Use nested path parameters from the parent when using build

lib/her/model/associations/has_many_association.rb

@@ -49,10 +49,18 @@ def self.parse(association, klass, data)
         #   user = User.find(1)
         #   new_comment = user.comments.build(:body => "Hello!")
         #   new_comment # => #<Comment user_id=1 body="Hello!">
-        # TODO: This only merges the id of the parents, handle the case
-        #       where this is more deeply nested
         def build(attributes = {})
-          @klass.build(attributes.merge(:"#{@parent.singularized_resource_name}_id" => @parent.id))
+          @klass.build(attributes.merge(:"#{@parent.singularized_resource_name}_id" => @parent.id)).tap do |resource|
+            begin
+              resource.request_path
+            rescue Her::Errors::PathError => e
+              e.missing_parameters.each do |m|
+                if id = @parent.get_attribute(m) || @parent.get_attribute("_#{m}")
+                  resource.send("_#{m}=", id)
+                end
+              end
+            end
+          end
         end
 
         # Create a new object, save it and add it to the associated collection

lib/her/model/associations/has_one_association.rb

@@ -45,7 +45,17 @@ def self.parse(*args)
         #   new_role = user.role.build(:title => "moderator")
         #   new_role # => #<Role user_id=1 title="moderator">
         def build(attributes = {})
-          @klass.build(attributes.merge(:"#{@parent.singularized_resource_name}_id" => @parent.id))
+          @klass.build(attributes.merge(:"#{@parent.singularized_resource_name}_id" => @parent.id)).tap do |resource|
+            begin
+              resource.request_path
+            rescue Her::Errors::PathError => e
+              e.missing_parameters.each do |m|
+                if id = @parent.get_attribute(m) || @parent.get_attribute("_#{m}")
+                  resource.send("_#{m}=", id)
+                end
+              end
+            end
+          end
         end
 
         # Create a new object, save it and associate it to the parent

spec/model/associations_spec.rb

@@ -490,7 +490,13 @@ def present?
 
   context "building and creating association data" do
     before do
-      spawn_model "Foo::Comment"
+      spawn_model "Foo::Like" do
+        collection_path "/users/:user_id/comments/:comment_id/likes"
+      end
+      spawn_model "Foo::Comment" do
+        collection_path "/users/:user_id/comments"
+        has_many :likes
+      end
       spawn_model "Foo::User" do
         has_many :comments
       end
@@ -502,6 +508,10 @@ def present?
         expect(@comment.body).to eq("Hello!")
         expect(@comment.user_id).to eq(10)
       end
+      it "uses nested path parameters from the parent" do
+        @like = Foo::User.new(:id => 10).comments.build(:id => 20).likes.build
+        @like.request_path.should == "/users/10/comments/20/likes"
+      end
     end
 
     context "with #create" do
@@ -511,7 +521,7 @@ def present?
           builder.use Faraday::Request::UrlEncoded
           builder.adapter :test do |stub|
             stub.get("/users/10") { [200, {}, { id: 10 }.to_json] }
-            stub.post("/comments") { |env| [200, {}, { id: 1, body: Faraday::Utils.parse_query(env[:body])["body"], user_id: Faraday::Utils.parse_query(env[:body])["user_id"].to_i }.to_json] }
+            stub.post("/users/10/comments") { |env| [200, {}, { id: 1, body: Faraday::Utils.parse_query(env[:body])["body"], user_id: Faraday::Utils.parse_query(env[:body])["user_id"].to_i }.to_json] }
           end
         end