Add options for spectacular

src/backend/InvenTree/InvenTree/setting/spectacular.py

@@ -28,10 +28,9 @@ def get_spectacular_settings():
             'UserTypeEnum': 'users.models.UserProfile.UserType',
             'TemplateModelTypeEnum': 'report.models.ReportTemplateBase.ModelChoices',
             'AttachmentModelTypeEnum': 'common.models.Attachment.ModelChoices',
+            'ParameterModelTypeEnum': 'common.models.Parameter.ModelChoices',
+            'ParameterTemplateModelTypeEnum': 'common.models.ParameterTemplate.ModelChoices',
             'DataImportSessionModelTypeEnum': 'importer.models.DataImportSession.ModelChoices',
-            # Deconflict fields which use model_type ContentType fields
-            'common.models.Parameter.model_type': 'ParameterModelTypeEnum',
-            'common.models.ParameterTemplate.model_type': 'ParameterTemplateModelTypeEnum',
             # Allauth
             'UnauthorizedStatus': [[401, 401]],
             'IsTrueEnum': [[True, True]],

src/backend/InvenTree/common/models.py

@@ -2387,6 +2387,11 @@ class ParameterTemplate(
         verbose_name = _('Parameter Template')
         verbose_name_plural = _('Parameter Templates')
 
+    class ModelChoices(RenderChoices):
+        """Model choices for parameters."""
+
+        choice_fnc = common.validators.parameter_template_model_options
+
     @staticmethod
     def get_api_url() -> str:
         """Return the API URL associated with the ParameterTemplate model."""
@@ -2574,6 +2579,11 @@ class Parameter(
 
         indexes = [models.Index(fields=['model_type', 'model_id'])]
 
+    class ModelChoices(RenderChoices):
+        """Model choices for parameters."""
+
+        choice_fnc = common.validators.parameter_model_options
+
     @staticmethod
     def get_api_url() -> str:
         """Return the API URL associated with the Parameter model."""

src/backend/InvenTree/common/validators.py

@@ -9,6 +9,35 @@ import common.icons
 from common.settings import get_global_setting
 
 
+def parameter_model_types():
+    """Return a list of valid parameter model choices."""
+    import InvenTree.models
+
+    return list(
+        InvenTree.helpers_model.getModelsWithMixin(
+            InvenTree.models.InvenTreeParameterMixin
+        )
+    )
+
+
+def parameter_model_options():
+    """Return a list of options for models which support parameters."""
+    return [
+        (model.__name__.lower(), model._meta.verbose_name)
+        for model in parameter_model_types()
+    ]
+
+
+def parameter_template_model_options():
+    """Return a list of options for models which support parameter templates."""
+    options = [
+        (model.__name__.lower(), model._meta.verbose_name)
+        for model in parameter_model_types()
+    ]
+
+    return [(None, _('All models')), *options]
+
+
 def attachment_model_types():
     """Return a list of valid attachment model choices."""
     import InvenTree.models