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Version 4 (modified by martin, 10 years ago) (diff)

better structure on the steps that are to be done

This Model is still in the design phase. If you have comments or ideas feel free to add them.

Current Access Model

  • access rights are defined in the picture
  • access rights can only be modified by its owner
  • permissions can be set for group, phtagr users that are logged in and the rest of the world
  • users can create groups that are controlled by the group creator
  • pictures can belong to one and only one group

This model works well, but is very restrictive and hard to understand for non-geeks.

New Access Model

  • access rights are defined in groups
  • access rights can be defined by group moderators
  • users can search, create, and join groups
  • pictures can belong to more than one group
  • for each user there is a private group in which all pictures of the users are
  • members of a group can add own pictures to the group

Advantages of the New Model

The new model better represents the way we would share without internet galleries. We would meet up with friends after a trip, exchange pictures and everyone is happy. We do not have to think for each picture what the access rights should be, instead we rather think with whom we want to share them.

An Example

If a member Josh wants to share pictures with only a group (say his amateur drama group).

Flaws in the Current Model

  • Josh has to add each of the group members manually, if Josh is away on a world trip and currently has no internet, new members of the drama group would have no way to join the group!
  • Even though this group all of them want to share with each other, only Josh is able to add pictures to this group, since it is his group.

Solution with the New Model

Josh would create a group, add a few or all the members as Moderators to the group. The moderators can then add new members while Josh is away. And as each member can add pictures in that group also the second problem is solved!

Steps to do

This is an incomplete list of things that have to be done:

Specifications / Definitions / Repository

  • Create svn branch branches/phtagr-multiple-group-access-model for this non-minor change
  • Access rights granularity
    • tagging
    • download full-size pictures
    • (more?)
  • User Roles
    • owner: can assign moderators and perform everything else a moderator can
    • moderator: can add/invite/delete users
    • member: is allowed to view and assign images to the group


  • Database Schema (config/sql/schema.php)*
    • Change relationship between model Media and model Group from "Media hasMany Group" to "Media hasAndBelongsToMany"
    • Delete "group_id" in Media model
    • Add hasAndBelongsToMany table "groups_media" with "group_id" and "media_id"
    • Add fields to Group schema: flags (int), acl (int), description (text)


  • Behaviour
    • Create GroupAccess behaviour (models/behaviours/group_access.php) which handles all the new access stuff and all its "magic". See (basically behaviours enriches a model class with a behaviour and all functions of the behaviour is callable from the model itself)
    • Add GroupAccess to behaviour to Media model
    • Adapt access management to the behaviour and adapt the code, e.g. FileManager?, WebDAV, etc
  • MVC
    • Adapt the group model/view/controller
    • Add database initialisation of public groups in the setup to ensure required groups
    • On user creation create private user group
    • Create user profile with all public group
    • Add a group search
    • Write schema migration script like vendor/shells/upgradeMediaSchema.php to ensure migration of older phtagr versions


  • Write documentation for new access model
  • Test it and merge it to the trunk
  • Shout "We rule the world"