错误：循环依赖：带有环回护照示例的“用户”

Question

我正在尝试使用 Strongloop loopback 和 loopback-component-passport 但不能完全弄清楚如何让内置用户模型和 loopback-component-passport 提供的模型之间的关系工作

看起来这些关系是在 loopback-component-passport/lib/models/*.json 文件中提供的，但我收到以下错误：

Error: Cyclic dependency: "User"
  at visit (/work/node/loopback/myapp/node_modules/loopback-boot/node_modules/toposort/index.js:29:13)
  at visit (/work/node/loopback/myapp/node_modules/loopback-boot/node_modules/toposort/index.js:43:9)
  at toposort (/work/node/loopback/myapp/node_modules/loopback-boot/node_modules/toposort/index.js:22:22)
  at module.exports.exports (/work/node/loopback/myapp/node_modules/loopback-boot/node_modules/toposort/index.js:10:10)
  at sortByInheritance (/work/node/loopback/myapp/node_modules/loopback-boot/lib/compiler.js:248:21)
  at buildAllModelInstructions (/work/node/loopback/myapp/node_modules/loopback-boot/lib/compiler.js:205:10)
  at compile (/work/node/loopback/myapp/node_modules/loopback-boot/lib/compiler.js:79:27)
  at bootLoopBackApp (/work/node/loopback/myapp/node_modules/loopback-boot/index.js:128:22)
  at Object.<anonymous> (/work/node/loopback/myapp/server/server.js:44:1)
  at Module._compile (module.js:456:26)
[stu:/work/node/loopback/myapp (master)]$ 

这是我的 model-config.json

{
  "_meta": {
    "sources": [
      "loopback/common/models",
      "loopback/server/models",
      "../common/models",
      "./models",
      "../node_modules/loopback-component-passport/lib/models"
    ]
  },
  "User": {
    "dataSource": "db",
    "public": true
  },
  "UserCredential": {
    "dataSource": "db",
    "public": true
  },
  "UserIdentity": {
    "dataSource": "db",
    "public": true
  },
  "AccessToken": {
    "dataSource": "db",
    "public": false
  },
  "ACL": {
    "dataSource": "db",
    "public": false
  },
  "RoleMapping": {
    "dataSource": "db",
    "public": false
  },
  "Role": {
    "dataSource": "db",
    "public": false
  },
  "KnowBit": {
    "dataSource": "localpg",
    "public": true
  }
}

