尝试使用反应数据时，我得到了 bean 类 [reactor.core.publisher.MonoOnAssembly] 的无效属性“id”

Question

我正在尝试将 thymeleaf 形式与单值反应数据流一起使用。使用 spring boot 2.1.3、thymeleaf 3.0.11 和 webflux。我的 POJO 是：

@Getter
@Setter
@NoArgsConstructor
public class RecipeCommand {
    private String id;
    private String description;
}

控制器是：

@GetMapping("/recipe/{id}/update")
public String updateRecipe(Model model, @PathVariable String id){

    Mono<RecipeCommand> recipeCommandMono = recipeService.getRecipeCommandById(id);
    model.addAttribute("recipe", recipeCommandMono);
    return "recipes/recipeform";
}

其中 recipes/recipeform 是百里香叶形式以更新配方：

<form  th:object="${recipe}" th:action="@{/post}" method="post">
    <input type="hidden" th:field="*{id}"/>

应用程序运行但在尝试更新配方时出现以下错误：

引起：org.springframework.beans.NotReadablePropertyException: Invalid property 'id' of bean class [reactor.core.publisher.MonoOnAssembly]: Bean 属性 'id' 不可读或具有无效的 getter 方法： getter 匹配 setter 的参数类型？

任何想法如何使用百里香叶形式与反应流。

聚甲醛：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0   http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gabriel</groupId>
    <artifactId>spring-recipe</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-recipe</name>

    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>4.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>popper.js</artifactId>
            <version>1.14.7</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-failsafe-plugin</artifactId>
                <version>3.0.0-M3</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>integration-test</goal>
                            <goal>verify</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

Answer 1

您正在尝试将Mono传递给您的模板。相反，您可以使用IReactiveDataDriverContextVariable对象包装Mono。IReactiveDataDriverContextVariable 与Flux一起使用，因此您应该使用Flux()方法将Mono转换为Flux。

@GetMapping("/recipe/{id}/update")
public String updateRecipe(Model model, @PathVariable String id){

    Mono<RecipeCommand> recipeCommandMono = recipeService.getRecipeCommandById(id);
    IReactiveDataDriverContextVariable recipe = new ReactiveDataDriverContextVariable(recipeCommandMono.flux(), 1);
    model.addAttribute("recipes", recipe);
    return "recipes/recipeform";
}

更改百里香部分（变量食谱现在是异步列表）

<div th:each="recipe : ${recipes}">
    <form  th:object="${recipe}" th:action="@{/post}" method="post">
        <input type="hidden" th:field="*{id}"/>