Fix Relationship#grandchildren

grandchild_conditions did not properly building sql.
The sql would never return any rows

Now it returns the correct nodes

app/models/relationship.rb

@@ -197,7 +197,7 @@ def self.stringify_resource_pairs(resource_pairs, options = {})
   def grandchild_conditions
     t = self.class.arel_table
     t.grouping(t[:ancestry].matches("#{child_ancestry}/%", nil, true).and(
-                 t[:ancestry].does_not_match("#{child_ancestry}/%", nil, true)))
+                 t[:ancestry].does_not_match("#{child_ancestry}/%/%", nil, true)))
   end
 
   def child_and_grandchild_conditions

spec/models/mixins/relationship_mixin_spec.rb

@@ -813,7 +813,7 @@
     end
   end
 
-  describe "#parent_rel_ids" do
+  describe "#parent_rels" do
     it "works with relationships" do
       pars = vms[8].with_relationship_type(test_rel_type, &:parent_rels)
       pars_vms = pars.map(&:resource)
@@ -839,6 +839,24 @@
     end
   end
 
+  describe "#grandchild_rels" do
+    it "works with relationships" do
+      vms[0].with_relationship_type(test_rel_type) do
+        rels = vms[0].grandchild_rels
+        expect(rels.map(&:resource)).to match_array([vms[3], vms[4], vms[5], vms[6], vms[7]])
+      end
+    end
+  end
+
+  describe "#child_and_grandchild_rels" do
+    it "works with relationships" do
+      vms[0].with_relationship_type(test_rel_type) do
+        rels = vms[0].child_and_grandchild_rels
+        expect(rels.map(&:resource)).to match_array([vms[1], vms[2], vms[3], vms[4], vms[5], vms[6], vms[7]])
+      end
+    end
+  end
+
   protected
 
   def build_relationship_tree(tree, rel_type = test_rel_type, base_factory = :vm_vmware)