Add the has_many_polymorphs plugin

[cs356-p2-videostore.git] / vendor / plugins / has_many_polymorphs / lib / has_many_polymorphs / dependencies.rb

diff --git a/vendor/plugins/has_many_polymorphs/lib/has_many_polymorphs/dependencies.rb b/vendor/plugins/has_many_polymorphs/lib/has_many_polymorphs/dependencies.rb
new file mode 100644 (file)
index 0000000..6242d95
--- /dev/null
+++ b/vendor/plugins/has_many_polymorphs/lib/has_many_polymorphs/dependencies.rb
@@ -0,0 +1,41 @@
+
+=begin rdoc
+Adds a minimal dependency injection framework so that owners of polymorphic relationships reload after their children, reinjecting the child helper methods.
+
+Overrides Dependencies#<tt>new_constants_in</tt>.
+=end
+
+module Dependencies
+    
+  mattr_accessor :injection_graph
+  self.injection_graph = Hash.new([])
+
+  # Add a dependency for this target.
+  def inject_dependency(target, *requirements)
+    target, requirements = target.to_s, requirements.map(&:to_s)    
+    injection_graph[target] = ((injection_graph[target] + requirements).uniq - [target])
+    requirements.each {|requirement| mark_for_unload requirement }
+    _logger_debug "injection graph: #{injection_graph.inspect}" if Dependencies.log_activity
+  end
+
+  # Make sure any dependent constants of the constants added by <tt>yield</tt> are reloaded.
+  def new_constants_in_with_injection(*descs, &block) # chain
+
+    if Dependencies.log_activity
+      _logger_debug "autoloaded constants: #{autoloaded_constants.inspect}"
+      _logger_debug "explicitly unloadable constants: #{explicitly_unloadable_constants.inspect}" 
+    end
+    
+    returning(new_constants_in_without_injection(*descs, &block)) do |found|
+      _logger_debug "new constants: #{found.inspect}" if Dependencies.log_activity and found.any?
+      found.each do |constant|
+        injection_graph[constant].each do |requirement| 
+          requirement.constantize
+           _logger_debug "constantized #{requirement}" if Dependencies.log_activity
+        end
+      end    
+    end
+  end
+  alias_method_chain :new_constants_in, :injection
+   
+end