Fix regression with backslashes in queries.

Author: guzman-raphael

datajoint/condition.py

@@ -109,7 +109,7 @@ def prep_value(k, v):
         ):
             return '"%s"' % v
         if isinstance(v, str):
-            return '"%s"' % v.replace("%", "%%")
+            return '"%s"' % v.replace("%", "%%").replace("\\", "\\\\")
         return "%r" % v
 
     negate = False

local-docker-compose.yml

@@ -82,7 +82,7 @@ services:
       - -c
       - |
         set -e
-        pip install --user nose nose-cov coveralls flake8 ptvsd black
+        pip install --user nose nose-cov coveralls flake8 ptvsd black faker
         pip install -e .
         pip freeze | grep datajoint
         ## You may run the below tests once sh'ed into container i.e. docker exec -it datajoint-python_app_1 sh

tests/test_fetch.py

@@ -380,3 +380,11 @@ def test_dj_u_distinct(self):
         fetched_result = result.fetch(as_dict=True, order_by=("contrast", "brightness"))
         Stimulus.delete_quick()
         assert fetched_result == expected_result
+
+    def test_backslash(self):
+        # https://github.com/datajoint/datajoint-python/issues/999
+        expected = "She\Hulk"
+        Parent.insert([(2, expected)])
+        q = Parent & dict(name=expected)
+        assert q.fetch1("name") == expected
+        q.delete()