def test_association_object_pattern(self):
""" Demonstrate the association object pattern (save-update)"""
session = TestSession()
p = Project(
name="The test project",
createdBy="me",
dateCreated=datetime.datetime.today(),
currency="UKP",
agroYearBegins=calendar.month_name[5],
)
# explicitly create an association object
# and populate it with one half of the relationship
assocn = ProjectLivelihoodZone()
assocn.zone = LivelihoodZone(
name="LZ 23",
createdBy="me",
dateCreated=datetime.datetime.today(),
population=632800,
coordinates=("POLYGON((-79.8 38.5, -80.03 38.2, " "-80.02 37.89, -79.92 37.75, -79.8 38.5))"),
consumptionYearBegins=calendar.month_name[5],
)
# make the other half of the relationship
p.livelihoodzones.append(assocn)
# Save-update cascade means we need to add only the project
# to the session; the other objects will be pulled in
# automatically
session.add(p)
self.assertEqual(len(session.new), 3)
session.commit()
self.assertEqual(session.query(ProjectLivelihoodZone).count(), 1)
self.assertEqual(session.query(LivelihoodZone).count(), 1)
self.assertEqual(session.query(Project).count(), 1)
# Get the name of a project which surveys LZ 23
self.assertEqual(
session.query(Project.name)
.join(Project.livelihoodzones)
.join(LivelihoodZone)
.filter(LivelihoodZone.name == "LZ 23")
.first(),
("The test project",),
)
# Sanity check against the empty set
self.assertEqual(
session.query(Project)
.join(Project.livelihoodzones)
.join(LivelihoodZone)
.filter(LivelihoodZone.name == "LZ 24")
.count(),
0,
)
def test_session_basic_use(self):
""" Demonstrate the basic pattern of use for a session """
session = TestSession()
p = Project(
name="A Project",
createdBy="me",
dateCreated=datetime.datetime.today(),
currency="UKP",
agroYearBegins=calendar.month_name[5],
)
# If the database is not fresh each time and test_session_multiple_use
# ran first this will fail
self.assertEqual(session.query(Project).count(), 0)
# There are no new objects in the session, but we are about to
# add one
self.assertEqual(len(session.new), 0)
session.add(p)
self.assertEqual(len(session.new), 1)
self.assertIn(p, session)
# After a commit the object stays in the session but is not 'new'
session.commit()
self.assertEqual(len(session.new), 0)
self.assertIn(p, session)
# But the real proof is whether it's gone into the database
self.assertEqual(session.query(Project).count(), 1)
def test_location_based_query(self):
""" Demonstrate querying in 2D space """
session = TestSession()
zone = LivelihoodZone(
name="Polygon test",
createdBy="me",
dateCreated=datetime.datetime.today(),
population=3,
coordinates=("POLYGON((1 9,5 12,8 9,8 4,5 1,2 3,1 9)," "(3 8,6 8,6 5,3 5,3 8))"),
consumptionYearBegins=calendar.month_name[5],
)
session.add(zone)
session.commit()
# Point is below-left of polygon
self.assertEqual(
session.query(LivelihoodZone).filter(LivelihoodZone.coordinates.gcontains("POINT(1 2)")).count(), 0
)
# Point is on outer edge of polygon
self.assertEqual(
session.query(LivelihoodZone).filter(LivelihoodZone.coordinates.gcontains("POINT(6 2)")).count(), 0
)
# Point is within polygon
self.assertEqual(
session.query(LivelihoodZone).filter(LivelihoodZone.coordinates.gcontains("POINT(5 3)")).count(), 1
)
# Point is on inner edge of polygon
self.assertEqual(
session.query(LivelihoodZone).filter(LivelihoodZone.coordinates.gcontains("POINT(3 6)")).count(), 0
)
# Point is in void of polygon
self.assertEqual(
session.query(LivelihoodZone).filter(LivelihoodZone.coordinates.gcontains("POINT(4 7)")).count(), 0
)
def test_date_based_query(self):
""" Demonstrate querying on date ranges """
today = datetime.date.today()
dates = [today + datetime.timedelta(days=i) for i in range(-3, 4)]
self.assertEqual(len(dates), 7)
session = TestSession()
for n, d in enumerate(dates):
session.add(
Project(
name="Project %d" % n,
createdBy="me",
dateCreated=d,
currency="UKP",
agroYearBegins=calendar.month_name[5],
)
)
session.commit()
# There is a project on every one of the last three days,
# the next three days, and today.
self.assertEqual(session.query(Project).filter(Project.dateCreated <= today).count(), 4)
self.assertEqual(session.query(Project).filter(Project.dateCreated > today).count(), 3)
self.assertEqual(session.query(Project).filter(Project.dateCreated == today).count(), 1)
