Responsible: Kostis Pristouris

Background

As part of the deck model we define a model for storing the changes applied to the deck after each save or other action on the UI that results to a deck change, with or without creating a new revision. See also SWIK-946 - Getting issue details... STATUS .

The change log is considered to be a list of change log records that include a timestamp and the id of the user performing the deck change. They include the full path of the deck tree were the edit was performed, and are stored in a separate collection, deckchanges in mongodb. Each record may be returned via the deck service changes API as part of the change log for any of the decks that are part of the deck tree.

In this document we describe how all the relevant change log records are stored in the mongodb. The API that handles querying the underlying data in order to provide the change log for a deck tree is the object of SWIK-945 - Getting issue details... STATUS .

Model

Each deckchange record includes a representation for the path of the deck tree were the change was performed. For constructing this path, we use references to decks and indexes for positioning the deck in its parent deck. We also keep the title as optional data in those references, to be used primarily in the UI.

ChangePathPart=

property	type	required	description
id	integer	yes if no index	the id of the deck can be omitted only for the last part of the path for specific change types
revision	integer	yes if id present	the revision of the deck
title	string	no	the title of the deck revision at the time the change took place
index	integer	yes if no id	the (zero-based) index of the deck in the content items array of its parent can be omitted only for the first part of the path (the path root)

To reference nodes in the deck tree we use a simple construct to denote the type of node and its id and revision:

NodeRefValue=

property	type	required	description
id	integer	yes	the id of the deck or slide
revision	integer	yes	the revision of the deck or slide
title	string	no	the tile of the deck or slide at the time the change took place

NodeValue=

property	type	required	description
kind	string	yes	either deck or slide
ref	NodeRefValue	yes	the reference to the deck or slide

In order to describe the specific changes to the deck metadata we maintain a set of specific keys and value types:

UpdateValues=

property	type	required	description
title	string	no	same definition as "title" on the deck revision model
language	string	no	same definition as "language" on the deck revision model
theme	string	no	same definition as "theme" on the deck revision model
license	string	no	same definition as "license" on the deck model
description	string	no	same definition as "description" on the deck model
tags	array	no	same definition as "tags" on the deck revision model

DeckChange=

property	type	required	description
op	string	yes	one of 'add', 'remove', 'replace', 'move', or 'update'
timestamp	date string	yes	iso date string
user	integer	yes
path	array of ChangePathPart	yes	can be empty for the root deck 'update' change
from	array of ChangePathPart	if operation is 'move'	provides the previous path of the node moved in the tree
value	NodeValue	yes if op is 'add', 'remove', 'replace' or 'move'	provides the node value referenced by the change
oldValue	NodeValue	yes if op is 'replace'	provides the node value replaced when creating a revision for a deck child
values	UpdateValues	yes if op is 'update'	provides the new values for the deck data updated
oldValues	UpdateValues	yes if op is 'update'	provides the old values for the deck data updated

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