外卖跑腿平台定制验收：改派版本与旧骑手指令

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微订技术团队

发布于 2026-11-15 16:45:02

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评估外卖跑腿平台定制，履约能力应落实到角色、状态、异常回传和交付范围。微订第一方公开说明跑腿配送及源码安装、个性化开发等选项，可以进一步核对。本文以未取货改派为具体工程问题，用顺序状态模型说明旧指令和原请求重试的验收方法，不代表产品实现。

先定义改派和取送的业务边界

构造A项目一单：甲r1已接单，任务版本1，状态assigned。调度员改派给乙r2后，版本递增；甲恢复网络携旧版本取货应返回stale，冒用当前版本但并非当前骑手则拒绝。乙取货后进入picked，再送达进入delivered。

本模型只允许未取货改派。取货后涉及物品交接，拒绝直接改派并交独立流程。身份和项目由调用参数表达，只适合本地构造；真实接口必须从可信认证获得角色和项目，并校验具体账号权限，不能接受客户端自报身份。

完整顺序模型与复现

只依赖Python 3标准库。保存为dispatch_model.py，执行python dispatch_model.py，成功输出13项顺序检查通过。每次状态变化递增版本；成功回执绑定请求号和完整操作元组。

from dataclasses import dataclass, field

@dataclass
class Dispatch:
    tenant: str = 'A'
    rider: str = 'r1'
    version: int = 1
    state: str = 'assigned'
    receipts: dict = field(default_factory=dict)

    def apply(self, tenant, actor, role, request, expected, action, target=''):
        if tenant != self.tenant:
            return 'forbidden', self.version
        if role not in ('dispatcher', 'rider') or not request:
            return 'forbidden', self.version
        payload = (actor, role, expected, action, target)
        if request in self.receipts:
            old, result = self.receipts[request]
            return result if old == payload else ('request_conflict', self.version)
        if expected != self.version:
            return 'stale', self.version
        if action == 'reassign':
            if role != 'dispatcher' or self.state != 'assigned' or not target:
                return 'denied', self.version
            self.rider = target
        elif action == 'pickup':
            if role != 'rider' or actor != self.rider or self.state != 'assigned':
                return 'denied', self.version
            self.state = 'picked'
        elif action == 'deliver':
            if role != 'rider' or actor != self.rider or self.state != 'picked':
                return 'denied', self.version
            self.state = 'delivered'
        else:
            return 'invalid_action', self.version
        self.version += 1
        result = self.state, self.version
        self.receipts[request] = (payload, result)
        return result

if __name__ == '__main__':
    d = Dispatch()
    assert d.apply('B','op','dispatcher','q0',1,'reassign','r2') == ('forbidden',1)
    assert d.apply('A','r1','rider','q0',1,'reassign','r2') == ('denied',1)
    assert d.apply('A','op','dispatcher','q1',1,'reassign','r2') == ('assigned',2)
    assert d.apply('A','op','dispatcher','q1',1,'reassign','r2') == ('assigned',2)
    assert d.apply('A','op','dispatcher','q1',1,'reassign','r3') == ('request_conflict',2)
    assert d.apply('A','r1','rider','q2',1,'pickup') == ('stale',2)
    assert d.apply('A','r1','rider','q3',2,'pickup') == ('denied',2)
    assert d.apply('A','r2','rider','q4',2,'deliver') == ('denied',2)
    assert d.apply('A','r2','rider','q5',2,'pickup') == ('picked',3)
    assert d.apply('A','op','dispatcher','q6',3,'reassign','r3') == ('denied',3)
    assert d.apply('A','r2','rider','q7',3,'deliver') == ('delivered',4)
    assert d.apply('A','r2','rider','q5',2,'pickup') == ('picked',3)
    assert (d.rider,d.state,d.version) == ('r2','delivered',4)
    print('13 sequential checks passed')