feat: add utility to insert code field into build config dictionary (#8933)

feat: add code field to build configuration in custom component update if it was removed

- Introduced `add_code_field_to_build_config` utility function to enhance build configuration with a code field.
- Updated `custom_component_update` to conditionally add the code field if it is not already present, improving component customization capabilities.

Co-authored-by: Edwin Jose <edwin.jose@datastax.com>

src/backend/base/langflow/api/v1/endpoints.py

@@ -27,7 +27,12 @@ from langflow.api.v1.schemas import (
     UploadFileResponse,
 )
 from langflow.custom.custom_component.component import Component
-from langflow.custom.utils import build_custom_component_template, get_instance_name, update_component_build_config
+from langflow.custom.utils import (
+    add_code_field_to_build_config,
+    build_custom_component_template,
+    get_instance_name,
+    update_component_build_config,
+)
 from langflow.events.event_manager import create_stream_tokens_event_manager
 from langflow.exceptions.api import APIException, InvalidChatInputError
 from langflow.exceptions.serialization import SerializationError
@@ -727,6 +732,8 @@ async def custom_component_update(
             field_value=code_request.field_value,
             field_name=code_request.field,
         )
+        if "code" not in updated_build_config:
+            updated_build_config = add_code_field_to_build_config(updated_build_config, code_request.code)
         component_node["template"] = updated_build_config
 
         if isinstance(cc_instance, Component):

src/backend/base/langflow/custom/utils.py

@@ -398,6 +398,22 @@ def add_code_field(frontend_node: CustomComponentFrontendNode, raw_code):
     return frontend_node
 
 
+def add_code_field_to_build_config(build_config: dict, raw_code: str):
+    build_config["code"] = Input(
+        dynamic=True,
+        required=True,
+        placeholder="",
+        multiline=True,
+        value=raw_code,
+        password=False,
+        name="code",
+        advanced=True,
+        field_type="code",
+        is_list=False,
+    ).model_dump()
+    return build_config
+
+
 def build_custom_component_template_from_inputs(
     custom_component: Component | CustomComponent, user_id: str | UUID | None = None
 ):