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An incomplete attempt at trying to allow pydantic.v1 models in FastAPI. My overall conclusion is this is probably a waste of time and too risky, likely adds more risk and takes more time than modifying all models to work with Pydantic v2. There are too many edge cases with FastAPI usage of the global fastapi._compat.PYDANTIC_V2 variable which gets resolved at import time.

Versions

FastAPI 0.115.5 and Pydantic 2.10.2

Usage

Invoke patch_v2_compat() before you do anything with the FastAPI application (like adding routes):

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Supporting code for some exploration on DataDog/dd-trace-py#3819.

Attempted in the context of a Django app. The settings.py file corresponds to the main Django settings.py, but code should be able to be extracted out to other library entrypoints.

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/basedir/documents/ @myorg/squad1
/basedir/documents/otherplace @myorg/squad1
/basedir/ui/ @myorg/squad3
/basedir/preferences/ @myorg/squad2

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package org.broadleafoverrides.config;

import com.broadleafcommerce.solr.autoconfigure.SolrProperties;
import com.broadleafcommerce.solr.autoconfigure.SolrServer;
import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.Executor;
import org.apache.commons.exec.PumpStreamHandler;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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[MASTER]

# A comma-separated list of package or module names from where C extensions may
# be loaded. Extensions are loading into the active Python interpreter and may
# run arbitrary code
extension-pkg-whitelist=

# Add files or directories to the blacklist. They should be base names, not
# paths.
ignore=CVS

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server:
  port: 8443
  ssl:
    key-password: keypass
    key-store: classpath:local.keystore
    key-store-password: storepass

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package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.Input;
import org.springframework.cloud.stream.annotation.Output;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.SubscribableChannel;

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[WARNING] The requested profile "SNAPSHOTS" could not be activated because it does not exist.
[ERROR] Failed to execute goal com.diffplug.spotless:spotless-maven-plugin:1.21.1:check (check) on project broadleaf-auth-services-samples-main: Execution check of goal com.diffplug.spotless:spotless-maven-plugin:1.21.1:check failed: Unable to load the mojo 'check' (or one of its required components) from the plugin 'com.diffplug.spotless:spotless-maven-plugin:1.21.1': com.google.inject.ProvisionException: Unable to provision, see the following errors:
[ERROR] 
[ERROR] 1) Error injecting: private org.eclipse.aether.spi.log.Logger org.apache.maven.repository.internal.DefaultVersionRangeResolver.logger
[ERROR] while locating org.apache.maven.repository.internal.DefaultVersionRangeResolver
[ERROR] while locating java.lang.Object annotated with *
[ERROR] at org.eclipse.sisu.wire.LocatorWiring
[ERROR] while locating org.eclipse.aether.impl.VersionRangeResolver
[ERROR] for parameter 2 at org.eclipse.aether.internal.impl.De

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# Your init script
#
# Atom will evaluate this file each time a new window is opened. It is run
# after packages are loaded/activated and after the previous editor state
# has been restored.
#
# An example hack to log to the console when each text editor is saved.
#
# atom.workspace.observeTextEditors (editor) ->
#   editor.onDidSave ->

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# Used as a base image that other Spring Boot-based
# docker containers can be based off of. Example dependent Dockerfile:
#
#     FROM <this-image>
#     ADD target/myjar.jar /app.jar
#
# Alternatively, you can modify this file to use a build arg:
#     ...
#     ...
#     ARG JAR_FILE