Question

我在2个Loopback模型之间有一个简单的has_many-belongsst_to关系：

{
  "name": "ApiUser",
  "base": "PersistedModel",
  "idInjection": true,
  "options": {
    "postgresql": {
      "table": "users"
    },
    "validateUpsert": true
  },
  "properties": {
    "id": {
      "type": "string",
      "id": true,
      "required": true,
      "defaultFn": "uuid",
      "postgresql": {
        "dataType": "uuid"
      }
    },
    "email": {
        ...

和

{
  "name": "ShopifyAccount",
  "base": "PersistedModel",
  "idInjection": true,
  "options": {
    "validateUpsert": true
  },
  "properties": {
    "api_key": {
      "type": "string",
      "required": true
    },
    "password": {
      "type": "string",
      "required": true
    }
  },
  "validations": [],
  "relations": {
    "orders": {
      "type": "hasMany",
      "model": "ShopifyOrder",
      "foreignKey": ""
    },
    "user": {
      "type": "belongsTo",
      "model": "ApiUser",
      "foreignKey": "userid"
    }
  },
  "acls": [],
  "methods": {}
}

当我运行自动迁移时，会创建shopifyaccount表，但它看起来很奇怪：

  Column       |  Type   |                          Modifiers                          
------------------- + --------- + ----------------- --------------------------------------------

api_key |文字|不为空

密码|文字|不为空

id |整数| not null default nextval（＆＃39; shopifyaccount_id_seq＆＃39; :: regclass）

userid | uuid |

apiuserid | uuid |

索引：

＆＃34; shopifyaccount_pkey＆＃34; PRIMARY KEY，btree（id）

为什么要创建2个这样命名的列？即使我尝试指定外键是＆＃34; userid＆＃34;，它仍然会创建apiuserid列。插入将永远不会更新apiuserid列，但它将更新userid列。然后在加入时，它将尝试加入apiuserid。我做错了什么？

Answer 1

所以...似乎需要在ApiUser和ShopifyAccount中的两个地方都指定“foreignkey”：

{
  "name": "ApiUser",
  "base": "PersistedModel",
  "idInjection": true,
  "options": {
    "postgresql": {
      "table": "users"
    },
    "validateUpsert": true
  },
  "properties": {
    "id": {
      "type": "string",
      "id": true,
      "required": true,
      "defaultFn": "uuid",
      "postgresql": {
        "dataType": "uuid"
      }
    },
    "email": {
      "type": "string",
    ...
  "relations": {
    "shopifyAccounts": {
      "type": "hasOne",
      "model": "ShopifyAccount",
      "foreignKey": "userid"
    }
  },
  "acls": [],
  "methods": {}
}

正确的方法来定义Loopback.io belongsTo relationship

1 个答案: