


Dynamic Struct Type Return in Golang
In Revel projects, there can often be significant redundancy in return types across different models.
Consider these two functions:
func (c Helper) Brands() []*models.Brand { // Select from rethinkdb and populate models.Brand var brands []*models.Brand rows.All(&brands) return brands } func (c Helper) BlogPosts() []*models.Post { // Select from rethinkdb and populate models.Post var posts []*models.Post rows.All(&posts) return posts }
Both functions return the same type of data (pointers to slices of structs). To reduce redundancy, one idea is to create a generic return function that returns an interface{} capable of representing different types.
func (c Helper) ReturnModels(modelName string) interface{} { // Select from rethinkdb based on modelName and return interface{} }
With this approach, there would be only one return function, simplifying code and reducing redundancy.
However, it's important to note that returning interface{} comes with caveats:
- Loss of type information: The compiler will no longer be able to enforce type safety, so casting will be necessary before using the returned value safely.
- Type switches and assertions: Casting will require using type switches or assertions, which can lead to additional complexity and potential errors.
The following code example demonstrates this approach:
package main import "fmt" type Post struct { Author string Content string } type Brand struct { Name string } var database map[string]interface{} func init() { database = make(map[string]interface{}) brands := []Brand{ {Name: "Gucci"}, {Name: "LV"}, } database["brands"] = brands posts := []Post{ {Author: "J.K.R", Content: "Whatever"}, } database["posts"] = posts } func main() { fmt.Println("List of Brands:") if brands, ok := ReturnModels("brands").([]Brand); ok { fmt.Printf("%v", brands) } fmt.Println("\nList of Posts:") if posts, ok := ReturnModels("posts").([]Post); ok { fmt.Printf("%v", posts) } } func ReturnModels(modelName string) interface{} { return database[modelName] }
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