firebase - 将 firestore 文档转换为 flutter 类

Question

我有一个类(class)叫 Consultant我从用户那里为我的应用收集数据的地方。

class Consultant {
  final int id;
  final String consultantFirstName;
  final String consultantLastName;
  final String consultantNickName;
  final String consultantImageProfile;
  final String consultantCategory;
  final String consultantDescription;
  final String consultantLikes;
  final String consultantReviews;
  final String consultantStars;
  final String consultantPrice;
  final String consultantExperience;


  const Consultant({
    this.id,
    this.consultantFirstName,
    this.consultantLastName,
    this.consultantNickName,
    this.consultantImageProfile,
    this.consultantCategory,
    this.consultantDescription,
    this.consultantLikes,
    this.consultantReviews,
    this.consultantStars,
    this.consultantPrice,
    this.consultantExperience,
  });
}

以下是我的一位用户的示例:

final Consultant marco = Consultant(
    id: 1,
    consultantFirstName: 'Marco',
    consultantLastName: 'Marcello',
    consultantNickName: 'Tarot and Dreams',
    consultantCategory: 'Tarocchi',
    consultantDescription: 'Ciao a tutti sono Rocco',
    consultantImageProfile: 'assets/images/rocco.jpg',
    consultantLikes: '2342',
    consultantReviews: '76245',
    consultantPrice: '3.90',
    consultantExperience: '12',
);

List<Consultant> consultant = [
  marco,
  carmela,
  sabrina,
  saverio,
  pamela,
  giovanni
];

好的，所有这些用户信息都将通过以下方式检索到正确的小部件中: consultant.[index].consultantDescription... etc..目前所有信息都在我的类(class)中，但我需要转移到 cloud firestore，在那里我收集用户的所有信息，所以我会在我的类(class)中使用一些东西来使用 cloud firestore future 将信息动态添加到我的小部件中例子:

final Consultant user = Consultant(
    id: 1,
    consultantFirstName: data[here the documents from firestore],
    consultantLastName: data[here the documents from firestore],
    consultantNickName: data[here the documents from firestore],
    consultantCategory: data[here the documents from firestore],
    consultantDescription: data[here the documents from firestore],
    consultantImageProfile: data[here the documents from firestore],
etc...
);

这将允许我从数据库中获取信息并推送到正确的小部件
那可能吗？

Answer 1

要在本地类中转换来自 firestore 的数据，您可以在类中创建一个构造函数方法:

Consultant.fromSnapshot(Map<String, dynamic> snapshot)
      : consultantFirstName = snapshot['name'],
        consultantLastName = snapshot['last_name'],
        consultantNickName = snapshot['nickname'];

在第一列中有您的本地类字段。右侧的“name”、“last_name”等是 cloud firestore 中字段的名称。然后你打电话:

DocumentSnapshot snapshot= await db.collection('consultants').doc(/*consultant id*/).get();
if(snapshot.exists) Consultant consultant = Consultant.fromSnapshot(snapshot.data());

如果您还需要保存 ID，请执行以下操作:

Consultant.fromSnapshot(String id, Map<String, dynamic> snapshot)
      : consultantId= id,
        consultantFirstName = snapshot['name'],
        consultantLastName = snapshot['last_name'],
        consultantNickName = snapshot['nickname'];

进而:

Consultant consultant = Consultant.fromSnapshot(snapshot.id,snapshot.data());

对于构建小部件，最直接的方法是使用 FutureBuilder 在检索信息时更新您的顾问集合