WIP - Allow custom scopes.

lib/jsonapi/link_builder.rb

@@ -77,23 +77,31 @@ def engine_primary_resources_url
 
     def engine_resource_path(source)
       resource_path_name = engine_resource_path_name_from_source(source)
-      engine_name.routes.url_helpers.public_send(resource_path_name, source.id)
+
+      path_parameters = source.context.try(:[], :path_parameters) || []
+      path_parameters << source.id
+      engine_name.routes.url_helpers.public_send(resource_path_name, *path_parameters)
     end
 
     def engine_resource_path_name_from_source(source)
-      scopes         = module_scopes_from_class(source.class)[1..-1]
-      base_path_name = scopes.map { |scope| scope.underscore }.join("_")
+      scopes         = scopes_from_resource_class(source.class)
+      base_path_name = scopes.map { |scope| scope.to_s.underscore }.join('_')
       end_path_name  = source.class._type.to_s.singularize
-      [base_path_name, end_path_name, "path"].reject(&:blank?).join("_")
+      [base_path_name, end_path_name, 'path'].reject(&:blank?).join('_')
+    end
+
+    def scopes_from_resource_class(resource_klass)
+      # Extension point -- allow overriding scopes in Resource definition, e.g. for nested resources.
+      resource_klass.custom_route_scopes || module_scopes_from_class(resource_klass)[1..-1]
     end
 
     def engine_resource_url(source)
       "#{ base_url }#{ engine_resource_path(source) }"
     end
 
     def engine_resources_path_name_from_class(klass)
-      scopes         = module_scopes_from_class(klass)[1..-1]
-      base_path_name = scopes.map { |scope| scope.underscore }.join("_")
+      scopes         = scopes_from_resource_class(klass)
+      base_path_name = scopes.map { |scope| scope.to_s.underscore }.join('_')
       end_path_name  = klass._type.to_s
 
       if base_path_name.blank?

lib/jsonapi/resource.rb

@@ -169,6 +169,12 @@ def custom_links(_options)
       {}
     end
 
+    # Override this to add a custom route scope.  
+    # e.g. to support nested resource routes.
+    def self.custom_route_scopes
+      nil
+    end
+
     def preloaded_fragments
       # A hash of hashes
       @preloaded_fragments ||= Hash.new