Re-enabling the get_if_changed() method (#73)

* Re-enabling the get_if_changed() method, since it has been fixed in the server-side

* Trigger notification

Author: hiranya911

firebase_admin/db.py

@@ -147,7 +147,7 @@ def get(self, etag=False):
         else:
             return self._client.body('get', self._add_suffix())
 
-    def _get_if_changed(self, etag):
+    def get_if_changed(self, etag):
         """Gets data in this location only if the specified ETag does not match.
 
         Args:

integration/test_db.py

@@ -90,13 +90,11 @@ def test_get_value_and_etag(self, testref, testdata):
         assert isinstance(etag, six.string_types)
 
     def test_get_if_changed(self, testref, testdata):
-        success, data, etag = testref._get_if_changed('wrong_etag')
+        success, data, etag = testref.get_if_changed('wrong_etag')
         assert success is True
         assert data == testdata
         assert isinstance(etag, six.string_types)
-        # TODO: Server API seems to be misbehaving in the following case.
-        # TODO: Re-enable once fixed.
-        #assert testref.get_if_changed(etag) == (False, None, None)
+        assert testref.get_if_changed(etag) == (False, None, None)
 
     def test_get_child_value(self, testref, testdata):
         child = testref.child('dinosaurs')

tests/test_db.py

@@ -160,13 +160,13 @@ def test_get_if_changed(self, data):
         ref = db.reference('/test')
         recorder = self.instrument(ref, json.dumps(data))
 
-        assert ref._get_if_changed('invalid-etag') == (True, data, MockAdapter.ETAG)
+        assert ref.get_if_changed('invalid-etag') == (True, data, MockAdapter.ETAG)
         assert len(recorder) == 1
         assert recorder[0].method == 'GET'
         assert recorder[0].url == 'https://test.firebaseio.com/test.json'
         assert recorder[0].headers['if-none-match'] == 'invalid-etag'
 
-        assert ref._get_if_changed(MockAdapter.ETAG) == (False, None, None)
+        assert ref.get_if_changed(MockAdapter.ETAG) == (False, None, None)
         assert len(recorder) == 2
         assert recorder[1].method == 'GET'
         assert recorder[1].url == 'https://test.firebaseio.com/test.json'
@@ -176,7 +176,7 @@ def test_get_if_changed(self, data):
     def test_get_if_changed_invalid_etag(self, etag):
         ref = db.reference('/test')
         with pytest.raises(ValueError):
-            ref._get_if_changed(etag)
+            ref.get_if_changed(etag)
 
     @pytest.mark.parametrize('data', valid_values)
     def test_order_by_query(self, data):