django-loci

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Reusable django-app for storing GIS and indoor coordinates of objects.

Table of Contents:

Dependencies
Compatibility Table
Install stable version from pypi
Install development version
Setup (integrate in an existing django project)
Troubleshooting
- Unable to load the SpatiaLite library extension
- Issues with other geospatial libraries
Settings
System Checks
- geocoding
Extending django-loci
Installing for development
Contributing
Changelog
License

Dependencies

Python >= 3.8
GeoDjango (see GeoDjango Install Instructions)
One of the databases supported by GeoDjango

Compatibility Table

django-loci	Python version
0.2	2.7 or >=3.4
0.3 - 0.4	>=3.6
1.0	>=3.7
dev	>=3.8

Install stable version from pypi

Install from pypi:

pip install django-loci

Install development version

First of all, install the dependencies of GeoDjango:

Geospatial libraries
Spatial database, for development we use Spatialite, a spatial extension of sqlite

Install tarball:

pip install https://github.com/openwisp/django-loci/tarball/master

Alternatively you can install via pip using git:

pip install -e git+git://github.com/openwisp/django-loci#egg=django_loci

If you want to contribute, install your cloned fork:

git clone [email protected]:<your_fork>/django-loci.git
cd django_loci
python setup.py develop

Setup (integrate in an existing django project)

First of all, set up your database engine to one of the spatial databases suppported by GeoDjango.

Add django_loci and its dependencies to INSTALLED_APPS in the following order:

INSTALLED_APPS = [
    # ...
    'django.contrib.gis',
    'django_loci',
    'django.contrib.admin',
    'leaflet',
    'channels'
    # ...
]

Configure CHANNEL_LAYERS according to your needs, a sample configuration can be:

ASGI_APPLICATION = "django_loci.channels.routing.channel_routing"
CHANNEL_LAYERS = {
    "default": {
        "BACKEND": "channels.layers.InMemoryChannelLayer",
    },
}

Now run migrations:

./manage.py migrate

Troubleshooting

Common issues and solutions when installing GeoDjango.

Unable to load the SpatiaLite library extension

If you get the following exception:

django.core.exceptions.ImproperlyConfigured: Unable to load the SpatiaLite library extension

You need to specify the SPATIALITE_LIBRARY_PATH in your settings.py as explained in the django documentation regarding how to install and configure spatialte.

Issues with other geospatial libraries

Please refer to the geodjango documentation on troubleshooting issues related to geospatial libraries.

Settings

`LOCI_FLOORPLAN_STORAGE`

type:	`str`
default:	`django_loci.storage.OverwriteStorage`

The django file storage class used for uploading floorplan images.

The filestorage can be changed to a different one as long as it has an upload_to class method which will be passed to FloorPlan.image.upload_to.

To understand the details of this statement, take a look at the code of django_loci.storage.OverwriteStorage.

`DJANGO_LOCI_GEOCODER`

type:	`str`
default:	`ArcGIS`

Service used for geocoding and reverse geocoding.

Supported geolocation services:

ArcGIS
Nominatim
GoogleV3 (Google Maps v3)

`DJANGO_LOCI_GEOCODE_FAILURE_DELAY`

type:	`int`
default:	`1`

Amount of seconds between geocoding retry API calls when geocoding requests fail.

`DJANGO_LOCI_GEOCODE_RETRIES`

type:	`int`
default:	`3`

Amount of retry API calls when geocoding requests fail.

`DJANGO_LOCI_GEOCODE_API_KEY`

type:	`str`
default:	`None`

API key if required (eg: Google Maps).

System Checks

`geocoding`

Use to check if geocoding is working as expected or not.

Run this checks with:

./manage.py check --deploy --tag geocoding

Extending django-loci

django-loci provides a set of models and admin classes which can be imported, extended and reused by third party apps.

To extend django-loci, you MUST NOT add it to settings.INSTALLED_APPS, but you must create your own app (which goes into settings.INSTALLED_APPS), import the base classes of django-loci and add your customizations.

Extending models

This example provides an example of how to extend the base models of django-loci by adding a relation to another django model named Organization.

# models.py of your app
from django.db import models
from django_loci.base.models import (AbstractFloorPlan,
                                     AbstractLocation,
                                     AbstractObjectLocation)

# the model ``organizations.Organization`` is omitted for brevity
# if you are curious to see a real implementation, check out django-organizations


class OrganizationMixin(models.Model):
    organization = models.ForeignKey('organizations.Organization')

    class Meta:
        abstract = True


class Location(OrganizationMixin, AbstractLocation):
    class Meta(AbstractLocation.Meta):
        abstract = False

    def clean(self):
        # your own validation logic here...
        pass


class FloorPlan(OrganizationMixin, AbstractFloorPlan):
    location = models.ForeignKey(Location)

    class Meta(AbstractFloorPlan.Meta):
        abstract = False

    def clean(self):
        # your own validation logic here...
        pass


class ObjectLocation(OrganizationMixin, AbstractObjectLocation):
    location = models.ForeignKey(Location, models.PROTECT,
                                 blank=True, null=True)
    floorplan = models.ForeignKey(FloorPlan, models.PROTECT,
                                  blank=True, null=True)

    class Meta(AbstractObjectLocation.Meta):
        abstract = False

    def clean(self):
        # your own validation logic here...
        pass

Extending the admin

Following the previous Organization example, you can avoid duplicating the admin code by importing the base admin classes and registering your models with them.

