Its not possible to set a new value at the root of the yaml about dyno HOT 4 CLOSED

May be we should add the values to the root in case of no paths specified

from dyno.

I thought about this in the past, and I decided to not allow it for consistency reasons.

For example Append() and Delete() when modifies a slice, the new slice value must be "set back". If the value you append to or delete from is the "root", the implementation would not be able to set it back (unless a pointer to it would be passed), it would have to be returned.

I agree that it could be useful in case of Set. So I'm not completely "shutting" down this idea.

On the other hand this would not be a significant gain. For example when you unmarshal your source YAML, you know it's a map, so you may unmarshal it right into a map. And if you already have your root as a map, you can simply set top-level elements using simple index expressions (e.g. src["field3"] = 123), without the need of dyno.

from dyno.

Ok, stop the press!

Your task does not require any addition or change to dyno, it is supported with how everything is now.

You say you want to add a new field3 field, so that is the path you want to set.

For example, let's say you want to add the new "field3" = 999 entry. This is all it takes:

if err := dyno.Set(m, 999, "field3"); err != nil {
	panic(err)
}

Here's a complete runnable app doing that:

package main

import (
	"encoding/json"
	"os"

	"github.com/icza/dyno"
)

func main() {
	m := map[string]interface{}{
		"field": map[string]interface{}{
			"test":  123,
			"test2": 123443,
		},
		"field2": "sdfsdf",
	}

	if err := dyno.Set(m, 999, "field3"); err != nil {
		panic(err)
	}
	enc := json.NewEncoder(os.Stdout)
	enc.SetIndent("", "  ")
	if err := enc.Encode(m); err != nil {
		panic(err)
	}
}

Output of the above app:

{
  "field": {
    "test": 123,
    "test2": 123443
  },
  "field2": "sdfsdf",
  "field3": 999
}

from dyno.

With the above solution, I consider this closed. If you want something else, or I misunderstood, I may reopen the issue or create a new one.

from dyno.