使用angular-meteor通过Meteor.methods在服务器和客户端之间发送数组

debugcn 发表于 Dev

尼古拉斯·萨乌西斯

我正在尝试使阵列由我的服务器管理并共享给我的客户端。我认为Meteor.methods（）将是通过创建getter方法来实现的方法。尽管由于某种原因，它可以打印到服务器正确地控制台，但是当我执行Meteor.call（）时，它会向客户端返回未定义的值。无论if是true还是false，我都会得到未定义的返回值，但始终是未定义的。

///server
Meteor.methods({
  createNewUser: this.createNewUser,
  getRoles: this.getRoles
});
...
getRoles(id) { 
  console.log(roles);
  if (Roles.userIsInRole(id, "admin")) {
    return roles;
  } else {
    return 'blah';
  }
}

///client
ngOnInit() {
 MeteorObservable.autorun().subscribe(() => {
 ...

    Meteor.call("getRoles", Meteor.userId(), (data) => {
      console.log("data", data);
      this.roles = data;
      console.log("roles", this.roles);
    });

    console.log("user list", this.userList);
    console.log("roles", this.roles);
....
});

Meteor.methods（）中的另一种方法可以完美地工作，我似乎无法弄清为什么这个方法看不到它的原因，因为它的处理量要少得多。

///output
demo.component.ts:53 user list []
demo.component.ts:54 roles []
demo.component.ts:53 user list [Object]
demo.component.ts:54 roles []
demo.component.ts:48 data undefined
demo.component.ts:50 roles undefined
demo.component.ts:48 data undefined
demo.component.ts:50 roles undefined
demo.component.ts:53 user list [Object, Object, Object, Object, Object, Object]
demo.component.ts:54 roles undefined
demo.component.ts:48 data undefined
demo.component.ts:50 roles undefined

谢谢你的帮助。

尼古拉斯·萨乌西斯

原来我的问题出在Method.call（）

它返回错误和结果，而不是单个对象。

    ///client
    Meteor.call("getRoles", Meteor.userId(), (error, data) => {
      if (!error) {
        console.log("data", data);
        this.roles = data;
        console.log("roles", this.roles);
      } else {
        console.log("error: ", error);
      }
    });

    ///output
demo.component.ts:57 user list []
demo.component.ts:58 roles []
demo.component.ts:57 user list [Object]
demo.component.ts:58 roles []
demo.component.ts:49 data ["admin","spectator","coach","player"]
demo.component.ts:51 roles ["admin","spectator","coach","player"]
demo.component.ts:49 data ["admin","spectator","coach","player"]
demo.component.ts:51 roles ["admin","spectator","coach","player"]
demo.component.ts:57 user list [Object, Object, Object, Object, Object, Object]
demo.component.ts:58 roles ["admin","spectator","coach","player"]
demo.component.ts:49 data ["admin","spectator","coach","player"]
demo.component.ts:51 roles ["admin","spectator","coach","player"]

这就是我的期望（尽管不确定为什么MeteorObservable会被触发多次）。

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