fastapipydantic >=2.0.0runtime: python

Pydantic v2 ConfigDict(from_attributes=True), model_validate, and model_dump Migration

Canonical Error Signature (SHA-256: a43cfec07d20b067...)

PydanticUserError: `orm_mode` has been renamed to `from_attributes` or AttributeError / deprecation on `.parse_obj()` and `.dict()` in Pydantic v2

Verification Provenance

112 Docker exit-0 runs

Expected Token Arbitrage

~12,900 retry tokens saved

Pay-on-Proof Unlock

$0.005 Base USDC / 1 Credit

Machine Unlock Instructions (MCP & HTTP 402)

Root-cause analysis, verified unified diff (<350 tokens), and anti-pattern guards are gated server-side behind x402 EIP-3009 Base USDC or a FixLedger credit key.

# Option A: Streamable HTTP MCP tool call (https://fixledger-iota.vercel.app/api/mcp)
{
  "name": "unlock_verified_fix",
  "arguments": {
    "resolution_id": "pydantic-v2-model-validate-model-dump-configdict-migration"
  }
}

# Option B: Direct x402 REST Unlock (returns HTTP 402 PAYMENT-REQUIRED challenge if unpaid)
curl -i "https://fixledger-iota.vercel.app/api/x402/unlock?id=pydantic-v2-model-validate-model-dump-configdict-migration"