How to pass columns to orm.update if the number of columns is not known in advance?

Question

go

type My_table struct {
  Id int
  Name string
  Lastname string
}

o := orm.NewOrm()
field := My_table{Id: Id}
num, err := o.Update(&field, "name", "lastname")

There may be a situation where you need to update only one field, for example "name".
The function is created like this:

func (o *orm) Update(md interface{}, cols ...string) (int64, error)

It turns out that I need some kind of structure that would describe this cols ...string and I could add either one "name" field to it , or both "name", "lastname" .
Tell me, is it possible to do this?

Answer 1

In general, everything turned out to be quite simple when you read the manuals carefully.
We make an array with the maximum number of columns that may need to be updated: And then, depending on the condition, we reassign a slice with the necessary elements to it: If we only need the "name" field: And we substitute this array into the update function, with three points, which denote a variable number of arguments:
num, err := o.Update(&device, str...)