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models

variable.models ¤

Classes¤

PermissionsBase ¤

Bases: Model

Base model for models that require permissions.

Functions¤
set_model_permissions() classmethod ¤

Set model-level add permissions.

Source code in management/models.py
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@classmethod
def set_model_permissions(cls):
    """Set model-level add permissions."""
    apply_add_permissions_to_standard_group(cls)
set_object_permissions() ¤

Set object-level delete, change and view permissions.

Source code in management/models.py
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def set_object_permissions(self):
    """Set object-level delete, change and view permissions."""
    delete, change, view, add = _get_perm_codenames(self.__class__)
    standard_group = Group.objects.get(name="Standard")
    anonymous_user = get_anonymous_user()

    # View permissions based on permissions level
    if self.visibility in ["public", "internal"]:
        assign_perm(view, standard_group, self)
        assign_perm(view, anonymous_user, self)
        if self.owner:
            remove_perm(view, self.owner, self)
    elif self.visibility == "private" and self.owner:
        remove_perm(view, standard_group, self)
        remove_perm(view, anonymous_user, self)
        if self.owner:
            assign_perm(view, self.owner, self)

    # Assign change and delete permissions for owner
    for perm in [change, delete]:
        remove_perm(perm, standard_group, self)
        remove_perm(perm, anonymous_user, self)
        if self.owner:
            assign_perm(perm, self.owner, self)

Sensor ¤

Bases: PermissionsBase

Specific sensor details.

Attributes:

Name Type Description
sensor_id int

Primary key, sensor id.

code

(str) sensor code.

sensor_type SensorType

sensor type.

sensor_brand SensorBrand

sensor brand.

model str

specific model of the sensor.

serial str

serial number of the sensor.

status bool

sensor status.

Functions¤
__str__() ¤

Return the sensor code.

Source code in sensor/models.py
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def __str__(self) -> str:
    """Return the sensor code."""
    return str(self.code)
get_absolute_url() ¤

Return the absolute url of the sensor.

Source code in sensor/models.py
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def get_absolute_url(self) -> str:
    """Return the absolute url of the sensor."""
    return reverse("sensor:sensor_detail", kwargs={"pk": self.pk})

SensorInstallation ¤

Bases: PermissionsBase

Represents an installation of a Sensor at a Station, which measures a Variable.

It includes metadata for installation and finishing date, as well as state (active or not).

Attributes:

Name Type Description
sensorinstallation_id AutoField

Primary key.

variable ForeignKey

Variable measured by the sensor.

station ForeignKey

Station where the sensor is installed.

sensor ForeignKey

Sensor used for the measurement.

start_date DateField

Start date of the installation.

end_date DateField

End date of the installation.

state BooleanField

Is the sensor active?

Functions¤
get_absolute_url() ¤

Get the absolute URL of the object.

Source code in variable/models.py
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def get_absolute_url(self) -> str:
    """Get the absolute URL of the object."""
    return reverse("variable:sensorinstallation_detail", kwargs={"pk": self.pk})

Station ¤

Bases: PermissionsBase

Main representation of a station, including several metadata.

Attributes:

Name Type Description
visibility str

Visibility level of the object, including an "internal" option.

station_id int

Primary key.

station_code str

Unique code for the station.

station_name str

Brief description of the station.

station_type StationType

Type of the station.

country Country

Country where the station is located.

region Region

Region within the Country where the station is located.

ecosystem Ecosystem

Ecosystem associated with the station.

institution Institution

Institutional partner responsible for the station.

place_basin PlaceBasin

Place-Basin association.

station_state bool

Is the station operational?

timezone str

Timezone of the station.

delta_t DeltaT

Interval of data adquisition (in minutes).

station_latitude Decimal

Latitude of the station, in degrees [-90 to 90].

station_longitude Decimal

Longitude of the station, in degrees [-180 to 180].

station_altitude int

Altitude of the station.

influence_km Decimal

Area of influence in km2.

station_file ImageField

Photography of the station.

station_external bool

Is the station external?

Functions¤
__str__() ¤

Return the station code.

Source code in station/models.py
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def __str__(self) -> str:
    """Return the station code."""
    return str(self.station_code)
clean() ¤

Set the default delta_t value if not provided.

Source code in station/models.py
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def clean(self) -> None:
    """Set the default delta_t value if not provided."""
    super().clean()
    if not self.delta_t:
        self.delta_t = DeltaT.get_default()
get_absolute_url() ¤

Return the absolute url of the station.

