Select Rows: Add code for support of old settings and ensure its removal in the future

Author: janezd

Orange/widgets/data/owselectrows.py

@@ -56,7 +56,12 @@ def encode_setting(self, context, setting, value):
     def decode_setting(self, setting, value, domain=None):
         value = super().decode_setting(setting, value, domain)
         if setting.name == 'conditions':
-            for i, (attr, _, op, values) in enumerate(value):
+            # Use this after 1. 1. 2021:
+            # for i, (attr, _, op, values) in enumerate(value):
+            for i, condition in enumerate(value):
+                attr = condition[0]
+                op, values = condition[-2:]
+
                 var = attr in domain and domain[attr]
                 if var and var.is_continuous and not isinstance(var, TimeVariable):
                     value[i] = (attr, op,
@@ -71,7 +76,10 @@ def match(self, context, domain, attrs, metas):
         conditions = context.values["conditions"]
         all_vars = attrs
         all_vars.update(metas)
-        if all(all_vars.get(name) == tpe for name, tpe, *_ in conditions):
+        # Use this after 1. 1. 2021:
+        # if all(all_vars.get(name) == tpe for name, tpe, *_ in conditions):
+        if all(all_vars.get(name) == tpe if len(rest) == 2 else name in all_vars
+               for name, tpe, *rest in conditions):
             return 0.5
         return self.NO_MATCH
 
@@ -705,11 +713,13 @@ def send_report(self):
                  ("Non-matching data",
                   nonmatch_inst > 0 and "{} instances".format(nonmatch_inst))))
 
-    @classmethod
-    def migrate_context(cls, context, version):
-        if not version:
-            # Just remove; can't migrate because variables types are unknown
-            context.values["conditions"] = []
+    # Uncomment this on 1. 1. 2021
+    #
+    # @classmethod
+    # def migrate_context(cls, context, version):
+    #     if not version:
+    #         # Just remove; can't migrate because variables types are unknown
+    #         context.values["conditions"] = []
 
 
 class CheckBoxPopup(QWidget):

Orange/widgets/data/tests/test_owselectrows.py

@@ -1,5 +1,7 @@
 # Test methods with long descriptive names can omit docstrings
 # pylint: disable=missing-docstring
+import time
+
 from AnyQt.QtCore import QLocale, Qt
 from AnyQt.QtTest import QTest
 from AnyQt.QtWidgets import QLineEdit, QComboBox
@@ -259,15 +261,40 @@ def test_change_var_type(self):
         new_iris = iris.transform(new_domain)
         self.send_signal(self.widget.Inputs.data, new_iris)
 
-    def test_migration_to_version_1(self):
-        iris = Table("iris")
+    # Uncomment this on 1. 1. 2021
+    #
+    # def test_migration_to_version_1(self):
+    #     iris = Table("iris")
+    #
+    #     ch = SelectRowsContextHandler()
+    #     context = ch.new_context(iris.domain, *ch.encode_domain(iris.domain))
+    #     context.values = dict(conditions=[["petal length", 2, (5.2,)]])
+    #     settings = dict(context_settings=[context])
+    #     widget = self.create_widget(OWSelectRows, settings)
+    #     self.assertEqual(widget.conditions, [])
 
-        ch = SelectRowsContextHandler()
-        context = ch.new_context(iris.domain, *ch.encode_domain(iris.domain))
-        context.values = dict(conditions=[["petal length", 2, (5.2,)]])
-        settings = dict(context_settings=[context])
-        widget = self.create_widget(OWSelectRows, settings)
-        self.assertEqual(widget.conditions, [])
+    @override_locale(QLocale.C)
+    def test_use_settings(self):
+        iris = Table("iris")
+        self.widget = self.widget_with_context(
+            iris.domain, [["sepal length", 2, ("5.2",)]])
+        self.send_signal(self.widget.Inputs.data, iris)
+        condition = self.widget.conditions[0]
+        self.assertEqual(condition[0], "sepal length")
+        self.assertEqual(condition[1], 2)
+        self.assertTrue(condition[2][0].startswith("5.2"))
+
+    def test_end_support_for_version_0(self):
+        if time.gmtime().tm_year == 2021:
+            self.fail("""
+Happy new year 2021!
+
+Now remove support for version==None settings in
+SelectRowsContextHandler.decode_setting and SelectRowsContextHandler.match,
+uncomment OWSelectRows.migrate, and remove this test.
+
+Basically, undo this commit.
+""")
 
     def widget_with_context(self, domain, conditions):
         ch = SelectRowsContextHandler()