user-APIs: forbid setting non-existing attribute

CHANGES.rst

@@ -57,6 +57,9 @@ API Changes
 
 - Deprecated ``app.get_subsets_from_viewer`` is removed, use ``viz_helper.get_subsets`` instead. [#2578]
 
+- User APIs now raise a warning when attempting to set a non-existing attribute to avoid confusion
+  caused by typos, etc. [#2577]
+
 Cubeviz
 ^^^^^^^
 

jdaviz/configs/default/plugins/markers/tests/test_markers_plugin.py

@@ -136,7 +136,7 @@ def test_markers_layer_cycle(self):
         label_mouseover = self.imviz.app.session.application._tools['g-coords-info']
 
         mp = self.imviz.plugins['Markers']
-        mp.plugin_opened = True
+        mp._obj.plugin_opened = True
 
         # cycle through dataset options (used for both coords info and markers)
         assert label_mouseover.dataset.choices == ['auto', 'none',
@@ -217,7 +217,7 @@ def test_markers_custom_viewer(self):
         label_mouseover = self.imviz.app.session.application._tools['g-coords-info']
 
         mp = self.imviz.plugins['Markers']
-        mp.plugin_opened = True
+        mp._obj.plugin_opened = True
 
         nv = self.imviz.create_image_viewer()
         self.imviz.app.add_data_to_viewer('imviz-1', 'has_wcs[SCI,1]')

jdaviz/configs/default/plugins/model_fitting/tests/test_plugin.py

@@ -51,7 +51,7 @@ def test_custom_model_labels(specviz_helper, spectrum1d):
 
     for i, model in enumerate(MODELS):
         # Add one of each model with a unique name
-        modelfit_plugin.model_comp_selected = model
+        modelfit_plugin._obj.model_comp_selected = model
         modelfit_plugin._obj.comp_label = f"test_model_{i}"
         modelfit_plugin._obj.vue_add_model({})
 
@@ -159,7 +159,7 @@ def test_refit_plot_options(specviz_helper, spectrum1d):
     specviz_helper.load_data(spectrum1d)
     modelfit_plugin = specviz_helper.plugins['Model Fitting']
 
-    modelfit_plugin.model_comp_selected = 'Const1D'
+    modelfit_plugin._obj.model_comp_selected = 'Const1D'
     modelfit_plugin._obj.comp_label = "C"
     modelfit_plugin._obj.vue_add_model({})
 
@@ -190,6 +190,9 @@ def test_user_api(specviz_helper, spectrum1d):
         specviz_helper.load_data(spectrum1d)
     p = specviz_helper.plugins['Model Fitting']
 
+    with pytest.raises(ValueError, match="blah is not a valid attribute and cannot be set"):
+        p.blah = 5
+
     # even though the default label is set to C, adding Linear1D should default to its automatic
     # default label of 'L'
     assert p.model_component == 'Const1D'  # tests SelectPluginComponent's __eq__

jdaviz/configs/imviz/tests/test_catalogs.py

@@ -91,7 +91,7 @@ def test_plugin_image_with_result(self, imviz_helper, tmp_path):
         self.imviz = imviz_helper
 
         catalogs_plugin = self.imviz.app.get_tray_item_from_name('imviz-catalogs')
-        catalogs_plugin.plugin_opened = True
+        catalogs_plugin._obj.plugin_opened = True
         # This basically calls the following under the hood:
         #   skycoord_center = SkyCoord(6.62754354, 1.54466139, unit="deg")
         #   zoom_radius = r_max = 3 * u.arcmin

jdaviz/configs/imviz/tests/test_tools.py

@@ -133,7 +133,7 @@ def test_blink(imviz_helper):
 
 def test_compass_open_while_load(imviz_helper):
     plg = imviz_helper.plugins['Compass']
-    plg.plugin_opened = True
+    plg._obj.plugin_opened = True
 
     # Should not crash even if Compass is open in tray.
     imviz_helper.load_data(np.ones((2, 2)))

jdaviz/core/user_api.py

@@ -34,8 +34,10 @@ def __getattr__(self, attr):
         return getattr(exp_obj, 'user_api', exp_obj)
 
     def __setattr__(self, attr, value):
-        if attr in _internal_attrs or attr not in self._expose:
+        if attr in _internal_attrs:
             return super().__setattr__(attr, value)
+        if attr not in self._expose:
+            raise ValueError(f"{attr} is not a valid attribute and cannot be set")
 
         if attr in self._readonly:
             raise AttributeError("cannot set read-only item")