Question

我在Firestore中创建了一个Collection“Person”。我可以从代码中创建文档和字段。

ngOnInit() {
this.personCol = this.afs.collection('person');
//snapshotChanges is used to retreive the document data and other metadata, which includes the ID
//we need ID to edit or delete a record
this.person = this.personCol.snapshotChanges()
  .map(actions => {
   return actions.map(a => {
     const data = a.payload.doc.data() as Person;
     const id = a.payload.doc.id;
     return { id, data };
   });
  });}
addPerson() {
this.afs.collection('person').add({
  'name': this.name,
  'age': this.age,
});}
getPerson(PersonId) {
this.personDoc = this.afs.doc('person/'+personId);
this.singlePerson = this.personDoc.valueChanges();

}

现在我想添加一个人借书的清单：

Person: 
{Name: "John"
 Age: 32 
 Books: {Title: "First book", Author: "Some author"
         Title: "Second book" Author: "Another author"},
{Name: "Anne"
 Age: 21
 Books: {Title: "How to... book", Author: "Author Name"
         Title: "Flowers book" Author: "Another author"}

如何使用Angular创建Books子集合？如何访问Books子集以更新代码中的title和author？

Answer 1

要访问特定人员的书籍子集：

this.personBooks = this.afs.collection('person/'+personId+'/Books');

Answer 2

好的，感谢Frank van Puffelen，我找到了一个添加子集的解决方案。首先，我要创建一个人并显示所有人的列表。

addPerson() {
 this.afs.collection('person').add({
  'name': this.name,
  'age': this.age
  });
}

当我点击列表中的一个人时，我会获得personId，然后我会在books子集合中添加图书：

addBook(personId) {
 this.afs.collection('person/' + personId + '/books').add({
  'book': this.book
 });
}

如果在此之前创建了books，则会将该书添加到该集合中，如果不是，则首先创建books子集并添加第一本书。

如何使用Angular Firestore创建和更新子集合？

2 个答案: