golang的struct重用方法

Question

I am learning go and was looking at a simple go example web app: https://github.com/campoy/todo/blob/master/task/task.go

Having struct:

    type Task struct {
        ID    int64  // Unique identifier
        Title string // Description
        Done  bool   // Is this task done?
    } 

and

    // TaskManager manages a list of tasks in memory.
    type TaskManager struct {
        tasks  []*Task
        lastID int64
    }

There are methods on the TaskManager func (m *TaskManager) Save(task *Task) error ... func (m *TaskManager) All() []*Task...

I am wondering how to generalize TaskManager into Manager, so it would have these same methods (namely: save, all, find) so it can be used on different structs, for example Users, which would all have ID field.

I assume constructing an array of general type doesn't fit because there is an ID in 'save' and 'find' methods

Answer 1

You'll probably want to write an interface for structures that have an ID, then generalize your Manager to operate on elements of that interface instead of elements of a specific struct.