langchain_core.prompts.base.aformat_document¶

async langchain_core.prompts.base.aformat_document(doc: Document, prompt: BasePromptTemplate[str]) → str[source]¶

Format a document into a string based on a prompt template.

First, this pulls information from the document from two sources:

  1. page_content:

    This takes the information from the document.page_content and assigns it to a variable named page_content.

  2. metadata:

    This takes information from document.metadata and assigns it to variables of the same name.

Those variables are then passed into the prompt to produce a formatted string.

Parameters

  • doc (Document) – Document, the page_content and metadata will be used to create the final string.

  • prompt (BasePromptTemplate[str]) – BasePromptTemplate, will be used to format the page_content and metadata into the final string.

Returns

string of the document formatted.

Return type

str