Source code in station/models.py
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def get_absolute_url(self) -> str:
    """Return the absolute url of the station."""
    return reverse("station:station_detail", kwargs={"pk": self.pk})
set_object_permissions() ¤

Set object-level permissions.

This method is called by the save method of the model to set the object-level permissions based on the visibility level of the object. In addition to the standard permissions for the station, the view_measurements permission is set which controls who can view the measurements associated to the station.

Source code in station/models.py
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def set_object_permissions(self) -> None:
    """Set object-level permissions.

    This method is called by the save method of the model to set the object-level
    permissions based on the visibility level of the object. In addition to the
    standard permissions for the station, the view_measurements permission is set
    which controls who can view the measurements associated to the station.
    """
    super().set_object_permissions()

    standard_group = Group.objects.get(name="Standard")
    anonymous_user = get_anonymous_user()

    # Assign view_measurements permission based on permissions level
    if self.visibility == "public":
        assign_perm("view_measurements", standard_group, self)
        assign_perm("view_measurements", anonymous_user, self)
        if self.owner:
            remove_perm("view_measurements", self.owner, self)
    elif self.visibility == "internal":
        assign_perm("view_measurements", standard_group, self)
        remove_perm("view_measurements", anonymous_user, self)
        if self.owner:
            remove_perm("view_measurements", self.owner, self)
    elif self.visibility == "private":
        remove_perm("view_measurements", standard_group, self)
        remove_perm("view_measurements", anonymous_user, self)
        if self.owner:
            assign_perm("view_measurements", self.owner, self)

Unit ¤

Bases: PermissionsBase

Unit of measurement with a name and a symbol.

Attributes:

Name Type Description
unit_id AutoField

Primary key.

name CharField

Name of the unit, eg. meters per second.

initials CharField

Symbol for the unit, eg. m/s.

Functions¤
__str__() ¤

Return the string representation of the object.

Source code in variable/models.py
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def __str__(self) -> str:
    """Return the string representation of the object."""
    return str(self.initials)
get_absolute_url() ¤

Get the absolute URL of the object.

Source code in variable/models.py
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def get_absolute_url(self) -> str:
    """Get the absolute URL of the object."""
    return reverse("variable:unit_detail", kwargs={"pk": self.pk})

Variable ¤

Bases: PermissionsBase

A variable with a physical meaning.

Such as precipitation, wind speed, wind direction, soil moisture, including the associated unit. It also includes metadata to help identify what is a reasonable value for the data, to flag outliers and to help with the validation process.

The nature of the variable can be one of the following:

  • sum: Cumulative value over a period of time.
  • average: Average value over a period of time.
  • value: One-off value.

Attributes:

Name Type Description
variable_id AutoField

Primary key.

variable_code CharField

Code of the variable, eg. airtemperature.

name CharField

Human-readable name of the variable, eg. Air temperature.

unit ForeignKey

Unit of the variable.

maximum DecimalField

Maximum value allowed for the variable.

minimum DecimalField

Minimum value allowed for the variable.

diff_error DecimalField

If two sequential values in the time-series data of this variable differ by more than this value, the validation process can mark this with an error flag.

outlier_limit DecimalField

The statistical deviation for defining outliers, in times the standard deviation (sigma).

null_limit DecimalField

The max % of null values (missing, caused by e.g. equipment malfunction) allowed for hourly, daily, monthly data. Cumulative values are not deemed trustworthy if the number of missing values in a given period is greater than the null_limit.

nature CharField

Nature of the variable, eg. if it represents a one-off value, the average over a period of time or the cumulative value over a period

Attributes¤
is_cumulative: bool property ¤

Return True if the nature of the variable is sum.

Functions¤
__str__() ¤

Return the string representation of the object.

Source code in variable/models.py
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def __str__(self) -> str:
    """Return the string representation of the object."""
    return str(self.name)
clean() ¤

Validate the model fields.

Source code in variable/models.py
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def clean(self) -> None:
    """Validate the model fields."""
    if self.maximum < self.minimum:
        raise ValidationError(
            {
                "maximum": "The maximum value must be greater than the minimum "
                "value."
            }
        )
    if not self.variable_code.isidentifier():
        raise ValidationError(
            {
                "variable_code": "The variable code must be a valid Python "
                "identifier. Only letters, numbers and underscores are allowed, and"
                " it cannot start with a number."
            }
        )
    return super().clean()
get_absolute_url() ¤

Get the absolute URL of the object.

Source code in variable/models.py
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def get_absolute_url(self) -> str:
    """Get the absolute URL of the object."""
    return reverse("variable:variable_detail", kwargs={"pk": self.pk})