Question

I have an app in the works for use internally as a project/task tracker in the company that I’m working for. Playing around with MongoDB atm. I have the following pseudo-schema in mind:

task
    _id
    name
    project
    initial_notes
    versions
        number
        versions
            version_1
                worker
                status
                date(if submitted)
                review_notes(if rejected)
                reply_on(if accepted/rejected)
            (version_n)(if any)

The problem that I’m having is with versioning the task. I’ve read a number of possible ways but I’m falling short of understanding them all the way through. I read something that I liked here and really like the way mongoid does it’s versioning

Thinking of it better I’d rather have it something like this

task
    _id
    versions
        number_of_versions: 3
        current_version
            version_no: 3
            worker: bob
            status: accepted
        old_versions
            version
                version_no: 2
                worker: bob

I would like to show the most recent version only when displaying a collection of tasks and I would like to show all versions of a particular task when entering the detailed information page for that particular task. Would this structure work? If yes, what would be some queries needed to run in order to achieve what I need?

Thank you in advance for your time reading this and maybe answering it.
status: rejected
version
version_no: 1
worker: smith
status: rejected

Answer 1

Yes, why not. That scheme would work. Also, have you considered something like this:

task 
    ...
    versions = [       # MongoDB array 
        {   version_id 
            worker
            status
            date(if submitted)
            review_notes(if rejected)
            reply_on(if accepted/rejected)
        },
        { version_id : ... }, 
        ... 

Possible version insertion query:

tasks.update( { # a query to locate a particular task}, 
              { '$push' : { 'versions', { # new version } } } )

Note, that retrieving the last version from the versions array in this case is done by the program, not by Mongo.