Add case-sensitive feature for Replace function (#222)

* replacetests case sensitive fix

* remove case sensitive skipped test

* refix to use django .replace

Author: maikhanhbui

mssql/functions.py

@@ -11,6 +11,7 @@
 from django.db.models.fields import BinaryField, Field
 from django.db.models.functions import Cast, NthValue, MD5, SHA1, SHA224, SHA256, SHA384, SHA512
 from django.db.models.functions.math import ATan2, Ln, Log, Mod, Round, Degrees, Radians, Power
+from django.db.models.functions.text import Replace
 from django.db.models.lookups import In, Lookup
 from django.db.models.query import QuerySet
 from django.db.models.sql.query import Query
@@ -44,6 +45,19 @@ def sqlserver_log(self, compiler, connection, **extra_context):
 def sqlserver_ln(self, compiler, connection, **extra_context):
     return self.as_sql(compiler, connection, function='LOG', **extra_context)
 
+
+def sqlserver_replace(self, compiler, connection, **extra_context):
+    current_db = "CONVERT(varchar, (SELECT DB_NAME()))"
+    with connection.cursor() as cursor:
+        cursor.execute("SELECT CONVERT(varchar, DATABASEPROPERTYEX(%s, 'collation'))" % current_db)
+        default_collation = cursor.fetchone()[0]
+    current_collation = default_collation.replace('_CI', '_CS')
+    return self.as_sql(
+            compiler, connection, function='REPLACE',
+            template = 'REPLACE(%s COLLATE %s)' % ('%(expressions)s', current_collation),
+            **extra_context
+        )
+
 def sqlserver_degrees(self, compiler, connection, **extra_context):
     return self.as_sql(
             compiler, connection, function='DEGREES',
@@ -441,6 +455,7 @@ def sqlserver_sha512(self, compiler, connection, **extra_context):
 NthValue.as_microsoft = sqlserver_nth_value
 Round.as_microsoft = sqlserver_round
 Window.as_microsoft = sqlserver_window
+Replace.as_microsoft = sqlserver_replace
 MD5.as_microsoft = sqlserver_md5
 SHA1.as_microsoft = sqlserver_sha1
 SHA224.as_microsoft = sqlserver_sha224

testapp/settings.py

@@ -138,7 +138,6 @@
     'aggregation.tests.AggregateTestCase.test_count_star',
     'aggregation_regress.tests.AggregationTests.test_values_list_annotation_args_ordering',
     'db_functions.text.test_pad.PadTests.test_pad',
-    'db_functions.text.test_replace.ReplaceTests.test_case_sensitive',
     'expressions.tests.FTimeDeltaTests.test_invalid_operator',
     'fixtures_regress.tests.TestFixtures.test_loaddata_raises_error_when_fixture_has_invalid_foreign_key',
     'invalid_models_tests.test_ordinary_fields.TextFieldTests.test_max_length_warning',