如何将东西注入表单 [英] How to inject something into a form

问题描述

从 play 2.4.0 开始，我们可以使用 DI 框架了.

Since play 2.4.0, we can use a DI framework.

我正在尝试在我的应用中使用 DI.我将 jpa 查找器从模型类上的静态方法转移到服务层中的方法，然后注入到我的控制器中.

I am trying to use DI in my app. I moved my jpa finders from static methods on my models classes to methods in a service layer that I inject into my controllers.

我的主要问题是我有一些带有验证方法的表单，在我的验证方法中我使用了一些查找器.

My main problem is that I have some forms with a validate method and in my validate methode I use some finders.

例如在登录表单中，我使用User.authenticate"方法.现在我已经将这个静态方法替换为我的 UserSvc 上的一个新方法，我想将我的服务注入到我的表单中，但它不起作用.

For exemple in a login form I use a "User.authenticate" method. Now that I have replaced this static method to a new one on my UserSvc, I want to inject my service into my Form but it does not work.

似乎无法向 Form 中注入一些东西，那么我该如何解决我的问题

It seems that it is not possible to inject something into a Form so how can I solve my problem

public class MyController {
    // Inject here can be used in controller methods but not in the form validate method
    @Inject UserSvc userSvc;
    public static class Login {
        // Inject here is not filled : NPE
        @Inject UserSvc userSvc;
        public String email;
        public String password;
        public String validate() {
            // How can I use userSvc here ?
        }
    }

    @Transactional(readOnly = true)
    public Result authenticate() {
        Form<Login> loginForm = form(Login.class).bindFromRequest();

        if (loginForm.hasErrors()) {
            return badRequest(login.render(loginForm));
        } else {
            Secured.setUsername(loginForm.get().email);
            return redirectConnected();
        }
    }
}

推荐答案

Play Framework 表单不可依赖注入并且与 userService 具有不同的作用域，因此您无法注入您的通过注释将依赖项转换为登录表单.试试这个:

Play Framework forms are not dependency injectable and have different scope than userService, thus you cannot inject your dependencies into Login form by annotation. Try this:

public String validate() {
    UserSvc userSvc = Play.application().injector().instanceOf(UserSvc.class);
}

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