Why is My Go Struct Empty After YAML Unmarshaling?

Unmarshaling YAML into Go Struct: Why Your Data Remains Empty

When unmarshaling YAML into a Go struct, it's essential to ensure that the struct's fields are exported. This means that they should start with an uppercase letter, allowing the YAML library to access them.

Let's examine the code snippet you provided:

type Config struct {
    foo_bar string
}

In this code, the field foo_bar is not exported. To correct this, update the code as follows:

type Config struct {
    FooBar string `yaml:"foo_bar"`
}

By adding the yaml:"foo_bar" tag, we explicitly specify the YAML key for this field. Additionally, the field name FooBar is now exported, allowing the unmarshaling process to bind the YAML data to your struct.

Once the field is exported, you can confidently unmarshal the YAML data into the Config struct, and the FooBar field will be correctly populated.

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