Nested tasks

To make our simple task list app a little more interesting, we'll add the ability to nest tasks. In other words, we'll allow some tasks to be subtasks of other tasks. Doing so requires only a slight change to our model, for example adding a ParentId property:

public class Task
{
  public string Description { get; set; }
  public bool IsComplete { get; set; }
  public string ParentId { get; set; }
  public bool Type { get { return "task"; } }
}

There are numerous ways to set up a user interface to allow parent tasks to be set. In the interest of brevity, we'll assume that our create and edit actions and views have two simple additions:

#get all tasks returned by the  
#all_incomplete view in the tasks design document
tasks = client.query("tasks", "all_incomplete")

#when saving tasks, assign the parentId
task.parent_id = request.form["parentId"]

#pass the tasks to the view
#model passed only for edit
return render_template("index.html", model=task, tasks=tasks) 

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