How to Embed Structs with Identical Names in a Go Struct?

Embedding Structs with Identical Names in a Struct

The question focuses on embedding two structs with the same name in a single struct. Typically, attempts to do so result in a duplicate field error, as exemplified by the following code snippet:

type datastore struct {
    *sql.Store
    *file.Store
}

Type Alias as a Solution

To circumvent this issue, the recommended solution is to utilize a type alias. By assigning an alternative name to one of the embedded structs, the Go compiler distinguishes between the two instances. Consider the following modified code:

type SqlStore = sql.Store // this is a type alias

type datastore struct {
    *SqlStore
    *file.Store
}

In this scenario, SqlStore serves as an alias for the original sql.Store type. Therefore, the embedded fields within datastore are now differentiated as *SqlStore and *file.Store, effectively resolving the duplicate field conflict.

Benefits of a Type Alias

Unlike traditional type declarations, a type alias does not introduce a separate new type. Instead, it simply creates an alternate name for an existing type. As a result, it preserves the original type's behavior and characteristics. By leveraging a type alias, developers can avoid modifying the underlying implementation while maintaining compatibility with external code.

Alternate Options

Apart from type aliases, there are several alternative approaches to achieving the desired functionality:

• Create a wrapper struct: Define a new struct that encompasses both embedded structs, effectively creating a container for them.
• Implement interface embedding: Use interface embedding to implement the desired functionality without directly embedding the structs. This provides greater flexibility and decoupling.
• Utilize composition: Compose the desired functionality through separate structs, avoiding the need for embedding. This approach promotes encapsulation and modularity.

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