英文:
Calling subtemplates from within a loop in Go template
问题
当我在{{ range }}循环之外导入一个子模板时，变量可以成功传递到导入的模板中：
...
{{ template "userdata" . }}
...
（在这里，我可以在内部模板userdata中访问外部模板的变量）。到目前为止都很好。
然而，当在{{ range }}循环内部调用相同方式的导入时，它不起作用：
...
{{ range $instance := .Instances }}
- type: instance
metadata:
userdata: {{ template "userdata" . }}
...
上述代码会报错，错误信息类似于：
Error: template: template.tmpl:3:46: 执行"userdata"时出错，无法在类型int中评估字段XXX`
据我理解，它会用循环迭代变量遮蔽我的上下文变量，所以它不起作用。
我应该如何正确地做这件事？
当在range循环内部时，我如何将.的值传递到模板"userdata"之外？
英文:
When I am importing a subtemplate outside of a {{ range }} loop, variables are passed successfully inside the imported template:
...
{{ template "userdata" . }}
...
(here, I can access my outer templates variables in the inner template userdata). So far so good.
However same fashion import doesn't work when being called inside a {{ range }} loop:
...
{{ range $instance := .Instances }}
- type: instance
metadata:
userdata: {{ template "userdata" . }}
...
Above ends with error messaging out something like:
Error: template: template.tmpl:3:46: executing "userdata" at <XXX>: can't evaluate field XXX in type int`
As far as I understand, it shadow my context variable with the loop iterator variable, and so it does not work.
How am I supposed to do it properly?
How do I pass the value of . outside of the range loop to template "userdata" when inside a range loop?
答案1
得分: 2
将.的值分配给一个变量。在循环中使用该变量：
...
{{$x := .}}
{{ range $instance := .Instances }}
- type: instance
metadata:
userdata: {{ template "userdata" $x }}
...
如果.是模板中的根值，则使用$来引用该值：
...
{{ range $instance := .Instances }}
- type: instance
metadata:
userdata: {{ template "userdata" $ }}
...
在playground上运行它。
英文:
Assign the value of . to a variable. Use the variable in the loop:
...
{{$x := .}}
{{ range $instance := .Instances }}
- type: instance
metadata:
userdata: {{ template "userdata" $x }}
...
If . is the root value in the template, then use $ to refer to that value:
...
{{ range $instance := .Instances }}
- type: instance
metadata:
userdata: {{ template "userdata" $ }}
...
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