使用Angularfire2按键排除项目-ExcludeitemsbykeywithAngularfire2

I have a Firebase database with this JSON:

我有一个JSON为基础的数据库:

"help_text": [{
            "Name": "Blue Dye",
            "Max Stack": 5,
            "Potion Quantity": 1,
            "Price": 10,
            "Stackable": true
        },
        {
            "Name": "Blue Gem",
            "Max Stack": 20,
            "Price": 200,
            "Quest Item": true,
            "Stackable": true
        },
        {
            "Name": "Blue Gem Fragment",
            "Max Stack": 20,
            "Price": 50,
            "Quest Item": true,
            "Stackable": true
        },
        {
            "Name": "Blue Flower",
            "Max Stack": 20,
            "Mesh Y": -0,
            "Model": "blue_flower",
            "Price": 5,
            "Stackable": true
        }
    ...etc etc...

I am using Angular 4 to output the Name fields as headers and the individual items as list items:

我使用角4输出名称字段作为标题，单个项目作为列表项:

app.help-screen component.html

app.help-screen component.html

  
{{item.Name}}
  

    
Potion Quantity: {{ item["Potion Quantity"] }}
    
Price: {{ item.Price }}
    
Stackable: {{ item.Stackable }}
    
Quest Item: {{ item["Quest Item"] }}
    
Max Stack: {{ item["Max Stack"] }}
  

app-help-screen.component.ts

app-help-screen.component.ts

import { Component, OnInit } from '@angular/core';
import { AngularFireDatabase, FirebaseListObservable } from 'angularfire2/database';

@Component({
  selector: 'app-help-screen',
  templateUrl: './app-help-screen.component.html',
  styleUrls: ['./app-help-screen.component.css']
})
export class HelpScreenComponent implements OnInit {
  items: FirebaseListObservable;

  constructor(db: AngularFireDatabase) {
    this.items = db.list('help_text');
    console.log(this.items);
  }

  ngOnInit() {
  }

}

This works but it's not very elegant and means the database code will have to be rewritten every time an object with a new property is added. What I would ideally like to do is output all fields as a list item, excluding the name, the model name and the mesh placement value. Looking at the Angularfire2 docs:

这是可行的，但并不十分优雅，这意味着每次添加新属性的对象时都必须重写数据库代码。我理想的做法是输出所有字段作为列表项，不包括名称、模型名称和网格放置值。看看Angularfire2文档:

https://github.com/angular/angularfire2/blob/master/docs/4-querying-lists.md

https://github.com/angular/angularfire2/blob/master/docs/4-querying-lists.md

there doesn't seem to be a way to exclude items from a query by key. Surely there must be a way to perform such a basic query using Firebase and Angularfire2?

似乎没有一种方法可以通过键将项从查询中排除。肯定有办法使用Firebase和Angularfire2执行这样的基本查询吗?

1 个解决方案