如何构建这些需求？ （微服务）

Question

我有一个客户微服务（客户文件）和一个银行账户微服务（银行账户文件）。我如何构建这些要求？

有两种类型的客户：个人和企业。

• 一个个人客户最多只能有一个储蓄账户、一个支票账户或定期账户。

• 一个企业客户可能没有一个储蓄或定期账户，但可能有多个支票账户。

在客户文档中，我有一个标识银行账户的 ID 属性，可以满足第一个要求，但是，第二个表明如果是业务类型，您可以拥有多个支票账户。

---------------------

编辑：

添加了更多要求。

• 商业银行账户可能有一个或多个账户持有人和零个或多个授权签字人。

• 系统必须允许查询客户拥有的银行账户的所有动向和类型（取款或存款）。

Answer 1

db

db={
  "clients": [
    {
      "_id": 1,
      "type": "personal",
      "name": "Tom",
      "createAt": ISODate("2022-01-10T11:23:25.184Z")
    },
    {
      "_id": 2,
      "type": "business",
      "name": "Apple",
      "createAt": ISODate("2022-01-12T05:10:42.220Z")
    }
  ],
  "accounts": [
    {
      "_id": 1,
      "client_id": 1,
      "type": "saving",
      "money": 12000
    },
    {
      "_id": 2,
      "client_id": 1,
      "type": "checking",
      "money": 8000
    },
    {
      "_id": 3,
      "client_id": 2,
      "type": "checking",
      "money": 6000
    },
    {
      "_id": 4,
      "client_id": 2,
      "type": "checking",
      "money": 7000
    }
  ]
}

汇总

db.clients.aggregate([
  {
    "$lookup": {
      "from": "accounts",
      "localField": "_id",
      "foreignField": "client_id",
      "as": "account_docs"
    }
  }
])

mongoplayground

---

db

db={
  "clients": [
    {
      "_id": 1,
      "type": "personal",
      "name": "Tom",
      "createAt": ISODate("2022-01-10T11:23:25.184Z")
    },
    {
      "_id": 2,
      "type": "business",
      "name": "Apple",
      "createAt": ISODate("2022-01-12T05:10:42.220Z")
    },
    {
      "_id": 3,
      "type": "business",
      "name": "Apple2",
      "createAt": ISODate("2022-01-13T05:10:42.220Z")
    }
  ],
  "accounts": [
    {
      "_id": 1,
      "type": "saving",
      "money": 12000
    },
    {
      "_id": 2,
      "type": "checking",
      "money": 8000
    },
    {
      "_id": 3,
      "type": "checking",
      "money": 6000
    },
    {
      "_id": 4,
      "type": "checking",
      "money": 7000
    }
  ],
  "clientRoles": [
    {
      "_id": 1,
      "client_id": 1,
      "account_id": 1,
      "type": "holder"
    },
    {
      "_id": 2,
      "client_id": 2,
      "account_id": 3,
      "type": "holder"
    },
    {
      "_id": 3,
      "client_id": 3,
      "account_id": 3,
      "type": "signatory"
    }
  ],
  "clientMovements": [
    {
      "_id": 1,
      "client_id": 1,
      "account_id": 1,
      "type": "deposit",
      "money": 20000
    },
    {
      "_id": 2,
      "client_id": 1,
      "account_id": 1,
      "type": "withdraw",
      "money": 8000
    }
  ]
}

汇总

db.clients.aggregate([
  {
    "$match": {
      "_id": 1
    }
  },
  {
    "$lookup": {
      "from": "clientMovements",
      "localField": "_id",
      "foreignField": "client_id",
      "as": "movement_docs"
    }
  }
])

mongoplayground