颤动反射与可反射：需要工作示例 [英] Flutter Reflection with Reflectable: working example needed

问题描述

我想使用 Flutter 和可反射包。为了使二进制文件简短，此程序包使用代码生成。

I want to achieve reflection in a cross-platform (iOS, Android) project using Flutter and the Reflectable package. To keep the binaries short, this package uses code generation.

但是，遵循教程/自述文件此程序包，我无法生成所需的代码，在这种情况下，文件为main.reflectable.dart。当我到达一切正常的地步时，代码生成以以下语句结束：

However, following the tutorial/readme of this package, I am not able to generate the needed code, in this case the file main.reflectable.dart. While I have reached the point where things work without error, code generation concludes with the statement:

[INFO] Succeeded after 88ms with 0 outputs

在下面的内容中，我尝试显示我所做的操作的可复制路径。为此，我将flutter移到了其他路径并重新安装，但没有在IntelliJ IDEA中重新安装flutter插件。

In the following I try to show a reproducible path of what I did. For that I moved flutter to a different path and reinstalled it, but didn't reinstall the flutter plugin in IntelliJ IDEA.

如何复制/我做了什么？

I）在Mac上照常安装Flutter 。在命令行上：

cd ~/development 
git clone -b beta https://github.com/flutter/flutter.git 
export PATH=/Users/yourname/development/flutter/bin:$PATH 
flutter doctor

II）在IntelliJ IDEA中创建新的Flutter项目

1. 选择SDK路径：/ Users /您的名字/开发/ flutter


2. 选择项目位置：〜/ gitroot / PlayGround / reflectable_test_2


3. 添加与lib平行的目录entry_point目录


4. 在目录entry_point内添加飞镖文件main.dart


5. 从 https://github.com/dart-lang/reflectable （很多都会显示为红色）


6. 从lib目录中删除main.dart（未选中安全删除和在评论中搜索）


7. 在测试目录中删除widet_test.dart


8. 添加可反射的：依赖项下的pubspec.yaml


9. 在main.dart中，单击运行，然后在随后出现的对话框中将入口点设置为/ Users /您的名字/ gitroot / PlayGround / reflectable_test_2 / entry_point / main .dart

1. Choose SDK path: /Users/yourname/development/flutter
2. Choose project location: ~/gitroot/PlayGround/reflectable_test_2
3. Add directory entry_point parallel to lib directory
4. Add dart file main.dart inside directory entry_point
5. Get the content for main.dart from the main.dart in https://github.com/dart-lang/reflectable (a lot will be shown red)
6. Delete main.dart from lib directory (unchecked "safe delete" and "search in comments")
7. Delete widet_test.dart in test directory
8. Add "reflectable: any" to pubspec.yaml under dependencies
9. In main.dart, click run and in the upcoming dialog set the entry point to /Users/yourname/gitroot/PlayGround/reflectable_test_2/entry_point/main.dart

加载依赖项时，一些红色的摆动将消失，但不会出现在 import主体中。

When the dependencies are loaded, some of the red wiggles will go away, but not the one in "import 'main.reflectable.dart';", since this file does not exist yet.

III）尝试使用生成器生成main.reflectable.dart 。在命令行上：

III) Try to generate main.reflectable.dart with the builder on the command line:

cd /Users/yourname/gitroot/PlayGround/reflectable_test_2/
flutter packages pub run build_runner build entry_point

请注意，本教程仅说

pub run build_runner build DIR

但使用的行在Flutter项目中使用时确实正确。。按照到目前为止的自述文件/教程，我得到了以下结果：

but the used line is indeed correct when used in a Flutter project. Following the readme/tutorial so far, I got the result:

Package "build_runner" is not an immediate dependency.
Cannot run executables in transitive dependencies.
pub finished with exit code 65

IV）在IntelliJ中，添加 build_runner：any到pubspec.yaml中的dev_dependencies。在命令行上再次运行（flutter包pub run build_runner build entry_point）。这将导致输出：

IV) In IntelliJ, add "build_runner: any" to dev_dependencies in pubspec.yaml. Run again on the command line (flutter packages pub run build_runner build entry_point). This results in the output:

[INFO] Generating build script...
[INFO] Generating build script completed, took 506ms

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 776ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 3ms

[INFO] Running build...
[INFO] Running build completed, took 7ms

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 69ms

[INFO] Succeeded after 88ms with 0 outputs

总而言之，没有错误，但也没有创建文件main.reflectable.dart（0个输出）。我该怎么办才能解决此问题？

To summarise, no errors, but it didn't create the file main.reflectable.dart either (0 outputs). What can I do to fix this?

推荐答案

也许唯一要做的事情就是要做

Maybe the only missing bit is to do

flutter包pub run build_runner build entry_point / main.dart

或添加 build.yaml 文件

目标：
test_reflectable：
建设者：
可反映：
generate_for：
-entry_point / main.dart


编辑：此处是一个示例存储库，可用于作为在Flutter中可反射性的非常简单的起点。

Here's an example repo which may serve as a very simplistic starting point for reflectable in Flutter.

编辑2：有一个白名单 pub 支持入口点（ Dart程序）和 entry_point 不在该列表中。尝试使用白名单中存在的目录。

Edit 2: There is a whitelist of locations where pub supports entry points ("Dart programs"), and entry_point is not on that list. Try using a directory which is present in the whitelist.

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