class Platform(db.Model):
__tablename__ = "platforms"
id = db.Column(db.Integer, primary_key=True)
class Type(enum.Enum):
drifter = 0
argo = 1
glider = 2
mission = 3
animal = 4
type = db.Column(db.Enum(Type), nullable=False)
unique_id = db.Column(db.String(128), unique=True)
_meta = db.relationship("PlatformMetadata",
back_populates="platform",
cascade="all, delete-orphan")
stations = db.relationship("Station",
back_populates="platform",
cascade="all, delete-orphan")
def get_meta(self) -> Dict[str, str]:
return MappingProxyType({pm.key: pm.value for pm in self._meta})
def set_meta(self, meta: Dict[str, str]):
self._meta = [
PlatformMetadata(key=k, value=v) for k, v in meta.items()
]
attrs = property(get_meta, set_meta)
def __repr__(self):
return f"Platform(id={self.id})"
class Station(db.Model):
__tablename__ = "stations"
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(256), nullable=True)
platform_id = db.Column(db.Integer,
db.ForeignKey("platforms.id"),
nullable=False,
index=True)
platform = db.relationship(
"Platform",
back_populates="stations",
cascade="all, delete-orphan",
single_parent=True,
)
samples = db.relationship("Sample",
back_populates="station",
cascade="all, delete-orphan")
time = db.Column(db.DateTime, nullable=False)
latitude = db.Column(db.Float, nullable=False)
longitude = db.Column(db.Float, nullable=False)
def __init__(self, **kwargs):
super(Station, self).__init__(**kwargs)
if self.latitude > 90 or self.latitude < -90:
raise ValueError(f"Latitude {self.latitude} out of range (-90,90)")
if self.longitude > 180 or self.longitude < -180:
raise ValueError(
f"Longitude {self.longitude} out of range (-180,180)")
def __repr__(self):
return (f"Station(id={self.id}, name={self.name}, time={self.time}, "
f"latitude={self.latitude}, longitude={self.longitude}, "
f"platform_id={self.platform_id})")
class Sample(db.Model):
__tablename__ = 'samples'
id = db.Column(db.Integer, primary_key=True, autoincrement=True)
datatype_key = db.Column(db.String(64), db.ForeignKey('datatypes.key'))
value = db.Column(db.Float)
depth = db.Column(db.Float)
station_id = db.Column(db.Integer, db.ForeignKey('stations.id'))
station = db.relationship("Station", back_populates='samples',
cascade="all, delete-orphan", single_parent=True)
datatype = db.relationship("DataType")
def __repr__(self):
return (
f'Sample('
f'depth={self.depth}, datatype="{self.datatype}", '
f'value={self.value})'
)
class PlatformMetadata(db.Model):
__tablename__ = 'platform_metadata'
platform_id = db.Column(db.Integer,
db.ForeignKey('platforms.id'),
primary_key=True)
key = db.Column(db.String(64), primary_key=True)
value = db.Column(db.String(256))
platform = db.relationship("Platform",
back_populates='_meta',
cascade="all, delete-orphan",
single_parent=True)
def __repr__(self):
return ('PlatformMetadata('
f'key="{self.key}", value="{self.value}", '
f'platform_id={self.platform_id}'
')')