Added support for updating documents

Author: JasonStoltz

README.md

@@ -94,6 +94,20 @@ The client can be configured to use a managed deploy by adjusting the `base_endp
 [{'id': 'INscMGmhmX4', 'errors': []}, {'id': 'JNDFojsd02', 'errors': []}]
 ```
 
+### Indexing: Updating documents (Partial Updates)
+
+```python
+>>> engine_name = 'favorite-videos'
+>>> documents = [
+    {
+      'id': 'INscMGmhmX4',
+      'title': 'Updated title'
+    }
+]
+
+>>> client.update_documents(engine_name, documents)
+```
+
 ### Get Documents
 
 ```python
@@ -119,7 +133,6 @@ The client can be configured to use a managed deploy by adjusting the `base_endp
 }
 ```
 
-
 ### Destroy Documents
 
 ```python

swiftype_app_search/client.py

@@ -81,6 +81,20 @@ def index_documents(self, engine_name, documents):
 
         return self.swiftype_session.request('post', endpoint, data=data)
 
+    def update_documents(self, engine_name, documents):
+        """
+        Update a batch of documents for an engine.
+
+        :param engine_name: Name of engine to index documents into.
+        :param documents: Hashes representing documents.
+        :return: Array of document status dictionaries. Errors will be present
+        in a document status with a key of `errors`.
+        """
+        endpoint = "engines/{}/documents".format(engine_name)
+        data = json.dumps(documents)
+
+        return self.swiftype_session.request('patch', endpoint, data=data)
+
     def destroy_documents(self, engine_name, document_ids):
         """
         Destroys documents by id for an engine.

tests/test_client.py

@@ -71,6 +71,21 @@ def test_index_documents(self):
             response = self.client.index_documents(self.engine_name, [valid_document, other_document])
             self.assertEqual(response, expected_return)
 
+    def test_update_documents(self):
+        id = 'INscMGmhmX4'
+        valid_document = {'id': id}
+        other_document = { 'body': 'some value' }
+
+        expected_return = [
+            {'id': id, 'errors': []},
+            {'id': 'some autogenerated id', 'errors': []}
+        ]
+
+        with requests_mock.Mocker() as m:
+            m.register_uri('PATCH', self.document_index_url, json=expected_return, status_code=200)
+            response = self.client.update_documents(self.engine_name, [valid_document, other_document])
+            self.assertEqual(response, expected_return)
+
     def test_get_documents(self):
         id = 'INscMGmhmX4'
         expected_return = [