英文:
Saving Jsonified Java Objects in Firestore
问题
这里有没有一种方法来处理将一个POJO类，将其写入JSON字符串并保存到Firestore的过程？
我知道可以将POJO类保存到Firestore，然而，我的许多类都有诸如JsonIgnore，JsonProperty等注释。
例如，我可以有以下类：
@Data
public class Player {
@JsonIgnore
private String id;
@JsonProperty("playersName")
private String name;
@JsonProperty("playersAge")
private String age;
}
如果我直接将这个POJO保存到Firestore，我会得到以下结果：
id: "12345"
name: "John Doe"
age: "30"
如果我将其转换为JSON字符串，它会看起来类似于这样，我想将其保存到Firestore中：
{
"playersName": "John Doe"
"playersAge": "30"
}
在Firestore中，我想将其保存为上述JSON字符串：
playersName: "John Doe"
playersAge: "30"
然而，Firestore不允许保存原始类型/数组，那么实现上述目标的最佳方法是什么？
英文:
Is there a way to go about taking a POJO class, writing it into a JSON string and saving it to Firestore?
I know it is possible to save POJO classes to Firestore, however, a lot of my classes have annotations such as JsonIgnore, JsonProperty etc.
For example I could have the following class
@Data
public class Player {
@JsonIgnore
private String id;
@JsonProperty("playersName")
private String name;
@JsonPropety("playersAge")
private String age;
}
If I save this POJO directly into Firestore, I will get the following
id: "12345"
name: "John Doe"
age: "30"
If I convert it to JSON string it will look along something like this, which I would like to save into Firestore
{
"playersName": "John Doe"
"playersAge": "30"
}
In Firestore I would like to save it as the above JSON string
playersName: "John Doe"
playersAge: "30"
However, Firestore doesn't allow to save primitives/arrays, so what would be the best approach to wanting to accomplish the above?
答案1
得分: 2
Firestore有自己的注解，用于忽略POJO成员或更改其名称。查看@Exclude，作为@JsonIgnore的等效注解。还可以查看注解@PropertyName、@IgnoreExtraProperties和@ThrowOnExtraProperties。
（请注意，我链接到了Android API的注解。如果您使用的是Java服务器SDK，它们将存在于不同的包中，例如@Exclude。）
如果您不使用这些注解，您将需要手动将要保存到文档中的字段复制到Map<String, Object>，并将其提供给set()或update()。在读取文档时类似，会提供一个Map供您复制字段。
英文:
Firestore has its own annotations for ignoring POJO members or changing their names. Look into @Exclude as an equivalent to @JsonIgnore. Also see annotations @PropertyName, @IgnoreExtraProperties, and @ThrowOnExtraProperties.
(Note that I linked to the Android API annotations. If you're using the Java server SDK, they will exist in a different package, e.g. @Exclude.)
If you don't use these annotations, you will instead have to manually copy the fields you want to save into the document using a Map<String, Object> and provide that to set() or update(). Similar when reading the documents - you will be provided with a Map to copy fields out of.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论