Spring Data Mongo找不到Enum的PersistentEntity [英] Spring Data Mongo cannot find PersistentEntity for Enum

问题描述

编辑：我在此处找到了一个相关问题，但仅有2个答案彼此矛盾，并且没有足够的信息来解决我的用例。

I found a related question here, but the only 2 answers contradict each other, and there was not enough information to address my use case.

我正在尝试使用Spring Data Mongo从集合中加载记录。这些记录中的字段之一是枚举，其定义如下：

I am trying to use Spring Data Mongo to load records from a collection. One of the fields within those records is an Enum, defined as such:

@AllArgsConstructor
@Getter
@JsonFormat(shape = JsonFormat.Shape.OBJECT)
public enum Action {
    APPROVED("Approved"),
    SAVED("Saved"),
    CORRECTED("Corrected");

    private String name;

    @JsonCreator
    static Action findValue(@JsonProperty("name") String name) {
        return Arrays.stream(Action.values()).filter(v -> v.name.equals(name)).findFirst().get();
    }
}

这应根据以下定义定义要序列化和反序列化的枚举JSON表示形式： { name： Saved} 。

This should define enums to be serialized and deserialized according to a JSON representation: {"name": "Saved"} for example.

Jackson似乎工作正常，因为我抛出了一个API调用，并告诉它期望 Action 类型，并且它读取枚举没有任何问题。 $ b

Jackson seems to be working fine, since I threw an API call at it and told it to expect an Action type, and it read the enum without any issues.

public void save(@RequestBody @Valid Action action) {
    System.out.println(action.getName());
} // successfully prints the name of whatever Action I give

但是，当我尝试使用Spring Data Mongo读取带有Action字段的对象，我得到以下信息：

However, when I try to read an object with an Action field using Spring Data Mongo, I get the following:

Expected to read Document Document{{name=Corrected}} into type class package.structure.for.some.proprietary.stuff.constants.Action but didn't find a PersistentEntity for the latter!

所以我在想Spring Data Mongo不能为这些枚举做任何正面或反面原因。但是我不确定如何帮助它将其注册为PersistentEntity。我的Spring Boot应用程序的主类位于软件包 package.structure.for.some.proprietary.stuff 中，并带有以下注释：

So I'm thinking Spring Data Mongo just can't make heads or tails of these enums for whatever reason. But I'm not sure how to help it register that as a PersistentEntity. The main class of my Spring Boot app is in package package.structure.for.some.proprietary.stuff and is annotated as such:

@ComponentScan("package.structure")
@EnableTransactionManagement
@EnableAutoConfiguration
@SpringBootApplication

我要读取的对象特别是由此POJO定义的：

The object in particular I'm trying to read is defined by this POJO:

import java.util.Date;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

import lombok.Data;
import lombok.NonNull;

import package.structure.for.some.proprietary.stuff.constants.Action;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
    "timeStamp",
    "action",
})
@Data
@Document(collection = "sample_coll")
public class Sample {
    @Id
    @JsonIgnore
    private String id = null;

    @JsonProperty("timeStamp")
    @NonNull
    private Date timeStamp;
    @JsonProperty("action")
    @NonNull
    private Action action;
}

，并从集合中使用MongoRepository进行查询：

and is queried from the collection with a MongoRepository:

public interface SampleRepository extends MongoRepository<Sample, String> {

}

使用 SampleRepository.findAll（ ）;

所以我的大问题是，如何让Spring Data Mongo将该枚举Action识别为PersistentEntity？

So my big question is, how do I get Spring Data Mongo to recognize this enum Action as a PersistentEntity?

推荐答案

尝试@Enumerated

Try @Enumerated

@Enumerated
@JsonProperty("action")
@NonNull
private Action action;

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