Question

我已经记忆了一个对象，并考虑向该变量添加缓存。.如果速度很重要，这是必需的吗？

<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>2.1.1.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>gs-vault-config</artifactId>
    <version>1.0</version>
    <name>gs-vault-config</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.RC2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-vault-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>
</project>

添加缓存

def user_details    
 @_user_details ||= user.profiles.includes(":asso_1,:asso_2,:asso_3")
end

Answer 1

更改您的缓存密钥；使其类似于：users_#{user.id};

然后，您需要在用户更新时删除此密钥。

此外，您的user_details方法应类似于：

def user_details    
  @_user_details ||= Rails.cache.fetch("users_#{user.id}") do
    user.profiles.includes(":asso_1,:asso_2,:asso_3")
  end

  return @_user_details
end

（我不确定您为什么要在@_user_details中使用它，但我还是像您的示例一样保留它）

您的用户模型应如下所示：

class User < ApplicationRecord
  ...

  after_update { Rails.cache.delete(cache_key) }

  def cache_key
    "users_#{self.id}"
  end

  def details
    Rails.cache.fetch(cache_key) do
      self.profiles.includes(":asso_1,:asso_2,:asso_3")
    end
  end
end

向缓存对象添加缓存

1 个答案: