How Can I Avoid Code Redundancy When Returning Dynamically Typed Structs in Go?

Returning Dynamically Typed Structs in Golang

In Golang, it is common to encounter code redundancy when returning structs of the same data type from different functions. This redundancy arises due to the requirement to specify the exact type of the returned struct, even when the data type remains consistent.

To address this redundancy and simplify code, one approach is to consider returning an interface{} instead of a specific type. This allows the function to return structs of different types, which can then be cast or switched into their specific types as needed.

To implement this approach, consider the following function:

func ReturnModels(modelName string) interface{} {

}

In this case, the function accepts a string parameter that represents the model name. Based on the model name, the function can retrieve the corresponding data from a database or other source and return the data as an interface{}.

To use this function, you can then perform type assertions or type switches on the returned interface{} to extract the specific type of data you need. For instance, the following code snippet demonstrates how to obtain and cast a list of brands and posts from the database:

if brands, ok := ReturnModels("brands").([]Brand); ok {
    fmt.Printf("%v", brands)
}

if posts, ok := ReturnModels("posts").([]Post); ok {
    fmt.Printf("%v", posts)
}

By using an interface{} as the return type, you can effectively eliminate code redundancy and consolidate the logic for returning different types of structs. This approach is particularly useful when dealing with a diverse range of models that share similar data structures.

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