But first you have to change a few settings in your settings.py, these are needed in order to load the admin templates and static files of django-loci even if it's not listed in settings.INSTALLED_APPS.

Add django.forms to INSTALLED_APPS, now it should look like the following:

INSTALLED_APPS = [
    # ...
    'django.contrib.gis',
    'django_loci',
    'django.contrib.admin',
    #      ↓
    'django.forms', # <-- add this
    #      ↑
    'leaflet',
    'channels'
    # ...
]

Now add EXTENDED_APPS after INSTALLED_APPS:

INSTALLED_APPS = [
    # ...
]

EXTENDED_APPS = ('django_loci',)

Add openwisp_utils.staticfiles.DependencyFinder to STATICFILES_FINDERS:

STATICFILES_FINDERS = [
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
    'openwisp_utils.staticfiles.DependencyFinder',
]

Add openwisp_utils.loaders.DependencyLoader to TEMPLATES:

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'OPTIONS': {
            'loaders': [
                'django.template.loaders.filesystem.Loader',
                'django.template.loaders.app_directories.Loader',
                # add the following line
                'openwisp_utils.loaders.DependencyLoader'
            ],
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    }
]

Last step, add FORM_RENDERER:

FORM_RENDERER = 'django.forms.renderers.TemplatesSetting'

Then you can go ahead and create your admin.py file following the example below:

# admin.py of your app
from django.contrib import admin

from django_loci.base.admin import (AbstractFloorPlanAdmin, AbstractFloorPlanForm,
                                    AbstractFloorPlanInline, AbstractLocationAdmin,
                                    AbstractLocationForm, AbstractObjectLocationForm,
                                    AbstractObjectLocationInline)
from django_loci.models import FloorPlan, Location, ObjectLocation


class FloorPlanForm(AbstractFloorPlanForm):
    class Meta(AbstractFloorPlanForm.Meta):
        model = FloorPlan


class FloorPlanAdmin(AbstractFloorPlanAdmin):
    form = FloorPlanForm


class LocationForm(AbstractLocationForm):
    class Meta(AbstractLocationForm.Meta):
        model = Location


class FloorPlanInline(AbstractFloorPlanInline):
    form = FloorPlanForm
    model = FloorPlan


class LocationAdmin(AbstractLocationAdmin):
    form = LocationForm
    inlines = [FloorPlanInline]


class ObjectLocationForm(AbstractObjectLocationForm):
    class Meta(AbstractObjectLocationForm.Meta):
        model = ObjectLocation


class ObjectLocationInline(AbstractObjectLocationInline):
    model = ObjectLocation
    form = ObjectLocationForm


admin.site.register(FloorPlan, FloorPlanAdmin)
admin.site.register(Location, LocationAdmin)

Extending channel consumers

Extend the channel consumer of django-loci in this way:

from django_loci.channels.base import BaseLocationBroadcast
from ..models import Location  # your own location model


class LocationBroadcast(BaseLocationBroadcast):
    model = Location

Extending AppConfig

You may want to reuse the AppConfig class of django-loci too:

from django_loci.apps import LociConfig


class MyConfig(LociConfig):
    name = 'myapp'
    verbose_name = _('My custom app')

    def __setmodels__(self):
        from .models import Location
        self.location_model = Location

Installing for development

Install sqlite:

sudo apt-get install sqlite3 libsqlite3-dev libsqlite3-mod-spatialite gdal-bin

Install your forked repo:

git clone git://github.com/<your_fork>/django-loci
cd django-loci/
python setup.py develop

Install test requirements:

pip install -r requirements-test.txt

Create database:

cd tests/
./manage.py migrate
./manage.py createsuperuser

Launch development server and SMTP debugging server:

./manage.py runserver

You can access the admin interface at http://127.0.0.1:8000/admin/.

Run tests with:

# pytests is used to test django-channels
./runtests.py && pytest

Contributing

Announce your intentions in the OpenWISP Mailing List
Fork this repo and install it
Follow PEP8, Style Guide for Python Code
Write code
Write tests for your code
Ensure all tests pass
Ensure test coverage does not decrease
Document your changes
Send pull request

Changelog

See CHANGES.

License

See LICENSE.

openwisp/django-loci

openwisp

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