[Feature Request] Update function on existing structures about storm HOT 4 CLOSED

I think a update function for one field in a structure will be great, now I must pass all info with a structure is not so good.

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You don't need to delete in db to update your structure.

type User struct {
  ID int
  Name string
  Age int
}

db.Save(&User{
  ID: 1,
  Name: "John",
  Age: 10,
})

...

// now if you want to update the age field
// First fetch your user
var u User
db.One("ID", 1, &u)

// then update the field
u.Age = 20

// then save
db.Save(&u)

Of course, a function that would avoid fetching the object first would be great

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To update, we need:

• an instance of the type, so we can decode the record in it
• the bucket name
• the ID
• the fields to update
• the new values to set

So I was thinking about something like this:

err := db.Update(&User{ID: 1, Age: 20})

Basically, you pass an object with the values that need to change (plus the ID).
The good side is that you can update several fields at a time.
The downside is that if you want to set a field to a zero value you can't.

So we can add another function

err := db.UpdateField(&User{ID: 1}, "Age", 0)

You can only update one field
But you can set it to a zero value

@hardcoar @Comdex what do you guys think?

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@asdine I think so

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