通过使用 loopback:boot:compiler 启用调试

$ DEBUG=loopback:boot:compiler slc run

我能够得到这些日志：

[stu:/work/node/loopback/myapp (master)]$ DEBUG=loopback:boot:compiler slc run
INFO strong-agent API key not found, StrongOps dashboard reporting disabled.
Generate configuration with:
    npm install -g strongloop
    slc strongops
See http://docs.strongloop.com/strong-agent for more information.
supervisor running without clustering (unsupervised)
  loopback:boot:compiler Found model "AccessToken" - ../node_modules/loopback/common/models/access-token.json ../node_modules/loopback/common/models/access-token.js +0ms
  loopback:boot:compiler Found model "ACL" - ../node_modules/loopback/common/models/acl.json ../node_modules/loopback/common/models/acl.js +1ms
  loopback:boot:compiler Found model "Application" - ../node_modules/loopback/common/models/application.json ../node_modules/loopback/common/models/application.js +0ms
  loopback:boot:compiler Found model "Change" - ../node_modules/loopback/common/models/change.json ../node_modules/loopback/common/models/change.js +1ms
  loopback:boot:compiler Found model "Checkpoint" - ../node_modules/loopback/common/models/checkpoint.json ../node_modules/loopback/common/models/checkpoint.js +0ms
  loopback:boot:compiler Found model "Email" - ../node_modules/loopback/common/models/email.json ../node_modules/loopback/common/models/email.js +0ms
  loopback:boot:compiler Found model "RoleMapping" - ../node_modules/loopback/common/models/role-mapping.json ../node_modules/loopback/common/models/role-mapping.js +0ms
  loopback:boot:compiler Found model "Role" - ../node_modules/loopback/common/models/role.json ../node_modules/loopback/common/models/role.js +1ms
  loopback:boot:compiler Found model "Scope" - ../node_modules/loopback/common/models/scope.json ../node_modules/loopback/common/models/scope.js +0ms
  loopback:boot:compiler Found model "User" - ../node_modules/loopback/common/models/user.json ../node_modules/loopback/common/models/user.js +0ms
  loopback:boot:compiler Skipping unknown module source dir "loopback/server/models" +0ms
  loopback:boot:compiler Found model "KnowBit" - ../common/models/know-bit.json ../common/models/know-bit.js +1ms
  loopback:boot:compiler Model source code not found: undefined - TypeError: Arguments to path.join must be strings +0ms
  loopback:boot:compiler Found model "User" - ../common/models/user.json (no source file) +0ms
  loopback:boot:compiler Skipping unknown module source dir "./models" +0ms
  loopback:boot:compiler Found model "ApplicationCredential" - ../node_modules/loopback-component-passport/lib/models/application-credential.json ../node_modules/loopback-component-passport/lib/models/application-credential.js +1ms
  loopback:boot:compiler Found model "UserCredential" - ../node_modules/loopback-component-passport/lib/models/user-credential.json ../node_modules/loopback-component-passport/lib/models/user-credential.js +0ms
  loopback:boot:compiler Found model "UserIdentity" - ../node_modules/loopback-component-passport/lib/models/user-identity.json ../node_modules/loopback-component-passport/lib/models/user-identity.js +0ms
  loopback:boot:compiler Using model "User"
Configuration: {"dataSource":"db","public":true}
Definition {"name":"User","plural":"users","base":"User","relations":{"accessTokens":{"type":"hasMany","model":"AccessToken","foreignKey":"userId"},"identities":{"type":"hasMany","model":"UserIdentity","foreignKey":"userId"},"credentials":{"type":"hasMany","model":"UserCredential","foreignKey":"userId"}},"validations":[],"acls":[],"methods":[]} +0ms
  loopback:boot:compiler Using model "UserCredential"
Configuration: {"dataSource":"db","public":true}
Definition {"name":"UserCredential","base":"PersistedModel","properties":{"provider":{"type":"String","comments":"facebook, google, twitter, linkedin"},"authScheme":{"type":"String","comments":"oAuth, oAuth 2.0, OpenID, OpenID Connect"},"externalId":{"type":"String","comments":"The provider specific id"},"profile":{"type":"Object"},"credentials":{"type":"Object"},"created":"Date","modified":"Date","id":{"id":1,"generated":true}},"acls":[{"principalType":"ROLE","principalId":"$everyone","permission":"DENY"},{"principalType":"ROLE","principalId":"$owner","permission":"ALLOW"}],"relations":{"user":{"type":"belongsTo","model":"User","foreignKey":"userId"}}} +1ms
  loopback:boot:compiler Using model "UserIdentity"
Configuration: {"dataSource":"db","public":true}
Definition {"name":"UserIdentity","plural":"UserIdentities","base":"PersistedModel","properties":{"provider":{"type":"String","comments":"facebook, google, twitter, linkedin"},"authScheme":{"type":"String","comments":"oAuth, oAuth 2.0, OpenID, OpenID Connect"},"externalId":{"type":"String","comments":"The provider specific id"},"profile":{"type":"Object"},"credentials":{"type":"Object"},"created":"Date","modified":"Date","id":{"id":1,"generated":true}},"acls":[{"principalType":"ROLE","principalId":"$everyone","permission":"DENY"},{"principalType":"ROLE","principalId":"$owner","permission":"ALLOW"}],"relations":{"user":{"type":"belongsTo","model":"User","foreignKey":"userId"}}} +0ms
  loopback:boot:compiler Using model "AccessToken"
Configuration: {"dataSource":"db","public":false}
Definition {"name":"AccessToken","properties":{"id":{"type":"string","id":true},"ttl":{"type":"number","ttl":true,"default":1209600,"description":"time to live in seconds (2 weeks by default)"},"created":{"type":"Date"}},"relations":{"user":{"type":"belongsTo","model":"User","foreignKey":"userId"}},"acls":[{"principalType":"ROLE","principalId":"$everyone","permission":"DENY"},{"principalType":"ROLE","principalId":"$everyone","property":"create","permission":"ALLOW"}]} +0ms
  loopback:boot:compiler Using model "ACL"
Configuration: {"dataSource":"db","public":false}
Definition {"name":"ACL","properties":{"model":{"type":"string","description":"The name of the model"},"property":{"type":"string","description":"The name of the property, method, scope, or relation"},"accessType":"string","permission":"string","principalType":"string","principalId":"string","id":{"id":1,"generated":true}}} +0ms
  loopback:boot:compiler Using model "RoleMapping"
Configuration: {"dataSource":"db","public":false}
Definition {"name":"RoleMapping","description":"Map principals to roles","properties":{"id":{"type":"string","id":true,"generated":true},"principalType":{"type":"string","description":"The principal type, such as user, application, or role"},"principalId":"string"},"relations":{"role":{"type":"belongsTo","model":"Role","foreignKey":"roleId"}}} +0ms
  loopback:boot:compiler Using model "Role"
Configuration: {"dataSource":"db","public":false}
Definition {"name":"Role","properties":{"id":{"type":"string","id":true,"generated":true},"name":{"type":"string","required":true},"description":"string","created":"date","modified":"date"},"relations":{"principals":{"type":"hasMany","model":"RoleMapping","foreignKey":"roleId"}}} +0ms
  loopback:boot:compiler Using model "KnowBit"
Configuration: {"dataSource":"localpg","public":true}
Definition {"name":"KnowBit","base":"PersistedModel","idInjection":true,"properties":{"label":{"type":"string","required":true},"link":{"type":"string","required":true}},"validations":[],"relations":{},"acls":[],"methods":[]} +0ms

Answer 1

TL;DR

我为名称和基本属性指定了相同的字符串“用户”，为了解决问题，我将名称值更改为小写“用户”

全文

好的，所以当我复制了

loopback-example-passport/common/models/user.json

我输入错误的文件并将名称设置为“用户”而不是“用户”

这并没有解决最终的问题，但我认为它解释了循环依赖。 “base”是该模型的“base”类，我也将其设置为“User”

这使我能够通过模型编译阶段，但仍然没有配置护照代码所需的从“用户”到“用户身份”的关系。

我认为我在正确的轨道上，但洞察力是 strongloop/loopback-example-passport 示例中的环回模型正在用新模型类覆盖内置类，其中类名的第一个字母是小写例如 userCredential 是内置模型类 UserCredential 的覆盖等等，这起初有点令人困惑

{
  "name": "userCredential",
  "plural": "userCredentials",
  "base": "UserCredential",
...

但我认为，如果我检查一下我使用的是小写版本，事情可能会解决

确实是这个问题