Allow more internal data exact searches

Bump version

Fix syntax error

Adjust CHANGELOG.rst

Add test for __exact on ID

CHANGELOG.rst

@@ -5,6 +5,7 @@ xapian-haystack Changelog
 Unreleased
 ----------
 
+- Add DJANGO_CT, DJANGO_ID, ID to be used with '__exact' internally.
 - Dropped support for Python 3.6.
 - Fixed DatabaseLocked errors when running management commands with
   multiple workers.

tests/xapian_tests/tests/test_query.py

@@ -236,6 +236,13 @@ class XapianSearchQueryTestCase(HaystackBackendTestCase, TestCase):
         self.sq.add_filter(SQ(django_ct='time'))
         self.assertExpectedQuery(self.sq.build_query(), 'CONTENTTYPEtime')
 
+    def test_unphrased_id(self):
+        'An internal ID should NOT be phrased so one can exclude IDs.'
+        self.sq.add_filter(SQ(id__in=['testing123', 'testing456']))
+        expected = '(Qtesting123 OR Qtesting456)'
+        self.assertExpectedQuery(
+            query=self.sq.build_query(), string_or_list=expected)
+
 
 class SearchQueryTestCase(HaystackBackendTestCase, TestCase):
     """

xapian_backend.py

@@ -42,6 +42,8 @@ TERM_PREFIXES = {
     'field': 'X'
 }
 
+_EXACT_SEARCHFIELDS = frozenset((DJANGO_CT, DJANGO_ID, ID))
+
 MEMORY_DB_NAME = ':memory:'
 
 DEFAULT_XAPIAN_FLAGS = (
@@ -1437,7 +1439,7 @@ class XapianSearchQuery(BaseSearchQuery):
 
         Assumes term is not a list.
         """
-        if field_type == 'text' and field_name not in (DJANGO_CT,):
+        if field_type == 'text' and field_name not in _EXACT_SEARCHFIELDS:
             term = '^ %s $' % term
             query = self._phrase_query(term.split(), field_name, field_type)
         else: