我和my previous question有一个几乎相同的问题。创建user模型时，将返回以下错误：
ReferenceError: g is not defined
at new ModelConstructor (eval at createModelClassCtor (/usr/src/app/node_modules/loopback-datasource-juggler/lib/model-builder.js:671:21), <anonymous>:10:27)
at user.ModelBaseClass._initProperties (/usr/src/app/node_modules/loopback-datasource-juggler/lib/model.js:349:28)
at user.ModelBaseClass (/usr/src/app/node_modules/loopback-datasource-juggler/lib/model.js:60:8)
at user.Model (eval at createModelClassCtor (/usr/src/app/node_modules/loopback-datasource-juggler/lib/model-builder.js:671:21), <anonymous>:12:24)
at user.PersistedModel (eval at createModelClassCtor (/usr/src/app/node_modules/loopback-datasource-juggler/lib/model-builder.js:671:21), <anonymous>:12:24)
at user.User (eval at createModelClassCtor (/usr/src/app/node_modules/loopback-datasource-juggler/lib/model-builder.js:671:21), <anonymous>:12:24)
at new user (eval at createModelClassCtor (/usr/src/app/node_modules/loopback-datasource-juggler/lib/model-builder.js:671:21), <anonymous>:12:24)
at Function.DataAccessObject.create (/usr/src/app/node_modules/loopback-datasource-juggler/lib/dao.js:359:13)
at /usr/src/app/node_modules/loopback-datasource-juggler/lib/dao.js:1262:13
at /usr/src/app/node_modules/loopback-datasource-juggler/lib/dao.js:2175:62
at /usr/src/app/node_modules/loopback-datasource-juggler/lib/dao.js:2111:9
at /usr/src/app/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:1012:9
at /usr/src/app/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:359:16
at eachOfArrayLike (/usr/src/app/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:928:9)
at eachOf (/usr/src/app/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:990:5)
at _asyncMap (/usr/src/app/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:1005:5)
at Object.map (/usr/src/app/node_modules/loopback-datasource-juggler/node_modules/async/dist/async.js:995:16)
at allCb (/usr/src/app/node_modules/loopback-datasource-juggler/lib/dao.js:2025:13)
at /usr/src/app/node_modules/loopback-connector-mongodb/lib/mongodb.js:1155:9
at result (/usr/src/app/node_modules/mongodb/lib/utils.js:414:17)
at executeCallback (/usr/src/app/node_modules/mongodb/lib/utils.js:406:9)
at handleCallback (/usr/src/app/node_modules/mongodb/lib/utils.js:128:55)
这是我的模特：
user.json：
{
"name": "user",
"plural": "users",
"base": "User",
"idInjection": false,
"options": {
"validateUpsert": true
},
"properties": {
"id": {
"type" : "string",
"id" : true,
"required" : true,
"defaultFn" : "guid"
},
"type": {
"type" : "[string]",
"required" : true,
"default" : ["student"]
},
"full_name": {
"type": "string",
"required": false
},
"office" : {
"type": "string",
"required" : false
},
"profile_img": {
"type": "string",
"required": false
},
"departmentId": {
"type": "string",
"required": false
}
},
"validations": [],
"relations": {
"department": {
"type": "belongsTo",
"model": "department"
},
"syncedcalendar" : {
"type" : "hasMany",
"model" : "syncedcalendar"
},
"accessTokens": {
"type": "hasMany",
"model": "accessToken",
"foreignKey": "userId",
"options": {
"disableInclude": true
}
}
},
"acls": [],
"methods": {}
}
accessToken.json
{
"name": "accessToken",
"plural": "accessTokens",
"base": "AccessToken",
"properties": {},
"validations": [],
"idInjection": false,
"relations": {
"user": {
"type": "belongsTo",
"model": "user",
"foreignKey": "userId"
}
},
"acls": [],
"methods": []
}
上面的错误（在这种情况下和我之前的问题）都是因为loopback无法解析模型的json文件。在这种情况下，它是type的user属性：
"type": {
"type" : "[string]",
"required" : true,
"default" : ["student"]
},
似乎default不能是一个阵列。删除此默认值并在挂钩中强制执行此默认值可解决此问题。
我经历了一个类似于你的问题。是的，错误堆栈提供的有用信息太少。它应该说：“请坚持Loopback类型”，因为这是问题所在。你被Loopback types困住了。
在您的情况下，解析器无法处理数组。好吧，事实证明它也不会解析未识别的类型字符串。例如，如果您尝试将属性声明为qazxsw poi：
integer它将抛出，因为本机类型是 "id":
{
"type": "Integer", <----- not a loopback type
"id": 1,
"mysql":
{
"columnName": "id",
"dataType": "int",
}
},
。你可以Number它作为整数，但不要乱用它的format。
type如果您的数据库值类似于json（因此它们应该作为数组和对象重新出现），只需将它们声明为Objects。