERSION::MAJOR == 3
+
       ActiveRecord::Base.connection_handler = @@default_connection_handler
+
       @@connection_handlers = {}
     end