chain_schema

Returns a schema that chains the provided validation schemas, e.g.:

```py
from pydantic_core import SchemaValidator, core_schema

def fn(v: str, info: core_schema.ValidationInfo) - > str:
    assert 'hello' in v
    return v + ' world'

fn_schema = core_schema.with_info_plain_validator_function(function=fn)
schema = core_schema.chain_schema(
    [fn_schema, fn_schema, fn_schema, core_schema.str_schema()]
)
v = SchemaValidator(schema)
assert v.validate_python('hello') == 'hello world world world'
```

def chain_schema(
    steps: list[CoreSchema],
    ref: str | None = None,
    metadata: dict[str, Any] | None = None,
    serialization: SerSchema | None = None
) - > ChainSchema

Returns a schema that chains the provided validation schemas.

Parameters

Name	Type	Description
steps	list[CoreSchema]	The sequence of validation schemas to be executed in order.
ref	`str	None` = None
metadata	`dict[str, Any]	None` = None
serialization	`SerSchema	None` = None

Returns

Type	Description
ChainSchema	A schema object that executes multiple validation steps in sequence, passing the output of one step as the input to the next.