add get_graph

lib/aserto/directory/v3/reader.rb

@@ -223,6 +223,43 @@ def check_permission(object_type:, object_id:, permission:, subject_type:, subje
             )
           )
         end
+
+        #
+        # Returns object graph from anchor to subject or object.
+        #
+        # @param [String] anchor_type <description>
+        # @param [String] anchor_id <description>
+        # @param [String] object_type <description>
+        # @param [String] object_id <description>
+        # @param [String] relation <description>
+        # @param [String] subject_type <description>
+        # @param [String] <description>
+        #
+        # @return [Aserto::Directory::Reader::V3::GetGraphResponse]
+        #
+        # @example
+        #   directory.get_graph(
+        #     anchor_type: "user",
+        #     anchor_id: "[email protected]",
+        #     subject_id: "[email protected]",
+        #     subject_type: "user",
+        #     relation: "member"
+        #   )
+        def get_graph(anchor_type:, anchor_id:, object_type: "", object_id: "", relation: "", subject_type: "",
+                      subject_id: "", subject_relation: "")
+          reader.get_graph(
+            Aserto::Directory::Reader::V3::GetGraphRequest.new(
+              anchor_type: anchor_type,
+              anchor_id: anchor_id,
+              object_type: object_type,
+              object_id: object_id,
+              relation: relation,
+              subject_type: subject_type,
+              subject_id: subject_id,
+              subject_relation: subject_relation
+            )
+          )
+        end
       end
     end
   end

spec/integration/directory_spec.rb

@@ -85,6 +85,28 @@
     end.not_to raise_error
   end
 
+  it "reads the graph between user and group" do
+    expect(directory.get_graph(
+      anchor_type: "user",
+      anchor_id: "my-user",
+      subject_id: "my-user",
+      subject_type: "user",
+      relation: "member"
+    ).results.map(&:to_h)).to eq(
+      [
+        { depth: 1,
+          is_cycle: false,
+          object_id: "my-group",
+          object_type: "group",
+          path: ["group:my-group|member|user:my-user#"],
+          relation: "member",
+          subject_id: "my-user",
+          subject_relation: "",
+          subject_type: "user" }
+      ]
+    )
+  end
+
   it "reads a relation between user and group" do
     expect(directory.get_relation(
       subject_id: "my-user",