[PYTHON] update to pydantic v2

[oshmoun]

Description

Recently, pydantic v2 was released, with changes that deprecate/remove some configs and functions.
In order to keep the generator up-to-date, and avoid generating deprecated code, a template update is in order to produce pydantic v2 models.

openapi-generator version

latest master

OpenAPI declaration file content or url

N/A

Command line used for generation

N/A

Steps to reproduce

N/A

Related issues/PRs

#16176

Suggest a fix/enhancement

N/A

@oshmoun @wing328
Sorry for question at here
Our server is migrated to pydentic v2.3 so I get errors now when I use generator
Is there a way to resolve this situation before release this PR(#16549)?
Thank you for your hard work 👍

[oshmoun]

Our server is migrated to pydentic v2.3 so I get errors now when I use generator

What kind of errors? Afaik one should be only getting deprecation warnings 🙂

@oshmoun This is the part of error log what I get:

[[main] ./api] [main] ERROR i.s.v.p.reference.ReferenceVisitor - Error resolving schema #/components/schemas/OrderBulkResultSchema
[[main] ./api] java.lang.IllegalArgumentException: Cannot deserialize value of type `java.lang.Boolean` from Object value (token `JsonToken.START_OBJECT`)
[[main] ./api]  at [Source: UNKNOWN; byte offset: #UNKNOWN]
[[main] ./api]  at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4393)
[[main] ./api]  at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4324)
[[main] ./api]  at io.swagger.v3.core.util.ModelDeserializer.deserializeJsonSchema(ModelDeserializer.java:157)

[[main] ./api] Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `java.lang.Boolean` from Object value (token `JsonToken.START_OBJECT`)
[[main] ./api]  at [Source: UNKNOWN; byte offset: #UNKNOWN]
[[main] ./api]  at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)
[[main] ./api]  at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1741)

[oshmoun]

@oshmoun This is the part of error log what I get:

[[main] ./api] [main] ERROR i.s.v.p.reference.ReferenceVisitor - Error resolving schema #/components/schemas/OrderBulkResultSchema
[[main] ./api] java.lang.IllegalArgumentException: Cannot deserialize value of type `java.lang.Boolean` from Object value (token `JsonToken.START_OBJECT`)
[[main] ./api]  at [Source: UNKNOWN; byte offset: #UNKNOWN]
[[main] ./api]  at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4393)
[[main] ./api]  at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4324)
[[main] ./api]  at io.swagger.v3.core.util.ModelDeserializer.deserializeJsonSchema(ModelDeserializer.java:157)

[[main] ./api] Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `java.lang.Boolean` from Object value (token `JsonToken.START_OBJECT`)
[[main] ./api]  at [Source: UNKNOWN; byte offset: #UNKNOWN]
[[main] ./api]  at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)
[[main] ./api]  at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1741)

Not sure i see a relation to pydantic. Appears to be an issue with parsing openapi spec 😅

@oshmoun Thank you for your research!
Then... maybe openapi version can be cause of this error
I'll try again after downgrade version. Thank you so much :)

[wing328]

FYI. I've filed #16549 to add an option to support pydantic v2.

Still need more work as some integration tests failed

[wing328]

Agreed with @oshmoun the issue seems related to spec (input file).

You may want to try other generators (e.g. java, ruby, etc) to see if you get the same errors.

[robertschweizer]

The "python" generator switched to pydantic v2 in #16624

[timo-reymann]

@robertschweizer that does not seem to be the case.

pydantic/pydantic#7495

the code you generated doesn't utilize v2 of Pydantic

[oshmoun]

The "python" generator switched to pydantic v2 in #16624

Oh wasn't aware it was merged, thanks for the hint!

@robertschweizer that does not seem to be the case.

Are you sure your version of the generator included this change. I'm not actually sure if it's included in a release yet 😅

[timo-reymann]

Are you sure your version of the generator included this change. I'm not actually sure if it's included in a release yet 😅

I find it really hard to find any change in a release, as there is only the "look in the PRs", which is a nightmare.

But it was generated with 7.0.1

[robertschweizer]

You can see "milestone 7.1.0" in #16624. This version has not been released yet, but it's due on October 18: https://github.com/OpenAPITools/openapi-generator#11---compatibility

[wing328]

please use the SNAPSHOT version for the time being: https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/7.1.0-SNAPSHOT/