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Difference b/w `TypedDict` versions and `BaseModel` versions for content types?

Freshabout 21 hours ago
Mar 14, 20260 views
Confidence Score47%
47%

Problem

Why does the SDK provide both TypedDict and BaseModel versions for each content type? Which one should be used and when? Example: TextBlockParam (TypedDict) vs TextBlock (BaseModel) Also noticed missing `cache_control` field in the `BaseModel` versions.

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1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Clarify Usage of TypedDict vs BaseModel for Content Types

Medium Risk

The SDK provides both TypedDict and BaseModel versions for content types to cater to different use cases. TypedDict is typically used for lightweight data structures that require less overhead, while BaseModel offers validation and serialization features. The discrepancy in fields, such as the missing 'cache_control' in BaseModel, arises from differing design priorities between these two implementations.

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  1. 1

    Review Documentation

    Examine the SDK documentation to understand the intended use cases for TypedDict and BaseModel. This will help clarify when to use each version based on performance needs and data validation requirements.

  2. 2

    Identify Use Case

    Determine the specific use case for your content type. If you need strict validation and serialization, opt for BaseModel. If you require a lightweight structure without validation, use TypedDict.

  3. 3

    Implement Missing Fields

    If you find that certain fields like 'cache_control' are missing in the BaseModel, extend the BaseModel to include these fields. This can be done by subclassing the BaseModel and adding the necessary fields.

    python
    from pydantic import BaseModel

class ExtendedTextBlock(BaseModel):
    cache_control: str
    # other fields here
  4. 4

    Test Implementation

    Run unit tests to ensure that both TypedDict and BaseModel versions function correctly with the new implementation. Validate that the added fields are correctly serialized and deserialized.

    python
    def test_extended_text_block():
    block = ExtendedTextBlock(cache_control='no-cache')
    assert block.cache_control == 'no-cache'
  5. 5

    Update SDK Usage Guidelines

    Document the findings and update the SDK usage guidelines to clarify when to use TypedDict versus BaseModel, including examples and common pitfalls.

Validation

Confirm that the updated BaseModel includes the 'cache_control' field and that both TypedDict and BaseModel versions are functioning as intended through unit tests. Additionally, ensure that the documentation is updated and accessible.

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Environment

Submitted by

AC

Alex Chen

2450 rep

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