How to Parse YAML Files with Dynamic Keys in Go?

YAML parsing Go code with dynamic keys

To parse Go code with dynamic keys in a YAML file, follow these steps:

1. Install the yaml library:

<code class="sh">go get gopkg.in/yaml.v2</code>

2. Define the model structure:
Create a structure to represent YAML data. If you know all possible keys you can define them using regular fields, otherwise you can use map[string]interface{} fields to contain dynamic keys.

3. Use a custom Unmarshaler (optional):
If you need to customize how YAML data is parsed, you can use a custom Unmarshaler. This can help you handle dynamic keys or other complex parsing scenarios.

4. Parse YAML data:
Use the yaml.Unmarshal function to parse the YAML data and deserialize it into a model structure.

Example:
The following example demonstrates how to parse a YAML file with dynamic keys:

<code class="go">package main

import (
    "fmt"

    "gopkg.in/yaml.v2"
)

var data = `
---
development:
  skip-header-validation: true
  V1:
    current: "1.0.0"
    mime_types:
      - application/vnd.company.jk.identity+json;
      - application/vnd.company.jk.user+json;
      - application/vnd.company.jk.role+json;
      - application/vnd.company.jk.scope+json;
      - application/vnd.company.jk.test+json;
    skip-mime-type-validation: true
    skip-version-validation: true
  V2:
    current: "2.0.0"
    mime_types:
      - application/vnd.company.jk.identity+json;
      - application/vnd.company.jk.user+json;
      - application/vnd.company.jk.role+json;
      - application/vnd.company.jk.scope+json;
      - application/vnd.company.jk.test+json;

`

type MajorVersion struct {
    Current                 string   `yaml:"current"`
    MimeTypes               []string `yaml:"mime_types"`
    SkipVersionValidation  bool     `yaml:"skip-version-validation"`
    SkipMimeTypeValidation bool     `yaml:"skip-mime-type-validation"`
}

type Environment struct {
    SkipHeaderValidation bool
    Versions             map[string]MajorVersion `yaml:",inline"`
}

func main() {
    e := map[string]Environment{}
    if err := yaml.Unmarshal([]byte(data), &e); err != nil {
        fmt.Println(err.Error())
    }
    fmt.Printf("%#v\n", e)
}</code>

Output:

map[string]main.Environment{
    "development": {
        SkipHeaderValidation: true,
        Versions: {
            "V1": {
                Current:                "1.0.0",
                MimeTypes:              {"application/vnd.company.jk.identity+json;", "application/vnd.company.jk.user+json;", "application/vnd.company.jk.role+json;", "application/vnd.company.jk.scope+json;", "application/vnd.company.jk.test+json;"},
                SkipVersionValidation:  true,
                SkipMimeTypeValidation: true,
            },
            "V2": {
                Current:                "2.0.0",
                MimeTypes:              {"application/vnd.company.jk.identity+json;", "application/vnd.company.jk.user+json;", "application/vnd.company.jk.role+json;", "application/vnd.company.jk.scope+json;", "application/vnd.company.jk.test+json;"},
                SkipVersionValidation:  false,
                SkipMimeTypeValidation: false,
            },
        },
    },
}

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