Custom link cleanup

netbox/extras/models.py

@@ -304,6 +304,13 @@ class CustomFieldChoice(models.Model):
 # Custom links
 #
 
+def get_custom_link_models():
+    # TODO: This should match on the app_label as well as the model name to avoid potential duplicate names
+    return {
+        'model__in': [model.split('.')[1] for model in CUSTOM_LINK_MODELS],
+    }
+
+
 class CustomLink(models.Model):
     """
     A custom link to an external representation of a NetBox object. The link text and URL fields accept Jinja2 template
@@ -311,7 +318,8 @@ class CustomLink(models.Model):
     """
     content_type = models.ForeignKey(
         to=ContentType,
-        on_delete=models.CASCADE
+        on_delete=models.CASCADE,
+        limit_choices_to=get_custom_link_models
     )
     name = models.CharField(
         max_length=100,
@@ -319,22 +327,26 @@ class CustomLink(models.Model):
     )
     text = models.CharField(
         max_length=200,
-        help_text="Template code for link text"
+        help_text="Jinja2 template code for link text"
     )
     url = models.CharField(
         max_length=200,
-        help_text="Template code for link URL"
+        verbose_name='URL',
+        help_text="Jinja2 template code for link URL"
     )
     weight = models.PositiveSmallIntegerField(
         default=100
     )
     group_name = models.CharField(
         max_length=50,
-        blank=True
+        blank=True,
+        help_text="Links with the same group will appear as a dropdown menu"
     )
     button_class = models.CharField(
         max_length=30,
-        choices=BUTTON_CLASS_CHOICES
+        choices=BUTTON_CLASS_CHOICES,
+        default=BUTTON_CLASS_DEFAULT,
+        help_text="The class of the first link in a group will be used for the dropdown button"
     )
     new_window = models.BooleanField(
         help_text="Force link to open in a new window"