I cannot unmarshal yaml file what I'm doing wrong ?

[Feyyaz Esatoglu]

Hi,

I checked out the best practices I think I did same but there is no sign that yaml unmarsahlling the file.

I can see file content after stringing ioutil.ReadFile but the problem occuring while parsing, and there is no error just returns value as empty map.

My Code :

https://play.golang.org/p/enii8ldkvm

The Yaml File: https://gist.github.com/441284d121af3335b010

Yaml Package :

https://gopkg.in/yaml.v2

Related Blog :

http://blog.labix.org/2014/09/22/announcing-yaml-v2-for-go

Could you please help what I am doing wrong here ?

[Kevin Malachowski]

I'm on mobile so I can't type out any code to help, but what happens if you use the Marshal functions in the yaml package to turn a Go struct into yaml?

Also, are you familiar with struct tags?They look like `json:"fieldname"` for the encoding/json package and are optional for that package, but maybe the yaml package has a similar feature and can help out.

[Kevin Malachowski]

Try making your yaml a pointer, ie &Yaml{}. Right now the call to the UnmarshalYAML method makes a copy, so the "yaml" passed to the fmt.Println is still uninitialized.

[Feyyaz Esatoglu]

nope I'm trying to import yaml file to structs.

in the link playground that I gave above my structs looks like this.

type (

Parameters struct {

keys map[string]string

}

Yaml struct {

parameters Parameters

}

)

and the yaml which is also above with gists link looks like

parameters:
    database_driver: pdo_mysql
    database_host: database.local
    database_port: 3306
    database_name: test

I did try alternatives maps etc. even slices arrays already I know not suitable for string keys but it didin't work

[Harmen B]

On Sun, Feb 15, 2015 at 8:23 PM, Feyyaz Esatoglu <feyya...@gmail.com> wrote:

nope I'm trying to import yaml file to structs.

in the link playground that I gave above my structs looks like this.

type (

Parameters struct {

keys map[string]string

}

Yaml struct {

parameters Parameters

}

)

Those are private fields (they don't start with a capital). Make them Public and try again.

[Kevin Malachowski]

Make sure to check the error returned from MarshalYAML. Mine says there's an unexpected character, I'm debugging now.

[Kevin Malachowski]

Here, hope this helps (I got to a computer): https://play.golang.org/p/XN2NeiD1UX

[Feyyaz Esatoglu]

@Kevin I did commented UnmarshalYaml function to be sure did I initialize the Yaml struct correctly, I think I did ok. But still no sign.

func main() {

var parametersContent *[]byte

var err error

err, parametersContent = readParametersFile(parametersPath)

if err != nil {

panic(err)

}

yaml := Yaml{}

fmt.Println(string(*parametersContent))

yamlParser.Unmarshal(*parametersContent, &yaml)

fmt.Println(yaml)

/*

// UnmarshalYAML not working at the time.

yaml.UnmarshalYAML(parametersContent)

*/

}

@Harmen Capitalized should be Public also it is not important here the privacy valid between packages, not with package itself as I know.

@Kevin how do you debugging ? I think I don't know debugging concept in Go.

[Feyyaz Esatoglu]

Sorry @Harmen I did misunderstand you, you were right the problem grow out of there.

Thanks @Kevin, I did aware @Harmen's mention from your code, also you did marshalling the yaml, I wasn't need it, but it works like a charm!

[Tamás Gulácsi]

Capitalize the fields of the destination strict, as reflect needs so.

[Craig Mason-Jones]

Hi,

There's nothing wrong with your code, except for the capitalization of the fields in Parameters and Yaml structs :-)

The problem is your Parameters struct says:

type (
    Parameters struct {
        Keys map[string]string
    }

    Yaml struct {
        Parameters Parameters
    }
)

The 'real' problem is that your Yaml says:

parameters:
    database_driver: pdo_mysql
    database_host: database.local
    database_port: 3306

    database_name: test

Change your Yaml to:

parameters:

   keys:
     database_driver: pdo_mysql

     database_host: database.local

     database_port: 3306

     database_name: test

The map[string]string is the Keys value of the Parameters object, so you need to reflect this in the Yaml as well, obviously.

All the best,
Craig