When using min_length on Sequence field, outputted JSON schema is minLength instead of minItems for array type

[skylander86]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

class Example(BaseModel):
  array: Sequence[int] = Field(default_factory=list, min_length=1)

Example.model_json_schema()

The above returns a JSON schema

{'properties': {'array': {'items': {'type': 'integer'}, 'minLength': 1, 'title': 'Array', 'type': 'array'}}, 'title': 'Example', 'type': 'object'}

which uses minLength rather than minItems which is incorrect.

However, when we use array: list[int], the JSON schema correctly uses minItems.

Example Code

from pydantic import BaseModel
from typing import Sequence

class Example(BaseModel):
  array: Sequence[int] = Field(default_factory=list, min_length=1)

Example.model_json_schema()

Python, Pydantic & OS Version

pydantic version: 2.7.0
        pydantic-core version: 2.18.1
          pydantic-core build: profile=release pgo=true
                 install path: /Users/yc/Library/Caches/pypoetry/virtualenvs/hippocrates-mp3Iifoy-py3.12/lib/python3.12/site-packages/pydantic
               python version: 3.12.2 (main, Feb  6 2024, 20:19:44) [Clang 15.0.0 (clang-1500.1.0.2.5)]
                     platform: macOS-14.4-arm64-arm-64bit
             related packages: typing_extensions-4.11.0 mypy-1.4.1
                       commit: unknown

[sydney-runkle]

@skylander86,

Thanks for reporting this! We can fix in a 2.7 patch release soon. Adding to the corresponding milestone!

[sydney-runkle]

Ok I don't think this is actually a 2.7 issue (can reproduce in 2.6.4).

[sydney-runkle]

Removing this from the 2.7 milestone, great first issue if someone wants to pick this up!

[anesmemisevic]

Hi, I can take this.