Added support to is_empty/is_nonempty functions

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## 2.0.1.dev
 - Added `ngram` function
+- Added `is_empty` and `is_nonempty` functions
 
 ## 2.0.0 (March 19, 2018)
 

faunadb/query.py

@@ -196,6 +196,14 @@ def append(elements, collection):
  """See the `docs <https://fauna.com/documentation/queries#collection_functions>`__."""
  return _fn({"append": elements, "collection": collection})
 
+def is_empty(collection):
+ """See the `docs <https://fauna.com/documentation/queries#collection_functions>`__."""
+ return _fn({"is_empty": collection})
+
+def is_nonempty(collection):
+ """See the `docs <https://fauna.com/documentation/queries#collection_functions>`__."""
+ return _fn({"is_nonempty": collection})
+
 #endregion
 
 #region Read functions

tests/test_query.py

@@ -174,6 +174,20 @@ def test_prepend(self):
  def test_append(self):
  self.assertEqual(self._q(query.append([4, 5, 6], [1, 2, 3])), [1, 2, 3, 4, 5, 6])
 
+ def test_collection_predicates(self):
+ self.assertTrue(self._q(query.is_empty([])))
+ self.assertFalse(self._q(query.is_empty([1, 2, 3])))
+
+ self.assertFalse(self._q(query.is_nonempty([])))
+ self.assertTrue(self._q(query.is_nonempty([1, 2, 3])))
+
+ self._create(n=111)
+ self.assertFalse(self._q(query.is_empty(query.paginate(query.match(self.n_index_ref, 111)))))
+ self.assertTrue(self._q(query.is_empty(query.paginate(query.match(self.n_index_ref, 112)))))
+
+ self.assertTrue(self._q(query.is_nonempty(query.paginate(query.match(self.n_index_ref, 111)))))
+ self.assertFalse(self._q(query.is_nonempty(query.paginate(query.match(self.n_index_ref, 112)))))
+
  #endregion
 
  #region Read functions

tests/test_serialization.py

@@ -114,6 +114,12 @@ def test_prepend(self):
  def test_append(self):
  self.assertJson(query.append([1, 2], [3, 4]), '{"append":[1,2],"collection":[3,4]}')
 
+ def test_is_empty(self):
+ self.assertJson(query.is_empty([1, 2]), '{"is_empty":[1,2]}')
+
+ def test_is_nonempty(self):
+ self.assertJson(query.is_nonempty([1, 2]), '{"is_nonempty":[1,2]}')
+
  #endregion
 
  #region Read functions