Change parent state from child issue

Hi,

I'm trying to use the javascript workflow and I have to say it's not so easy.

Right now I need to do a pretty simple thing : when a subtask with Type "task" comes to State "in progress", parent task, if it has Type "user story", must come to State "in progress" too. Simple.

I wrote this :

```

exports.rule = entities.Issue.onChange({
// TODO: give the rule a human-readable title
title: 'In-progress-task-to-story',
guard: function(ctx) {
// TODO specify the conditions for executing the rule
return true;
},
action: function(ctx) {
// TODO: specify what to do when a change is applied to an issue
var issue = ctx.issue;
if (issue.fields.becomes(ctx.State, ctx.State['In Progress'])) {
var parent = issue.links['subtask of'].first();
if (parent.type == 'user story' && parent.fields.State != 'in progress') {
parent.fields.State = 'in progress';
}
}
},
requirements: {
// TODO: add requirements

}
});

```

Based on what I found in the doc, but for example `ctx.State`is undefined.
I couldn't find any detailed reference doc, just a few examples and tutorials.
Thanks for your help.

Regards

Laurent