Prune empty data from instance updates aswell

Closes #124

src/servala/core/models/service.py

@@ -305,6 +305,31 @@ def validate_api_definition(value):
     return validate_dict(value, required_fields)
 
 
+def prune_empty_data(data):
+    """
+    Recursively remove empty values from dictionaries and lists.
+    Empty values include: None, empty strings, empty lists, empty dicts.
+    """
+
+    def is_empty(value):
+        return value is None or value == "" or value == [] or value == {}
+
+    if isinstance(data, dict):
+        return {
+            key: pruned_value
+            for key, value in data.items()
+            if not is_empty(pruned_value := prune_empty_data(value))
+        }
+    elif isinstance(data, list):
+        return [
+            pruned_item
+            for item in data
+            if not is_empty(pruned_item := prune_empty_data(item))
+        ]
+    else:
+        return data
+
+
 class ServiceDefinition(ServalaModelMixin, models.Model):
     """
     Configuration/service implementation: contains information on which
@@ -568,6 +593,16 @@ class ServiceInstance(ServalaModelMixin, models.Model):
             if key in attrs:
                 delattr(self, key)
 
+    @classmethod
+    def _prepare_spec_data(cls, spec_data):
+        """
+        Prepare spec data by pruning empty values and ensuring required fields.
+        This method centralizes spec data processing to ensure consistency.
+        """
+        spec_data = spec_data or {}
+        spec_data = prune_empty_data(spec_data)
+        return spec_data
+
     @classmethod
     def create_instance(cls, name, organization, context, created_by, spec_data):
         # Ensure the namespace exists
@@ -587,7 +622,8 @@ class ServiceInstance(ServalaModelMixin, models.Model):
             )
 
         try:
-            spec_data = spec_data or {}
+            spec_data = cls._prepare_spec_data(spec_data)
+
             if "writeConnectionSecretToRef" not in spec_data:
                 spec_data["writeConnectionSecretToRef"] = {}
 
@@ -629,6 +665,7 @@ class ServiceInstance(ServalaModelMixin, models.Model):
 
     def update_spec(self, spec_data, updated_by):
         try:
+            spec_data = self._prepare_spec_data(spec_data)
             api_instance = self.context.control_plane.custom_objects_api
             patch_body = {"spec": spec_data}