Issue with Loading Custom Components in Langflow UI

[adarshsingh2]

Describe the bug I'm encountering an issue where custom components in Langflow are not loading correctly due to conflicts in component identification. It seems that Langflow uses the return type of components to identify each component. However, if multiple components have the same return type, they overwrite each other on the UI.

Browser and Version

• Browser chrome
• Version [0.6.9]

To Reproduce Steps to reproduce the behavior: 1-Log in to the Langflow UI. 2-Check the requests made to {your_langchain_url}/api/v1/all. 3-Analyze the response to see the UI definition, particularly the custom_components section. 4-Notice that the return types of custom components are used as keys, potentially leading to conflicts.

Additional context Suspected culprit - src\backend\langflow\interface\custom\directory_reader\directory_reader.py

            if validation_result:
                try:
                    **output_types = self.get_output_types_from_code(result_content)**
                except Exception as exc:
                    logger.exception(f"Error while getting output types from code: {str(exc)}")
                    output_types = [component_name_camelcase]
            else:
                output_types = [component_name_camelcase]

[dosubot[bot]]

Hey @adarshsingh2, great to see you back! Running into more adventures in the world of Langflow, I see. 🚀

To resolve the issue of custom components in Langflow not loading correctly due to conflicts in component identification, where multiple components with the same return type overwrite each other on the UI, you need to ensure that each component has a unique identifier. This can be achieved by adding a unique name attribute to each custom component class. The name attribute acts as a unique identifier for the component in the Langflow UI, preventing conflicts between components with the same return type.

Here's how you can modify your CustomComponent.py to include a unique name attribute:

from langflow import CustomComponent
from langflow.field_typing import Data


class Component(CustomComponent):
    name: str = "UniqueComponentName"  # Ensure this name is unique across all components
    documentation: str = "http://docs.langflow.org/components/custom"

    def build_config(self):
        return {"param": {"display_name": "Parameter"}}

    def build(self, param: Data) -> Data:
        return param

In the modified code, the name attribute is set to "UniqueComponentName". You should replace "UniqueComponentName" with an actual unique name that describes your component. This change will help Langflow to differentiate between multiple custom components, even if they have the same return type, thus resolving the issue of components overwriting each other on the UI.

As for how Langflow identifies and differentiates between custom components in the UI, it does so by wrapping and extending the functionality of the components provided by @radix-ui/react-select. Each custom component is defined by forwarding refs and spreading props to the base components from @radix-ui/react-select, allowing for additional customization and styling. The differentiation is achieved through the creation of distinct components such as SelectTrigger, SelectContent, SelectLabel, SelectItem, and SelectSeparator, each serving a specific purpose within the UI and being styled individually using the cn utility function for conditional class names. This approach enables the creation of a cohesive and customizable select UI component structure.

You can find more details in the source code:

• CustomComponent.py
• select-custom.tsx

I hope this helps! If you have any more questions or need further clarification, feel free to ask.

Sources

• src/backend/langflow/components/custom_components/CustomComponent.py
• src/frontend/src/components/ui/select-custom.tsx

About Dosu

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Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

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[adarshsingh2]

Adding unique name field didn't make any difference.

Hey @adarshsingh2, great to see you back! Running into more adventures in the world of Langflow, I see. 🚀

To resolve the issue of custom components in Langflow not loading correctly due to conflicts in component identification, where multiple components with the same return type overwrite each other on the UI, you need to ensure that each component has a unique identifier. This can be achieved by adding a unique name attribute to each custom component class. The name attribute acts as a unique identifier for the component in the Langflow UI, preventing conflicts between components with the same return type.

