Generate Unique Indices for SortedListField and EmbeddedDocumentListFields

AUTHORS

@@ -248,4 +248,5 @@ that much better:
  * Andy Yankovsky (https://github.com/werat)
  * Bastien Gérard (https://github.com/bagerard)
  * Trevor Hall (https://github.com/tjhall13)
- * Gleb Voropaev (https://github.com/buggyspace)
+ * Gleb Voropaev (https://github.com/buggyspace)
+ * Paulo Amaral (https://github.com/pauloAmaral)

docs/changelog.rst

@@ -4,6 +4,7 @@ Changelog
 
 Development
 ===========
+- Generate Unique Indices for SortedListField and EmbeddedDocumentListFields #2020
 - (Fill this out as you fix issues and develop your features).
 
 Changes in 0.17.0

mongoengine/base/document.py

@@ -883,7 +883,8 @@ class BaseDocument(object):
                 index = {'fields': fields, 'unique': True, 'sparse': sparse}
                 unique_indexes.append(index)
 
-            if field.__class__.__name__ == 'ListField':
+            if field.__class__.__name__ in {'EmbeddedDocumentListField',
+                                            'ListField', 'SortedListField'}:
                 field = field.field
 
             # Grab any embedded document field unique indexes

tests/document/indexes.py

@@ -708,6 +708,77 @@ class IndexesTest(unittest.TestCase):
 
         self.assertRaises(NotUniqueError, post2.save)
 
+    def test_unique_embedded_document_in_sorted_list(self):
+        """
+        Ensure that the uniqueness constraints are applied to fields in
+        embedded documents, even when the embedded documents in a sorted list
+        field.
+        """
+        class SubDocument(EmbeddedDocument):
+            year = IntField()
+            slug = StringField(unique=True)
+
+        class BlogPost(Document):
+            title = StringField()
+            subs = SortedListField(EmbeddedDocumentField(SubDocument),
+                                   ordering='year')
+
+        BlogPost.drop_collection()
+
+        post1 = BlogPost(
+            title='test1', subs=[
+                SubDocument(year=2009, slug='conflict'),
+                SubDocument(year=2009, slug='conflict')
+            ]
+        )
+        post1.save()
+
+        # confirm that the unique index is created
+        indexes = BlogPost._get_collection().index_information()
+        self.assertIn('subs.slug_1', indexes)
+        self.assertTrue(indexes['subs.slug_1']['unique'])
+
+        post2 = BlogPost(
+            title='test2', subs=[SubDocument(year=2014, slug='conflict')]
+        )
+
+        self.assertRaises(NotUniqueError, post2.save)
+
+    def test_unique_embedded_document_in_embedded_document_list(self):
+        """
+        Ensure that the uniqueness constraints are applied to fields in
+        embedded documents, even when the embedded documents in an embedded
+        list field.
+        """
+        class SubDocument(EmbeddedDocument):
+            year = IntField()
+            slug = StringField(unique=True)
+
+        class BlogPost(Document):
+            title = StringField()
+            subs = EmbeddedDocumentListField(SubDocument)
+
+        BlogPost.drop_collection()
+
+        post1 = BlogPost(
+            title='test1', subs=[
+                SubDocument(year=2009, slug='conflict'),
+                SubDocument(year=2009, slug='conflict')
+            ]
+        )
+        post1.save()
+
+        # confirm that the unique index is created
+        indexes = BlogPost._get_collection().index_information()
+        self.assertIn('subs.slug_1', indexes)
+        self.assertTrue(indexes['subs.slug_1']['unique'])
+
+        post2 = BlogPost(
+            title='test2', subs=[SubDocument(year=2014, slug='conflict')]
+        )
+
+        self.assertRaises(NotUniqueError, post2.save)
+
     def test_unique_with_embedded_document_and_embedded_unique(self):
         """Ensure that uniqueness constraints are applied to fields on
         embedded documents.  And work with unique_with as well.