# Beware! Date comparisons may not work how you think,
# if you mix date.today() and datetime.today(), etc.
# Use ranges to be safe, ie: the last 24 hours
end = datetime.datetime.now()
start = end - datetime.timedelta(hours=24)
self.assertEqual(session.query(Project.dateCreated).filter(Project.dateCreated.between(start, end)).count(), 1)
self.assertEqual(
session.query(Project.dateCreated).filter(Project.dateCreated.between(start, end)).first(), (today,)
)
def test_yearbegins_validation(self):
""" Test if year boundaries are a controlled set """
session = TestSession()
session.add(Project(
name="A Project",
createdBy="me",
dateCreated=datetime.datetime.today(),
currency="USD",
agroYearBegins="This is not a calendar term or date"))
session.commit()
self.assertEqual(session.query(Project).count(), 0)
def test_currency_validation(self):
""" Test if currency values are a controlled set """
session = TestSession()
session.add(Project(
name="A Project",
createdBy="me",
dateCreated=datetime.datetime.today(),
currency="This is not a currency category",
agroYearBegins=calendar.month_name[5]))
session.commit()
self.assertEqual(session.query(Project).count(), 0)
def test_coordinates_validation(self):
""" Test if geo coordinates are validated """
session = TestSession()
session.add(LivelihoodZone(
name="LZ 23",
createdBy="me",
dateCreated=datetime.datetime.today(),
population=632800,
coordinates="This is not a geospatial value",
consumptionYearBegins=calendar.month_name[5]))
session.commit()
self.assertEqual(session.query(LivelihoodZone).count(), 0)
def test_population_query(self):
""" Test if WKT field is interpreted correctly"""
session = TestSession()
polygonWKT = (
"POLYGON((-79.8 38.5, -80.03 38.2, "
"-80.02 37.89, -79.92 37.75, -79.8 38.5))")
session.add(LivelihoodZone(
name="LZ 23",
createdBy="me",
dateCreated=datetime.datetime.today(),
population=632800,
coordinates=polygonWKT,
consumptionYearBegins=calendar.month_name[5]))
session.commit()
lz = session.query(LivelihoodZone).first()
self.assertEqual(session.scalar(lz.coordinates.wkt), polygonWKT)
def test_population_validation(self):
""" Test if population figures are validated """
session = TestSession()
session.add(LivelihoodZone(
name="LZ 23",
createdBy="me",
dateCreated=datetime.datetime.today(),
population="This is not a numerical value",
coordinates="POLYGON((-79.8 38.5, -80.03 38.2, -80.02 37.89, "
"-79.92 37.75, -79.8 38.5))",
consumptionYearBegins=calendar.month_name[5]))
session.commit()
self.assertEqual(session.query(LivelihoodZone).count(), 0)
def test_session_multiple_use(self):
""" Test that a new test session gives you an empty database """
session = TestSession()
p = Project(
name="A Project",
createdBy="me",
dateCreated=datetime.datetime.today(),
currency="UKP",
agroYearBegins=calendar.month_name[5],
)
# If the database is not fresh each time, and test_session_basic_use
# ran first this will fail
self.assertEqual(session.query(Project).count(), 0)
session.add(p)
session.commit()
self.assertEqual(session.query(Project).count(), 1)
def test_session_context_as_transaction(self):
""" Demonstrate using the context of a session transaction """
session = TestSession()
p = Project(
name="A Project",
createdBy="me",
dateCreated=datetime.datetime.today(),
currency="UKP",
agroYearBegins=calendar.month_name[5],
)
self.assertEqual(session.query(Project).count(), 0)
with session.begin(subtransactions=True):
session.add(p)
self.assertEqual(len(session.new), 1)
self.assertIn(p, session)
# No need for explicit commit
self.assertEqual(session.query(Project).count(), 1)
