def send_datapoint_update_to_client(self, sender, **kwargs):
"""
Sends a JSON version of a changed datapoint via Websocket to the
lient.
TODO: Use a proper serializer.
"""
logger.debug(
"DatapointUpdate consumer got datapoint update %s",
kwargs
)
# Be aware that this datapoint is not the object from the
# database but the object that was created by the method that
# updated or created the datapoint. I.e. if the method wrote a
# number to a text field it will still be a number here. If that is an
# issue you can circumvent this by reloading the object from the DB.
# Only then the number will be converter to a text.
datapoint = kwargs["instance"]
if datapoint.id not in self.permitted_datapoint_ids:
return
dp_field_values = {}
for field in datapoint._meta.fields:
field_value = getattr(datapoint, field.name)
# JSON can't carry datetime objects.
if isinstance(field_value, datetime):
field_value = datetime_to_pretty_str(field_value)
dp_field_values[field.name] = field_value
self.send_json(dp_field_values)
def last_schedule_timestamp_pretty(self, obj):
"""
Displays a prettier timestamp format.
"""
dt = obj.last_schedule_timestamp
if dt is None:
return "-"
return datetime_to_pretty_str(dt)
def timestamp_pretty(self, obj):
"""
Displays a prettier timestamp format.
"""
ts = obj.timestamp
if ts is None:
return "-"
return datetime_to_pretty_str(ts)