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When dealing with JSON data in Go, marshalling is often preferred over manually constructing JSON strings. This holds true for the Terraform JSON format used to express infrastructure configurations. However, a common challenge arises when encountering dynamic JSON keys, such as the random "web1" name in the provided example.
The question posed is: how to handle such dynamic JSON keys using Go's field tags (e.g., json:"aws_instance")?
Unfortunately, Go's field tags do not directly support dynamic keys. The provided solution attempts to use field tags to represent the static keys ("resource" and "aws_instance"), but fails to address the dynamic key "web1."
As an alternative, the answer proposes using a map to represent the dynamic keys, allowing for values to be assigned at runtime.
In this example, AWSInstance becomes a map keyed by dynamic names (e.g., "web1"). The map can then be populated with specific values as needed.
By using a map, dynamic JSON keys can be easily handled in Go, enabling marshalling to be used effectively in scenarios where field tags are insufficient.
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