Mongoose Tree Schema

branch.js

// An excerpt from a Mongoose model.js file for use with Express:

    // Sub-document to store parent ref along with it's value (a form of caching)
    var Parent = new Schema({
        id: ObjectId
      , text: String
    });

    // Main tree-node element schema
    var Branch = new Schema({
        text: {
            type: String
          , required: true }
      , date: {type: Date, default: Date.now }
      , trail: [Parent]
      , parentBranchId: ObjectId
      , parentBranch: { type: Schema.Types.ObjectId, ref: 'Branch' }
      , _children: [{type: Schema.Types.ObjectId, ref: 'Branch'}]
      // These two have been commented out because I have no clue how to best implement 
      // , _priorSiblings: { type: Schema.Types.ObjectId, ref: 'Branch' }
      // , _followingSiblings: { type: Schema.Types.ObjectId, ref: 'Branch' }
    });