如何在Go lang中将数据从控制器传递到表单？

Question

I have a handler / controller that takes in an http request.

func UpdateHandler(request *http.Request) {
    ID := mux.Vars(request)["ID"]
    UpdateForm.Save(ID,db)
}

Then I have a form that I want to process the data and eventually update it.

type UpdateForm struct {
    ID              string            `json:"type"`
}

func (UpdateForm) Save(db mongo.Database) {
    id := ID
    repository.Update(Id)
}

Go will print out undefined ID

How can I make sure that the form gets the value from the controller?

Answer 1

I think it has nothing to do with the handler, but your code isn't consistent. This line

UpdateForm.Save(ID,db)

The method Save() takes two arguments, while the original method signature takes only a single mongo.Database type argument.

Here is what I assume was your intention:

type UpdateForm struct {
    ID     string   `json:"type"`
}

func (u UpdateForm) Save(db mongo.Database) {
    id := u.ID
    repository.Update(id)
}

// UpdateForm instance somewhere
var u = UpdateForm{}

func UpdateHandler(request *http.Request) {
    u.ID := mux.Vars(request)["ID"]
    u.Save(db)
}