Here's how you can modify your CustomComponent.py to include a unique name attribute:

from langflow import CustomComponent
from langflow.field_typing import Data


class Component(CustomComponent):
    name: str = "UniqueComponentName"  # Ensure this name is unique across all components
    documentation: str = "http://docs.langflow.org/components/custom"

    def build_config(self):
        return {"param": {"display_name": "Parameter"}}

    def build(self, param: Data) -> Data:
        return param

In the modified code, the name attribute is set to "UniqueComponentName". You should replace "UniqueComponentName" with an actual unique name that describes your component. This change will help Langflow to differentiate between multiple custom components, even if they have the same return type, thus resolving the issue of components overwriting each other on the UI.

As for how Langflow identifies and differentiates between custom components in the UI, it does so by wrapping and extending the functionality of the components provided by @radix-ui/react-select. Each custom component is defined by forwarding refs and spreading props to the base components from @radix-ui/react-select, allowing for additional customization and styling. The differentiation is achieved through the creation of distinct components such as SelectTrigger, SelectContent, SelectLabel, SelectItem, and SelectSeparator, each serving a specific purpose within the UI and being styled individually using the cn utility function for conditional class names. This approach enables the creation of a cohesive and customizable select UI component structure.

You can find more details in the source code:

• CustomComponent.py
• select-custom.tsx

I hope this helps! If you have any more questions or need further clarification, feel free to ask.

Sources

• src/backend/langflow/components/custom_components/CustomComponent.py
• src/frontend/src/components/ui/select-custom.tsx

About Dosu

This response is meant to be useful and save you time. It is not meant to be a precise solution, but rather a starting point for your own research.

Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

If you want to continue the conversation, start your reply with @dosu-bot.

Adding unique name field didn't make any difference.

[dosubot[bot]]

Thank you for providing the detailed steps to reproduce the issue and the suspected culprit code. It seems like the issue arises from the way Langflow identifies custom components based on their return types. If multiple components have the same return type, they overwrite each other on the UI, which is not the desired behavior.

To resolve this, you could consider implementing a unique identifier for each component that goes beyond the name attribute and the return type. This unique identifier could be a UUID or a combination of the name attribute and another distinguishing attribute.

Here's an example of how you could modify your custom component class to include a unique identifier:

import uuid
from langflow.interface.custom.base import CustomComponentCreator
from langflow.interface.custom.custom_component import CustomComponent as BaseCustomComponent

class CustomComponent(BaseCustomComponent):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Assign a unique identifier to each instance
        self.uuid = uuid.uuid4()

    def __eq__(self, other):
        # Components are considered equal if their classes and uuids are the same
        return isinstance(other, self.__class__) and self.uuid == other.uuid

    def __hash__(self):
        # The hash is based on the unique uuid
        return hash(self.uuid)

# Update the __init__.py to include the modified CustomComponent
__all__ = ["CustomComponentCreator", "CustomComponent"]

By implementing a unique identifier (uuid in this case) and overriding the __eq__ and __hash__ methods, each component instance is treated as unique based on its uuid, even if multiple components have the same return type. This should resolve the issue of components overwriting each other on the UI due to having the same return type.

Please note that this is a workaround and might not be the best solution. It would be better to have a more robust mechanism in Langflow to handle component identification, especially when dealing with custom components. I would recommend raising this issue with the Langflow team for a more permanent fix.

I hope this helps! If you have any other questions or need further clarification, feel free to ask.

Sources

• src/backend/langflow/interface/custom/init.py
• src/frontend/src/components/ui/select-custom.tsx

About Dosu

This response is meant to be useful and save you time. It is not meant to be a precise solution, but rather a starting point for your own research.

Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

If you want to continue the conversation, start your reply with @dosu-bot.

[pseudo-usama]

@adarshsingh2 Having the same problem. Did you find any solutions?

[adarshsingh2]

@adarshsingh2 Having the same problem. Did you find any solutions?

Yes, made changes in build method return type like below - def build( self, endpoint_url: str, repo_id: str, task: str, model_kwargs: Optional[Dict] = None, ) -> Union[MyCustomLLM, BaseLLM]:

[pseudo-usama]

They have fixed this issue in latest commit. As you can see here there is a function that determines component name code link.