updated filter-for attr handling

netbox/dcim/forms.py

@@ -2241,10 +2241,11 @@ class CableCreateForm(BootstrapMixin, ChainedFieldsMixin, forms.ModelForm):
         queryset=Site.objects.all(),
         label='Site',
         required=False,
-        widget=forms.Select(
-            attrs={
-                'data-filter-for-termination_b_rack': 'site_id',
-                'data-filter-for-termination_b_device': 'site_id',
+        widget=APISelect(
+            api_url='/api/dcim/sites/',
+            filter_for={
+                'termination_b_rack': 'site_id',
+                'termination_b_device': 'site_id',
             }
         )
     )
@@ -2257,8 +2258,10 @@ class CableCreateForm(BootstrapMixin, ChainedFieldsMixin, forms.ModelForm):
         required=False,
         widget=APISelect(
             api_url='/api/dcim/racks/',
+            filter_for={
+                'termination_b_device': 'rack_id',
+            },
             attrs={
-                'data-filter-for-termination_b_device': 'rack_id',
                 'nullable': 'true',
             }
         )
@@ -2270,23 +2273,15 @@ class CableCreateForm(BootstrapMixin, ChainedFieldsMixin, forms.ModelForm):
             ('rack', 'termination_b_rack'),
         ),
         label='Device',
+        required=False,
         widget=APISelect(
             api_url='/api/dcim/devices/',
             display_field='display_name',
-            attrs={
-                'data-filter-for-termination_b_id': 'device_id',
+            filter_for={
+                'termination_b_id': 'device_id',
             }
         )
     )
-    livesearch = forms.CharField(
-        required=False,
-        label='Device',
-        widget=Livesearch(
-            query_key='q',
-            query_url='dcim-api:device-list',
-            field_to_update='termination_b_device'
-        )
-    )
     termination_b_type = forms.ModelChoiceField(
         queryset=ContentType.objects.all(),
         label='Type',

netbox/utilities/forms.py

@@ -238,6 +238,8 @@ class APISelect(SelectWithDisabled):
     :param api_url: API URL
     :param display_field: (Optional) Field to display for child in selection list. Defaults to `name`.
     :param disabled_indicator: (Optional) Mark option as disabled if this field equates true.
+    :param filter_for: (Optional) A dict of chained form fields for which this field is a filter. The key is the
+        name of the filter-for field (child field) and the value is the name of the query param filter.
     :param conditional_query_params: (Optional) A dict of URL query params to append to the URL if the
         condition is met. The condition is the dict key and is specified in the form `<field_name>__<field_value>`.
         If the provided field value is selected for the given field, the URL query param will be appended to
@@ -252,6 +254,7 @@ class APISelect(SelectWithDisabled):
         api_url,
         display_field=None,
         disabled_indicator=None,
+        filter_for=None,
         conditional_query_params=None,
         additional_query_params=None,
         *args,
@@ -266,6 +269,9 @@ class APISelect(SelectWithDisabled):
             self.attrs['display-field'] = display_field
         if disabled_indicator:
             self.attrs['disabled-indicator'] = disabled_indicator
+        if filter_for:
+            for key, value in filter_for.items():
+                self.add_filter_for(key, value) 
         if conditional_query_params:
             for key, value in conditional_query_params.items():
                 self.add_conditional_query_param(key, value)
@@ -273,6 +279,15 @@ class APISelect(SelectWithDisabled):
             for key, value in additional_query_params.items():
                 self.add_additional_query_param(key, value)
 
+    def add_filter_for(self, name, value):
+        """
+        Add details for an additional query param in the form of a data-filter-for-* attribute.
+
+        :param name: The name of the query param
+        :param value: The value of the query param
+        """
+        self.attrs['data-filter-for-{}'.format(name)] = value
+
     def add_additional_query_param(self, name, value):
         """
         Add details for an additional query param in the form of a data-* attribute.