Select Rows: Fix crash on changed variable type

Orange/widgets/data/owselectrows.py

@@ -50,20 +50,31 @@ def encode_setting(self, context, setting, value):
                 if context.attributes.get(attr) == CONTINUOUS:
                     if values and isinstance(values[0], str):
                         values = [QLocale().toDouble(v)[0] for v in values]
-                        value[i] = (attr, op, values)
+                        value[i] = (attr, context.attributes[attr], op, values)
         return super().encode_setting(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):
+            for i, (attr, _, op, values) in enumerate(value):
                 var = attr in domain and domain[attr]
                 if var and var.is_continuous and not isinstance(var, TimeVariable):
                     value[i] = (attr, op,
                                 list([QLocale().toString(float(i), 'f')
                                       for i in values]))
         return value
 
+    def match(self, context, domain, attrs, metas):
+        if (attrs, metas) == (context.attributes, context.metas):
+            return self.PERFECT_MATCH
+
+        conditions = context.values["conditions"]
+        all_vars = attrs
+        all_vars.update(metas)
+        if all(all_vars.get(name) == tpe for name, tpe, *_ in conditions):
+            return 0.5
+        return self.NO_MATCH
+
 
 class FilterDiscreteType(enum.Enum):
     Equal = "Equal"
@@ -105,6 +116,8 @@ class Outputs:
     purge_classes = Setting(False, schema_only=True)
     auto_commit = Setting(True)
 
+    settings_version = 1
+
     Operators = {
         ContinuousVariable: [
             (FilterContinuous.Equal, "equals"),
@@ -692,6 +705,12 @@ 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"] = []
+
 
 class CheckBoxPopup(QWidget):
     def __init__(self, var, lc, widget_parent=None, widget=None):

Orange/widgets/data/tests/test_owselectrows.py

@@ -7,7 +7,7 @@
 import numpy as np
 
 from Orange.data import (
-    Table, ContinuousVariable, StringVariable, DiscreteVariable)
+    Table, ContinuousVariable, StringVariable, DiscreteVariable, Domain)
 from Orange.widgets.data.owselectrows import (
     OWSelectRows, FilterDiscreteType, SelectRowsContextHandler)
 from Orange.widgets.tests.base import WidgetTest, datasets
@@ -16,6 +16,7 @@
 from Orange.widgets.tests.utils import simulate, override_locale
 from Orange.widgets.utils.annotated_data import ANNOTATED_DATA_FEATURE_NAME
 from Orange.tests import test_filename
+from orangewidget.settings import VERSION_KEY
 
 CFValues = {
     FilterContinuous.Equal: ["5.4"],
@@ -132,22 +133,22 @@ def test_stores_settings_in_invariant_locale(self):
         context = self.widget.current_context
         self.send_signal(self.widget.Inputs.data, None)
         saved_condition = context.values["conditions"][0]
-        self.assertEqual(saved_condition[2][0], 5.2)
+        self.assertEqual(saved_condition[3][0], 5.2)
 
     @override_locale(QLocale.C)
     def test_restores_continuous_filter_in_c_locale(self):
         iris = Table("iris")[:5]
         # Settings with string value
         self.widget = self.widget_with_context(
-            iris.domain, [["sepal length", 2, ("5.2",)]])
+            iris.domain, [["sepal length", 102, 2, ("5.2",)]])
         self.send_signal(self.widget.Inputs.data, iris)
 
         values = self.widget.conditions[0][2]
         self.assertTrue(values[0].startswith("5.2"))
 
         # Settings with float value
         self.widget = self.widget_with_context(
-            iris.domain, [["sepal length", 2, (5.2,)]])
+            iris.domain, [["sepal length", 102, 2, (5.2,)]])
         self.send_signal(self.widget.Inputs.data, iris)
 
         values = self.widget.conditions[0][2]
@@ -158,15 +159,15 @@ def test_restores_continuous_filter_in_sl_SI_locale(self):
         iris = Table("iris")[:5]
         # Settings with string value
         self.widget = self.widget_with_context(
-            iris.domain, [["sepal length", 2, ("5.2",)]])
+            iris.domain, [["sepal length", 102, 2, ("5.2",)]])
         self.send_signal(self.widget.Inputs.data, iris)
 
         values = self.widget.conditions[0][2]
         self.assertTrue(values[0].startswith("5,2"))
 
         # Settings with float value
         self.widget = self.widget_with_context(
-            iris.domain, [["sepal length", 2, (5.2,)]])
+            iris.domain, [["sepal length", 102, 2, (5.2,)]])
         self.send_signal(self.widget.Inputs.data, iris)
 
         values = self.widget.conditions[0][2]
@@ -242,10 +243,37 @@ def test_annotated_data(self):
         np.testing.assert_equal(annotations[:50], True)
         np.testing.assert_equal(annotations[50:], False)
 
+    def test_change_var_type(self):
+        iris = Table("iris")
+        domain = iris.domain
+
+        self.send_signal(self.widget.Inputs.data, iris)
+        self.widget.remove_all_button.click()
+        self.enterFilter(domain[0], "is below", "5.2")
+
+        var0vals = list({str(x) for x in iris.X[:, 0]})
+        new_domain = Domain(
+            (DiscreteVariable(domain[0].name, values=var0vals), )
+            + domain.attributes[1:],
+            domain.class_var)
+        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")
+
+        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, [])
+
     def widget_with_context(self, domain, conditions):
         ch = SelectRowsContextHandler()
         context = ch.new_context(domain, *ch.encode_domain(domain))
-        context.values = dict(conditions=conditions)
+        context.values = {"conditions": conditions,
+                          VERSION_KEY: OWSelectRows.settings_version}
         settings = dict(context_settings=[context])
 
         return self.create_widget(OWSelectRows, settings)