code: function objectId_jsonSchema(name) {
  
    var result = simpleType_jsonSchema.call(this, name);
  
    result.type = 'string';
    result.pattern = '^[0-9a-fA-F]{24}$';
  
    return result;
  }
docs: objectId_jsonSchema - returns the jsonSchema for ObjectId parameters
  
  @memberof mongoose.Schema.Types.ObjectId
  
  @param  {String} name the name of parameter
  @return {object}      the jsonSchema for parameter