.

djangorota/rota/forms.py

@@ -334,9 +334,32 @@ class ShiftForm(forms.Form):
         help_text="Maximum allowed difference in allocated shifts for this shift (leave blank for default)",
     )
 
+    # Allow entering shift-specific constraints as JSON. This should be a
+    # list of constraint dicts compatible with the scheduler's SingleShift
+    # `constraints` field. Example: `[{"name": "night", "options": {...}}]`
+    constraints = forms.CharField(
+        required=False,
+        widget=forms.Textarea(attrs={"rows": 4, "class": "textarea"}),
+        help_text="Optional JSON list of constraint objects for this shift (e.g. [{'name':'night','options':{}}])",
+    )
+
     def clean_sites(self):
         val = self.cleaned_data["sites"]
         sites = [s.strip() for s in val.split(",") if s.strip()]
         if not sites:
             raise forms.ValidationError("At least one site is required")
         return sites
+
+    def clean_constraints(self):
+        val = self.cleaned_data.get("constraints")
+        if not val:
+            return []
+        try:
+            parsed = json.loads(val)
+            if not isinstance(parsed, list):
+                raise forms.ValidationError("Constraints must be a JSON list of constraint objects")
+            return parsed
+        except forms.ValidationError:
+            raise
+        except Exception as exc:
+            raise forms.ValidationError(f"Invalid JSON for constraints: {exc}")