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lostplaces-backend/django_lostplaces/docs/developer.md

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django lostplaces documentation for developer

Greetings, this documentation is for anyone who wants to work with this projects codebase or is just curious about how it works.

Models

The models contain an custom user profile, some abstract base models and the models holding the actual data for this project

Explorer user profile

Location: lostplaces.models.models.Explorer
Import from: lostplaces.models.Explorer

Super Classes

  • django's models.Model

The class lostplaces.models.Explorer is our custom user profile. It has an ForeignKey pointing at django's default user model instead of providing an entire custom user model. That way this django app does not conflict with any other app that brings it's own user model.

You can access the explorer profile by accessing the 'explorer' attribute of any user instance

user.explorer

Currently the explorer profile is used by the abstract model 'Submittable' and has the following realated names/fiels:

  • places A list containing all (lost) places the user has submitted
  • placeimages A list containing all images relating a place that a user has submitted
  • photoalbums A list of all photo albums a explorere has submitted

Taggable

Location: lostplaces.models.abstract_models.Taggable
Import from: lostplaces.models.Taggable

Super Classes

  • django's models.Model

The abstract model Taggable represents an model that is taggable. It depends on the django app taggit. It only consists of one field:

  • tag: TaggableManager, allows the sub class to be tagged, blank=True allows the admin form to be submitted without any tags

Mapable

Location: lostplaces.models.abstract_models.Mapable
Import from: lostplaces.models.Mapable

Super Classes

  • django's models.Model

The abstract model Mapable represents an model that can be displayed on a map. It consists of tree attributes
name
Name of the object, displayed on the map, max length 50 characters
latitude
Latitude of the referenced location, -90 <= value <= 90
longitude
Longitude of the referenced location -180 <= value <= 180
A mapable model has to provide its own get_absolute_url, in order to provide a link when clicked.

Submittable

Location: lostplaces.models.abstract_models.Submittable
Import from: lostplaces.models.Submittable

Super Classes

  • django's models.Model

The abstract model Submittable represents an model that can be submitted by an user. It knows who submitted something and when:
submitted_by
Referencing the explorer profile, see Explorer. If the explorer profile is deleted, this instance is kept (on_delete=models.SET_NULL). The related_name is set to the class name, lower case appending an s (%(class)ss)
submitted_when
When the object was submitted, automatically set by django (auto_now_add=True)

Expireable

Location: lostplaces.models.abstract_models.Expireable
Import from: lostplaces.models.Expireable

Super Classes

  • django's models.Model

This abstract model represents an object that can expire. It is currently used by the Voucher model. I consists of two fields: created_when
The date the object was created, automatically set by django (auto_now_add=True)
expires_when
The date the object expires.

Voucher

Locatoin: lostplaces.models.Voucher
Import from: lostplaces.models.Voucher

Super Classes

A voucher code is needed to sign up using lostplaces sign up form. The model contains
code
The voucher code, max length 30 characters created_when
When the voucher was created automatically set by django (auto_now_add=True)
expires_when
Till what date the voucher remains valid

Place

Location: lostplaces.models.place.Place
Import from: lostplaces.models.Place

Super Classes

The place model is the heart of this project. It stores all information about a place needed.
location
Human readable location description (town, village, street), max length 50 characters
description
Describing the place in detail
The place model uses these abstract super classes

  • Submittable, see Submittable for additional fields
  • Taggable, see Taggable for additional fields
  • Mapable, see Mapable for additional fields The average_latlon function takes a list of places and returns the center point of all these places.

PlaceAsset

Location: lostplaces.models.PlaceAsset
Import from: lostplaces.models.place.PlaceAsset

Super Classes

A PlaceAsset is anything that belongs to a place. The PlaceImage model for exmpaple is a subclass of PlaceAsset. A PlaceAsset is supposed to be submittable by every user. Only the user who has submitted the asset, the place the asset belongs to or both can delete a asset.

An PlaceAsset has the following fields place
The Place this PlaceAsset belongs to

The PlaceAsset model is a subclass of Submittable, see Submittable for more details.

External Link

Loacation: lostplaces.models.external_link.ExternalLink
Import From: lostplaces.models.ExternalLink

Super Classes

This model represents an URL to an external website. External Link is an PlaceAsset, see above for more details. External Link has to fields url
the URL to the target label
the label that is shown on the website

PhotoAlbum

Loacation: lostplaces.models.external_link.PhototAlbum
Import From: lostplaces.models.PhotoAlbum

Super Classes

A photo album is a link to an external site that is meant to contain photos of the place it is referenced in. It does not have any fields, just the ones inherited from it's super class ExternalLink.