根目录中定义的闭包在子级中不可见 [英] Closure defined in root not visible in child

问题描述

我有根项目和子项目(:child). 根构建看起来像这样:

I have root project and subproject (:child). Root build looks like like this:

def foo = {
  println("foo")
}

allprojects {
  task bar << {
    println(project.name + ":bar")
  }

  afterEvaluate {
   foo()
  }
}

正在运行gradle bar打印:

foo
foo
:bar
:child:bar
child:bar
parent:bar

这很有道理.但是，IRL我需要foo由孩子的构建文件调用(因为我希望仅由某些子模块调用它). 文档似乎很清楚:In a multi-project build, sub-projects inherit the properties and methods of their parent project

This make sense. However, IRL I need foo to be called by the child's build file (because I want it to be called only by some of the submodules). The documentation seems to be clear enough: In a multi-project build, sub-projects inherit the properties and methods of their parent project

但是，将上面的"afterEvaluate"块移到child/build.gradle中会导致错误:Could not find method foo() for arguments [] on project ':child' of type org.gradle.api.Project.

However, moving the "afterEvaluate" block above into child/build.gradle results in an error: Could not find method foo() for arguments [] on project ':child' of type org.gradle.api.Project.

为什么会发生这种情况，我该如何解决?我尝试了很多不同的变化-将def移动(到buildscript，allprojects，ext，allprojects.ext，使其在ext中成为变量，而不是方法等). ，以不同的方式引用它(例如rootProject.foo，rootProject.foo()，ext.foo()等)-似乎没有任何效果.

Why does this happen and how do I fix this? I have tried a whole bunch of different variations - moving the def around (to buildscript, allprojects, to ext, to allprojects.ext, making it a variable in ext, instead of a method etc.), referring to it differently (as rootProject.foo, rootProject.foo(), ext.foo() etc.) - nothing seems to work.

有什么想法吗?

推荐答案

需要在ext名称空间中声明各种变量，以便将它们传播到下游.试试:

Vars need to be declared in the ext namespace for them to be propagated downstream. Try:

ext.foo = {
  println("foo")
}

ref: https://docs.gradle .org/current/dsl/org.gradle.api.plugins.ExtraPropertiesExtension.html

这篇关于根目录中定义的闭包在子级中不可见的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！