auth_oidc: configure claims widget through subclass (#53442)

src/authentic2_auth_oidc/forms.py

@@ -32,13 +32,12 @@ class OIDCProviderEditForm(forms.ModelForm):
         self.fields['ou'].empty_label = None
 
 
-class OIDCClaimMappingForm(forms.ModelForm):
+class OIDCClaimTextInput(DatalistTextInput):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        claim_widget = self.fields['claim'].widget
         # fill datalist with standard claims from
         # https://openid.net/specs/openid-connect-core-1_0.html#StandardClaims
-        claim_widget.data = (
+        self.data = (
             'sub',
             'name',
             'given_name',
@@ -59,9 +58,13 @@ class OIDCClaimMappingForm(forms.ModelForm):
             'address',
             'updated_at',
         )
-        claim_widget.name = 'list__oidcclaim-mapping-inline'
-        claim_widget.attrs.update({'list': 'list__oidcclaim-mapping-inline'})
+        self.name = 'list__oidcclaim-mapping-inline'
+        self.attrs.update({'list': 'list__oidcclaim-mapping-inline'})
 
+
+class OIDCClaimMappingForm(forms.ModelForm):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
         self.fields['attribute'].widget = SelectAttributeWidget()
 
     class Meta:
@@ -75,5 +78,5 @@ class OIDCClaimMappingForm(forms.ModelForm):
         ]
         readonly_fields = ['created', 'modified']
         widgets = {
-            'claim': DatalistTextInput,
+            'claim': OIDCClaimTextInput,
         }