动态生成的多个未在模型中验证的字段

def validate_dynamic_fields(data):
    for key, value in data.items():
        if not isinstance(value, (str, int)):
            raise ValueError(f"Invalid type for field {key}")
        if key.startswith('custom_') and len(value) > 50:
            raise ValueError(f"Field {key} exceeds maximum length")

class FieldStrategy:
    def validate(self, value):
        raise NotImplementedError

class StringFieldStrategy(FieldStrategy):
    def validate(self, value):
        if not isinstance(value, str):
            raise ValueError("Expected a string")
        return True

strategies = {
    'name': StringFieldStrategy(),
    # ... 其他字段策略
}

def validate_field(field_name, value):
    strategy = strategies.get(field_name)
    if strategy:
        return strategy.validate(value)
    else:
        raise KeyError(f"No validation strategy for field {field_name}")

from functools import lru_cache

@lru_cache(maxsize=128)
def get_dynamic_field(field_name):
    # ... 获取字段值的逻辑
    pass