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models.py
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models.py
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import os
from sqlalchemy import Column, String, Integer,create_engine
from flask_sqlalchemy import SQLAlchemy
from geoalchemy2.types import Geometry
from shapely.geometry import Point
from geoalchemy2.shape import to_shape
from geoalchemy2.elements import WKTElement
from geoalchemy2.functions import ST_DWithin
from geoalchemy2.types import Geography
from sqlalchemy.sql.expression import cast
from geoalchemy2.shape import from_shape
from flask_login import UserMixin
db = SQLAlchemy()
'''
setup_db(app):
binds a flask application and a SQLAlchemy service
'''
def setup_db(app):
database_path = os.getenv('DATABASE_URL', 'DATABASE_URL_WAS_NOT_SET?!')
# https://stackoverflow.com/questions/62688256/sqlalchemy-exc-nosuchmoduleerror-cant-load-plugin-sqlalchemy-dialectspostgre
database_path = database_path.replace('postgres://', 'postgresql://')
app.config["SQLALCHEMY_DATABASE_URI"] = database_path
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
db.app = app
db.init_app(app)
'''
drops the database tables and starts fresh
can be used to initialize a clean database
'''
def db_drop_and_create_all():
db.drop_all()
db.create_all()
# Initial sample data:
insert_sample_locations()
def insert_sample_locations():
loc1 = SampleLocation(
description='Osterbrook 5',
geom=SampleLocation.point_representation(
latitude=53.550552,
longitude=10.057432
)
)
loc1.insert()
loc2 = SampleLocation(
description='Schadesweg 10',
geom=SampleLocation.point_representation(
latitude=53.546873,
longitude=10.05178
)
)
loc2.insert()
loc3 = SampleLocation(
description='Bei der Hammer Kirche 3',
geom=SampleLocation.point_representation(
latitude=49.852851,
longitude=12.109204
)
)
loc3.insert()
class SpatialConstants:
SRID = 4326
@staticmethod
def point_representation(latitude, longitude):
point = 'POINT(%s %s)' % (longitude, latitude)
wkb_element = WKTElement(point, srid=SpatialConstants.SRID)
return wkb_element
@staticmethod
def get_location_latitude(geom):
point = to_shape(geom)
return point.y
@staticmethod
def get_location_longitude(geom):
point = to_shape(geom)
return point.x
class SampleLocation(db.Model):
__tablename__ = 'sample_locations'
id = Column(Integer, primary_key=True)
description = Column(String(80))
geom = Column(Geometry(geometry_type='POINT', srid=SpatialConstants.SRID))
@staticmethod
def point_representation(latitude, longitude):
point = 'POINT(%s %s)' % (longitude, latitude)
wkb_element = WKTElement(point, srid=SpatialConstants.SRID)
return wkb_element
@staticmethod
def get_items_within_radius(lat, lng, radius):
"""Return all sample locations within a given radius (in meters)"""
#TODO: The arbitrary limit = 100 is just a quick way to make sure
# we won't return tons of entries at once,
# paging needs to be in place for real usecase
results = SampleLocation.query.filter(
ST_DWithin(
cast(SampleLocation.geom, Geography),
cast(from_shape(Point(lng, lat)), Geography),
radius)
).limit(100).all()
return [l.to_dict() for l in results]
def get_location_latitude(self):
point = to_shape(self.geom)
return point.y
def get_location_longitude(self):
point = to_shape(self.geom)
return point.x
def to_dict(self):
return {
'id': self.id,
'description': self.description,
'location': {
'lng': self.get_location_longitude(),
'lat': self.get_location_latitude()
}
}
# Fetching nearest users profile
def insert(self):
db.session.add(self)
db.session.commit()
def delete(self):
db.session.delete(self)
db.session.commit()
def update(self):
db.session.commit()
# My project App user Model
class AppUser(db.Model, UserMixin):
id = db.Column(db.Integer, primary_key=True)
firstname = db.Column(db.String(10), nullable=False)
lastname = db.Column(db.String(10), nullable=False)
lookup_address = db.Column(db.String(200), nullable=False)
email = db.Column(db.String(50), unique=True, nullable=False)
profile_pic = db.Column(db.String(20), nullable=False, default='default.jpg')
password = db.Column(db.String(60), nullable=False)
fluent_languages = db.Column(db.String(200), nullable=False)
other_languages = db.Column(db.String(200), nullable=False)
interests = db.Column(db.Text, nullable=False)
geom = db.Column(Geometry(geometry_type='POINT', srid=SpatialConstants.SRID))
def __repr__(self):
return f"AppUser('{self.firstname}', '{self.lastname}', '{self.lookup_address}, \
'{self.fluent_languages}', '{self.other_languages}','{self.profile_pic}', '{self.interests}')"
def to_dict(self):
return {
'id': self.id,
'firstname': self.firstname,
'lastname': self.lastname,
'profile_pic':self.profile_pic,
'fluent_languages': self.fluent_languages,
'other_languages': self.other_languages,
'interests':self.interests,
'location': {
'lng': SpatialConstants.get_location_longitude(self.geom),
'lat': SpatialConstants.get_location_latitude(self.geom)
}
}
@staticmethod
def get_items_within_radius(lat, lng, radius):
"""Return all sample locations within a given radius (in meters)"""
#TODO: The arbitrary limit = 100 is just a quick way to make sure
# we won't return tons of entries at once,
# paging needs to be in place for real usecase
results = AppUser.query.filter(
ST_DWithin(
cast(AppUser.geom, Geography),
cast(from_shape(Point(lng, lat)), Geography),
radius)
).limit(100).all()
return [l.to_dict() for l in results]