Initial work on #5883

netbox/extras/forms/config.py

@@ -0,0 +1,67 @@
+from django import forms
+
+from netbox.config.parameters import PARAMS
+
+__all__ = (
+    'ConfigRevisionForm',
+)
+
+
+EMPTY_VALUES = ('', None, [], ())
+
+
+class FormMetaclass(forms.models.ModelFormMetaclass):
+
+    def __new__(mcs, name, bases, attrs):
+
+        # Emulate a declared field for each supported configuration parameter
+        param_fields = {}
+        for param in PARAMS:
+            help_text = f'{param.description}<br />' if param.description else ''
+            # help_text += f'Current value: <strong>{getattr(settings, param.name)}</strong>'
+            param_fields[param.name] = param.field(
+                required=False,
+                label=param.label,
+                help_text=help_text,
+                **param.field_kwargs
+            )
+        attrs.update(param_fields)
+
+        return super().__new__(mcs, name, bases, attrs)
+
+
+class ConfigRevisionForm(forms.BaseModelForm, metaclass=FormMetaclass):
+    """
+    Form for creating a new ConfigRevision.
+    """
+    class Meta:
+        widgets = {
+            'comment': forms.Textarea(),
+        }
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Bugfix for django-timezone-field: Add empty choice to default options
+        # self.fields['TIME_ZONE'].choices = [('', ''), *self.fields['TIME_ZONE'].choices]
+
+    def save(self, commit=True):
+        instance = super().save(commit=False)
+
+        # Populate JSON data on the instance
+        instance.data = self.render_json()
+
+        if commit:
+            instance.save()
+
+        return instance
+
+    def render_json(self):
+        json = {}
+
+        # Iterate through each field and populate non-empty values
+        for field_name in self.declared_fields:
+            if field_name in self.cleaned_data and self.cleaned_data[field_name] not in EMPTY_VALUES:
+                json[field_name] = self.cleaned_data[field_name]
+
+        return json