feat: sync get_text_content from dify-api

[Stream29]

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[gemini-code-assist]

Summary of Changes

Hello @Stream29, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new utility method, get_text_content, to the PromptMessage class. This enhancement aims to standardize the extraction of textual information from messages, accommodating various content structures, including simple strings and complex multi-modal lists. This ensures consistent text retrieval across the application, simplifying content processing.

Highlights

• New get_text_content method: A new method, get_text_content, has been added to the PromptMessage class. This method is designed to extract text content from messages, supporting both simple string content and multi-modal content lists, ensuring only the textual parts are returned.

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[gemini-code-assist]

Code Review

This pull request introduces a get_text_content method to the PromptMessage class, which is a useful addition for extracting textual content from messages that might be multi-modal. The implementation is functionally correct, but I have a couple of suggestions. I've recommended a small refactor to make the code more concise and idiomatic, and also pointed out the need for unit tests to ensure the new functionality is robust.

[gemini-code-assist]

This new method is a helpful addition. To ensure it functions correctly under all conditions and to prevent future regressions, it would be beneficial to add unit tests. The tests should cover various scenarios, such as when content is a simple string, a list with mixed content types (including lists with no text content), an empty list, and None.

[gemini-code-assist]

For improved readability and conciseness, you can use a generator expression directly within "".join(). This is a more Pythonic approach and can be more memory-efficient for large lists as it avoids creating an intermediate list in memory.

Suggested change

	text_parts = []
	for item in self.content:
	if isinstance(item, TextPromptMessageContent):
	text_parts.append(item.data)
	return "".join(text_parts)
	return "".join(item.data for item in self.content if isinstance(item, TextPromptMessageContent))