[bug] input_type is not passed when text embedding

[utsumi-fj]

Description

The variable data.input_type, which stores either EmbeddingInputType.DOCUMENT or EmbeddingInputType.QUERY, is not passed when executing text embedding.

data.input_type should be passed to model_instance.invoke located here:
https://github.com/langgenius/dify-plugin-sdks/blob/0.6.1/python/dify_plugin/core/plugin_executor.py#L213

Background

When implementing a custom _invoke method in the following plugin:
https://github.com/langgenius/dify-official-plugins/blob/main/models/openai_api_compatible/models/text_embedding/text_embedding.py

I attempted to check the value of input_type inside _invoke. However, input_type was always EmbeddingInputType.DOCUMENT, even when the request was actually a query.

This suggests that the correct input_type value is not being passed through to _invoke.

[Mairuis]

Hi @utsumi-fj,

Thank you for reporting this issue. After investigating the code across the entire pipeline, I can confirm this is indeed a bug.

Root Cause Analysis

The input_type parameter is correctly passed through Dify and the plugin daemon, but the SDK fails to receive and forward it:

Component	File	Has input_type?
Dify	core/plugin/impl/model.py:236-264	✅ Yes, passes to daemon
dify-plugin-daemon	pkg/entities/requests/model.go:35-38	✅ Yes, has InputType string field
dify-plugin-sdks	core/entities/plugin/request.py:199-203	❌ Missing!
dify-plugin-sdks	core/plugin_executor.py:210-218	❌ Not passed!

The Problem

In the SDK's ModelInvokeTextEmbeddingRequest class, the input_type field is missing:

class ModelInvokeTextEmbeddingRequest(PluginAccessModelRequest):
    action: ModelActions = ModelActions.InvokeTextEmbedding
    texts: list[str]
    # ❌ Missing: input_type field

And in plugin_executor.py, the input_type is not passed to the model's invoke method:

def invoke_text_embedding(self, session: Session, data: ModelInvokeTextEmbeddingRequest):
    return model_instance.invoke(
        data.model,
        data.credentials,
        data.texts,
        data.user_id,
        # ❌ Missing: input_type parameter
    )

This causes input_type to always default to EmbeddingInputType.DOCUMENT.

Thank you for your contribution with the fix PR! I will follow up on it.