英文:
Marshal dynamic JSON field tags in Go
问题
我正在尝试为Terraform文件生成JSON。因为我（认为我）想要使用编组而不是自己编写JSON，所以我使用了Terraform的JSON格式而不是“本机”的TF格式。
{"resource": [{"aws_instance": {"web1": {"some": "data"}}}]}
在这种情况下，resource和aws_instance是静态标识符，而web1是随机名称。此外，也可以有web2和web3。
type Resource struct {AwsResource AwsResource `json:"aws_instance,omitempty"`}type AwsResource struct {AwsWebInstance AwsWebInstance `json:"web1,omitempty"`}
然而，问题是：如何使用Go的字段标签生成随机/可变的JSON键？
我有一种感觉，答案是“你不能”。那么我还有哪些其他选择呢？
英文:
I'm trying to generate JSON for a Terraform file. Because I (think I) want to use marshalling instead of rolling my own JSON, I'm using Terraforms JSON format instead of the 'native' TF format.
{"resource": [{"aws_instance": {"web1": {"some": "data"}}]}
resource and aws_instance are static identifiers while web1 in this case is the random name. Also it wouldn't be unthinkable to also have web2 and web3.
type Resource struct {AwsResource AwsResource `json:"aws_instance,omitempty"`}type AwsResource struct {AwsWebInstance AwsWebInstance `json:"web1,omitempty"`}
The problem however; how do do I generate random/variable JSON keys with Go's field tags?
I have a feeling the answer is "You don't". What other alternatives do I have then?
答案1
得分: 7
在大多数情况下，当存在在编译时不知道的名称时，可以使用映射（map）：
type Resource struct {AWSInstance map[string]AWSInstance `json:"aws_instance"`}type AWSInstance struct {AMI string `json:"ami"`Count int `json:"count"`SourceDestCheck bool `json:"source_dest_check"`// ... and so on}
下面是一个示例，展示了如何构建用于编组（marshalling）的值：
r := Resource{AWSInstance: map[string]AWSInstance{"web1": AWSInstance{AMI: "qdx",Count: 2,},},}
英文:
In most cases where there are names not known at compile time, a map can be used:
type Resource struct {AWSInstance map[string]AWSInstance `json:"aws_instance"`}type AWSInstance struct {AMI string `json:"ami"`Count int `json:"count"`SourceDestCheck bool `json:"source_dest_check"`// ... and so on}
Here's an example showing how to construct the value for marshalling:
r := Resource{AWSInstance: map[string]AWSInstance{"web1": AWSInstance{AMI: "qdx",Count: 2,},},}
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