How do you Embed Multiple Structs with Identical Names in Go?

Embedding Multiple Structs with Identical Names

In Go, embedding multiple structs with the same name can pose a challenge, potentially resulting in duplicate field errors. This article explores a solution to this scenario, allowing you to effectively embed structs without such conflicts.

Problem Statement

Consider the following code snippet:

<code class="go">type datastore struct {
    *sql.Store
    *file.Store
}</code>

This code attempts to embed two structs, *sql.Store and *file.Store, with the same name, Store, within the datastore struct. However, it results in a duplicate field error, as the compiler is unable to distinguish between the two embedded fields.

Solution

To resolve this issue, you can utilize a type alias for one of the embedded structs. This creates an alternative name for the referenced type, allowing it to be embedded alongside the other struct without causing any naming conflicts.

<code class="go">type SqlStore = sql.Store // this is a type alias

type datastore struct {
    *SqlStore
    *file.Store
}</code>

In this scenario, SqlStore becomes an alias for sql.Store, introducing a new name for the same type. As a result, when embedding both SqlStore and file.Store within datastore, they are recognized as distinct fields, eliminating the duplicate field error.

Benefits of Using a Type Alias

By using a type alias, you can:

• Maintain type safety: The type alias ensures that the embedded field conforms to the original type.
• Avoid confusion: The explicit use of the type alias eliminates any ambiguity in identifying the embedded field.
• Enhance code readability: The type alias provides a clear and concise representation of the embedded type.

Alternative Approaches

Alternatively, if embedding structs with identical names is not necessary, you could consider the following options:

• Use a different name for the embedded field, avoiding the naming conflict altogether.
• Create a composed type that combines the logic of both *sql.Store and *file.Store. This approach decouple the structures and eliminates the need for direct embedding.

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