Avoid adding the version attribute to deleted docs

.rubocop_todo.yml

@@ -31,7 +31,7 @@ Metrics/AbcSize:
 # Offense count: 122
 # Configuration parameters: CountComments, ExcludedMethods.
 Metrics/BlockLength:
-  Max: 837
+  Max: 900
 
 # Offense count: 1
 # Configuration parameters: CountComments.
@@ -56,7 +56,7 @@ Metrics/MethodLength:
 # Offense count: 2
 # Configuration parameters: CountComments.
 Metrics/ModuleLength:
-  Max: 191
+  Max: 200
 
 # Offense count: 6
 Metrics/PerceivedComplexity:

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### 0.8.4 (Next)
 
+* [#249](https://github.com/mongoid/mongoid-history/pull/249): Don't update version on embedded documents if the document itself is being destroyed - [@getaroom](https://github.com/getaroom).
 * [#248](https://github.com/mongoid/mongoid-history/pull/248): Don't update version on embedded documents if an ancestor is being destroyed in the same operation - [@getaroom](https://github.com/getaroom).
 * Your contribution here.
 

lib/mongoid/history/trackable.rb

@@ -325,9 +325,13 @@ def track_history_for_action?(action)
           track_history? && !(action.to_sym == :update && modified_attributes_for_update.blank?)
         end
 
+        def increment_current_version?(action)
+          action != :destroy && !ancestor_flagged_for_destroy?(_parent)
+        end
+
         def track_history_for_action(action)
           if track_history_for_action?(action)
-            current_version = ancestor_flagged_for_destroy?(_parent) ? next_version : increment_current_version
+            current_version = increment_current_version?(action) ? increment_current_version : next_version
             last_track = self.class.tracker_class.create!(
               history_tracker_attributes(action.to_sym)
               .merge(version: current_version, action: action.to_s, trackable: self)

spec/integration/integration_spec.rb

@@ -509,8 +509,8 @@ class Foo < Comment
 
       it 'should be possible to destroy after re-create embedded from parent' do
         comment.destroy
-        post.history_tracks.last.undo!(user)
-        post.history_tracks.last.undo!(user)
+        post.history_tracks[-1].undo!(user)
+        post.history_tracks[-1].undo!(user)
         post.reload
         expect(post.comments.count).to eq(0)
       end

spec/unit/trackable_spec.rb

@@ -902,6 +902,47 @@ class EmbOne
         expect(names_of_destroyed).to include 'child 2'
       end
     end
+
+    context 'with multiple embeds_many models' do
+      let(:m) do
+        MyDeeplyNestedModel.create!(
+          children: [
+            MyNestableModel.new(
+              name: 'parent',
+              children: [
+                MyNestableModel.new(name: 'child 1'),
+                MyNestableModel.new(name: 'child 2'),
+                MyNestableModel.new(name: 'child 3')
+              ]
+            )
+          ]
+        )
+      end
+
+      let(:attributes) do
+        {
+          'children_attributes' => [
+            {
+              'id' =>  m.children[0].id,
+              'children_attributes' => [
+                { 'id' => m.children[0].children[0].id, '_destroy' => '0' },
+                { 'id' => m.children[0].children[1].id, '_destroy' => '1' },
+                { 'id' => m.children[0].children[2].id, '_destroy' => '1' }
+              ]
+            }
+          ]
+        }
+      end
+
+      subject(:updated) do
+        m.update_attributes attributes
+        m.reload
+      end
+
+      it 'does not corrupt the document' do
+        expect(updated.children[0].children.length).to eq(1)
+      end
+    end
   end
 
   describe '#track_create' do