Working with interface and types on golang

Question

I'm working on a generic implementation of a paginator for DB queries with GORM

type Cursor struct {
    Data []interface{}
    Next int
}

type Paginator struct {
    PageSize int
    Model    interface{}
}

The problem is, I don't know how to instantiate a new array to retrieve results from DB depending on the Paginator.Model type with this line

db.Model(paginator.Model).Limit(paginator.PageSize).Offset(page - 1).Find(&data)

How can I instantiate data to work with Find ?

Answer 1

Is your issue not knowing how to create a slice?

You can do:

var data []interface{}{} // make an empty slice of type interface{}

if you are trying to create a Custor struct, you can also do:

c := Cursor{Data: []interface{}{}}

Playground