Add attribute query method for parent id

Based on #97 by sj26 closes #97
stefankroes · May 7, 2013 · 8650a52 · 8650a52
1 parent 4c38dd1
commit 8650a52
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diff --git a/lib/ancestry/instance_methods.rb b/lib/ancestry/instance_methods.rb
@@ -122,6 +122,10 @@ def parent
       if parent_id.blank? then nil else unscoped_find(parent_id) end
     end
 
+    def parent_id?
+      parent_id.present?
+    end
+
     # Root
     def root_id
       if ancestor_ids.empty? then id else ancestor_ids.first end

diff --git a/test/has_ancestry_test.rb b/test/has_ancestry_test.rb
@@ -107,6 +107,7 @@ def test_tree_navigation
         # Parent assertions
         assert_equal nil, lvl0_node.parent_id
         assert_equal nil, lvl0_node.parent
+        refute lvl0_node.parent_id?
         # Root assertions
         assert_equal lvl0_node.id, lvl0_node.root_id
         assert_equal lvl0_node, lvl0_node.root
@@ -139,6 +140,7 @@ def test_tree_navigation
           # Parent assertions
           assert_equal lvl0_node.id, lvl1_node.parent_id
           assert_equal lvl0_node, lvl1_node.parent
+          assert lvl1_node.parent_id?
           # Root assertions
           assert_equal lvl0_node.id, lvl1_node.root_id
           assert_equal lvl0_node, lvl1_node.root
@@ -171,6 +173,7 @@ def test_tree_navigation
             # Parent assertions
             assert_equal lvl1_node.id, lvl2_node.parent_id
             assert_equal lvl1_node, lvl2_node.parent
+            assert lvl2_node.parent_id?
             # Root assertions
             assert_equal lvl0_node.id, lvl2_node.root_id
             assert_equal lvl0_node, lvl2_node.root