构建工作流
LangChain Code node
n8n provides these methods to make it easier to perform common tasks in the LangChain Code node.
| Method | Description |
|---|---|
this.addInputData(inputName, data) |
Populate the data of a specified non-main input. Useful for mocking data.<code>inputName</code> is the input connection type, and must be one of: <code>ai\_agent</code>, <code>ai\_chain</code>, <code>ai\_document</code>, <code>ai\_embedding</code>, <code>ai\_languageModel</code>, <code>ai\_memory</code>, <code>ai\_outputParser</code>, <code>ai\_retriever</code>, <code>ai\_textSplitter</code>, <code>ai\_tool</code>, <code>ai\_vectorRetriever</code>, <code>ai\_vectorStore</code><code>data</code> contains the data you want to add. Refer to Data structure for information on the data structure expected by n8n. |
this.addOutputData(outputName, data) |
Populate the data of a specified non-main output. Useful for mocking data.<code>outputName</code> is the input connection type, and must be one of: <code>ai\_agent</code>, <code>ai\_chain</code>, <code>ai\_document</code>, <code>ai\_embedding</code>, <code>ai\_languageModel</code>, <code>ai\_memory</code>, <code>ai\_outputParser</code>, <code>ai\_retriever</code>, <code>ai\_textSplitter</code>, <code>ai\_tool</code>, <code>ai\_vectorRetriever</code>, <code>ai\_vectorStore</code><code>data</code> contains the data you want to add. Refer to Data structure for information on the data structure expected by n8n. |
this.getInputConnectionData(inputName, itemIndex, inputIndex?) |
Get data from a specified non-main input.<code>inputName</code> is the input connection type, and must be one of: <code>ai\_agent</code>, <code>ai\_chain</code>, <code>ai\_document</code>, <code>ai\_embedding</code>, <code>ai\_languageModel</code>, <code>ai\_memory</code>, <code>ai\_outputParser</code>, <code>ai\_retriever</code>, <code>ai\_textSplitter</code>, <code>ai\_tool</code>, <code>ai\_vectorRetriever</code>, <code>ai\_vectorStore</code><code>itemIndex</code> should always be <code>0</code> (this parameter will be used in upcoming functionality)Use <code>inputIndex</code> if there is more than one node connected to the specified input. |
this.getInputData(inputIndex?, inputName?) |
Get data from the main input. |
this.getNode() |
Get the current node. |
this.getNodeOutputs() |
Get the outputs of the current node. |
this.getExecutionCancelSignal() |
Use this to stop the execution of a function when the workflow stops. In most cases n8n handles this, but you may need to use it if building your own chains or agents. It replaces the Cancelling a running LLMChain code that you'd use if building a LangChain application normally. |
官方原文和授权
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