YAML 1.2锚点在js-yaml 3.10.0中不起作用？ [英] YAML 1.2 anchors not working in js-yaml 3.10.0?

问题描述

使用 YAML锚点时=https://www.npmjs.com/package/js-yaml =nofollow noreferrer> js-yaml 3.10.0 包（这是一个很好的使用它的例子这里）我收到以下错误：

When loading YAML anchors in node.js (v4.8.7) using the js-yaml 3.10.0 package (there's a nice example of using it here) I get the following error:

无法合并映射;提供的源对象是不可接受的

"cannot merge mappings; the provided source object is unacceptable"

例如在我输入的yaml文件中，我有类似以下内容作为我的锚：

For instance in my input yaml file I have something like the following as my anchor:

defaultEd: &defaultEd
  - 'Pennsylvania College of Technology AS'
  - 'Pennsylvania College of Technology BS'

在输入yaml文件中引用锚点的地方我有以下内容：

And where the anchor is referenced in my input yaml file I have the following:

...
education:
  <<: *defaultEd
qs:
  - 'Reading'
  - 'Writing'
...

我希望在我的输出中完成以下内容：

I'm hoping to accomplish the following in my output:

education:
  - 'Pennsylvania College of Technology AS'
  - 'Pennsylvania College of Technology BS'

错误显示如下：

{ [YAMLException: cannot merge mappings; the provided source object is unacceptable at line 21, column 1:
    qs:
    ^]
  name: 'YAMLException',
  reason: 'cannot merge mappings; the provided source object is unacceptable',
  mark: 
   Mark {
     name: null,
     buffer: 'defaultEd: &defaultEd\n  - \'Pennsylvania College of Technology AS\'\n  - \'Pennsylvania College of Technology BS..
 <<: *defaultEd\nqs:\n  - \'Reading\'\n  - \'Writing\'\n  - \'Rithmatick\'\nexperience:\n  - {posName: \'Database Analyst / Net Tech\', companyName: \'Choices People Supporting People\'}\n\u0000',
     position: 435,
     line: 20,
     column: 0 },
  message: 'cannot merge mappings; the provided source object is unacceptable at line 21, column 1:\n    qs:\n    ^' }
Error View file does not exist: someTest.yml

推荐答案

您可能误解/混淆了别名和合并键的使用<< ; 。

You probably misunderstood / mixed up the usage of aliases and the merge key <<.

YAML中的任何节点都可以附加锚点：

Any node in YAML can have an anchor attached:

---
mapping: &map
  a: 1
  b: 2
sequence: &seq
  - a
  - b
scalar: &scalar foo
mapping-alias: *map
sequence-alias: *seq
scalar-alias: *scalar

合并密钥<< ，这不是YAML的一部分规范本身，由一些处理器支持。它允许您将别名映射合并到另一个映射中。

The merge key <<, which is not part of the YAML spec itself, is supported by some processors. It lets you merge an aliased mapping into another mapping.

defaults: &defaults
  a: 1
  b: 2
# .....
some-mapping:
  <<: *defaults
  c: 3

请参阅 http://yaml.org /type/merge.html

YAML中的映射通常在编程语言中称为字典，散列或有时是对象（Javascript）。

A mapping in YAML is usually called a dictionary, hash or sometimes object (Javascript) in programming languages.

在您的情况下，您可能只想：

In your case, you probably just want:

education: *defaultEd

这篇关于YAML 1.2锚点在js-yaml 3.10.0中不起作用？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！