Plugin missing fix (#5653)

* Add 'is_installed' property to PluginConfig model

- Allow us to show users which plugins are "outdated"

* Cleanup plugin table

- Display clearly if a plugin is no longer installed

* Fixes for plugin table

* Revert change due to failing CI

InvenTree/plugin/api.py

@@ -83,6 +83,18 @@ class PluginList(ListAPI):
 
             queryset = queryset.filter(pk__in=matches)
 
+        # Filter queryset by 'installed' flag
+        if 'installed' in params:
+            installed = str2bool(params['installed'])
+
+            matches = []
+
+            for result in queryset:
+                if result.is_installed() == installed:
+                    matches.append(result.pk)
+
+            queryset = queryset.filter(pk__in=matches)
+
         return queryset
 
     filter_backends = SEARCH_ORDER_FILTER

InvenTree/plugin/models.py

@@ -104,9 +104,9 @@ class PluginConfig(InvenTree.models.MetadataMixin, models.Model):
         self.plugin: InvenTreePlugin = plugin
 
     def __getstate__(self):
-        """Customize pickeling behaviour."""
+        """Customize pickling behavior."""
         state = super().__getstate__()
-        state.pop("plugin", None)  # plugin cannot be pickelt in some circumstances when used with drf views, remove it (#5408)
+        state.pop("plugin", None)  # plugin cannot be pickled in some circumstances when used with drf views, remove it (#5408)
         return state
 
     def save(self, force_insert=False, force_update=False, *args, **kwargs):
@@ -120,14 +120,23 @@ class PluginConfig(InvenTree.models.MetadataMixin, models.Model):
             self.active = True
 
         if not reload:
-            if (self.active is False and self.__org_active is True) or \
+            if self.active != self.__org_active:
-               (self.active is True and self.__org_active is False):
                 if settings.PLUGIN_TESTING:
                     warnings.warn('A reload was triggered', stacklevel=2)
                 registry.reload_plugins()
 
         return ret
 
+    @admin.display(boolean=True, description=_('Installed'))
+    def is_installed(self) -> bool:
+        """Simple check to determine if this plugin is installed.
+
+        A plugin might not be installed if it has been removed from the system,
+        but the PluginConfig associated with it still exists.
+        """
+
+        return self.plugin is not None
+
     @admin.display(boolean=True, description=_('Sample plugin'))
     def is_sample(self) -> bool:
         """Is this plugin a sample app?"""

InvenTree/plugin/serializers.py

@@ -56,12 +56,14 @@ class PluginConfigSerializer(serializers.ModelSerializer):
             'mixins',
             'is_builtin',
             'is_sample',
+            'is_installed',
         ]
 
         read_only_fields = [
             'key',
             'is_builtin',
             'is_sample',
+            'is_installed',
         ]
 
     meta = serializers.DictField(read_only=True)

InvenTree/templates/js/translated/plugin.js

@@ -45,34 +45,24 @@ function loadPluginTable(table, options={}) {
             return '{% trans "No plugins found" %}';
         },
         columns: [
-            {
-                field: 'active',
-                title: '',
-                sortable: true,
-                formatter: function(value, row) {
-                    if (row.active) {
-                        return `<span class='fa fa-check-circle icon-green' title='{% trans "This plugin is active" %}'></span>`;
-                    } else {
-                        return `<span class='fa fa-times-circle icon-red' title ='{% trans "This plugin is not active" %}'></span>`;
-                    }
-                }
-            },
             {
                 field: 'name',
-                title: '{% trans "Plugin Description" %}',
+                title: '{% trans "Plugin" %}',
                 sortable: true,
+                switchable: false,
                 formatter: function(value, row) {
                     let html = '';
 
-                    if (row.active) {
+                    if (!row.is_installed) {
-                        html += `<strong>${value}</strong>`;
+                        html += `<span class='fa fa-question-circle' title='{% trans "This plugin is no longer installed" %}'></span>`;
-                        if (row.meta && row.meta.description) {
+                    } else if (row.active) {
-                            html += ` - <small>${row.meta.description}</small>`;
+                        html += `<span class='fa fa-check-circle icon-green' title='{% trans "This plugin is active" %}'></span>`;
-                        }
                     } else {
-                        html += `<em>${value}</em>`;
+                        html += `<span class='fa fa-times-circle icon-red' title ='{% trans "This plugin is installed but not active" %}'></span>`;
                     }
 
+                    html += `&nbsp;<span>${value}</span>`;
+
                     if (row.is_builtin) {
                         html += `<span class='badge bg-success rounded-pill badge-right'>{% trans "Builtin" %}</span>`;
                     }
@@ -84,6 +74,12 @@ function loadPluginTable(table, options={}) {
                     return html;
                 }
             },
+            {
+                field: 'meta.description',
+                title: '{% trans "Description" %}',
+                sortable: false,
+                switchable: true,
+            },
             {
                 field: 'meta.version',
                 title: '{% trans "Version" %}',
@@ -104,15 +100,18 @@ function loadPluginTable(table, options={}) {
             {
                 field: 'meta.author',
                 title: '{% trans "Author" %}',
+                sortable: false,
             },
             {
                 field: 'actions',
                 title: '',
+                switchable: false,
+                sortable: false,
                 formatter: function(value, row) {
                     let buttons = '';
 
                     // Check if custom plugins are enabled for this instance
-                    if (options.custom && !row.is_builtin) {
+                    if (options.custom && !row.is_builtin && row.is_installed) {
                         if (row.active) {
                             buttons += makeIconButton('fa-stop-circle icon-red', 'btn-plugin-disable', row.pk, '{% trans "Disable Plugin" %}');
                         } else {

InvenTree/templates/js/translated/table_filters.js

@@ -471,6 +471,10 @@ function getPluginTableFilters() {
             type: 'bool',
             title: '{% trans "Sample" %}',
         },
+        installed: {
+            type: 'bool',
+            title: '{% trans "Installed" %}'
+        },
     };
 }