On 2016-05-06 05:41, edbo.des...@gmail.com wrote:
> Hello,
>
> I think I'm using the Model. __post_setup__ class not correctly, but how
> I'm using it is working in Tryton-3.6.5 but not in Tryton-4.0.0 and maybe
> there are other ways to do it.
>
> What I'm trying to do, is to build an IOT-platform into Tryton where agents
> can connect to and update several values they allowed to change. To
> minimize database-queries and updating database-records or inserting new
> ones, I build a dict which lives in memory. The agents send the new values
> in and Tryton will update the values in the dict, and a cron-job will
> archive those values into the database at certain moments. The new values
> are also used to trigger events like sending mail, executing scripts etc.
>
> To create the dict in memory I'm using the __post_setup__ class to populate
> the dict with the several values.
>
> @classmethod
> def __post_setup__(cls):
> super(Trigger, cls).__post_setup__()
>
> # get the triggers
> triggers = cls.search( [('id', '>', 0 )] )
>
> if triggers:
> # Build the datastructure in memory
> for trigger in cls.browse( triggers ):
>
> sensors = []
> on_activate = []
> on_deactivate = []
>
> # get the sensors and conditions
> for sensor in trigger.sensor:
> if len(sensor.condition) > 2:
> sensors.append({
> "id" : sensor.id,
> "sensor" : sensor.sensor.id,
> "condition" : sensor.condition,
> })
>
> # only add the trigger to the list when there are
> # sensors and conditions
> if len(sensors):
> MEM_TRIGGERS.append({
> "id" : trigger.id,
> "name" : trigger.name,
> "sequence" : trigger.sequence,
> "min_delay" : trigger.minimum_time_delay,
> "min_active" : trigger.minimum_time_active,
> "when" : datetime.datetime.utcnow(),
> "activated" : trigger.activated,
> "enabled" : trigger.enabled,
> "sensors" : sensors
> })
>
> I have extended the ir.trigger with
> sensor = fields.One2Many('iot.triggersensors', 'trigger', 'Sensor')
>
> And the iot.triggersensors
>
> class TriggerSensor(ModelSQL, ModelView):
> "TriggerSensor"
> __name__ = 'iot.triggersensors'
>
> name = fields.Char('Name')
> trigger = fields.Many2One('ir.trigger', 'Trigger',
> domain=[('on_sensor','=',True)], ondelete='CASCADE')
> condition = fields.Char('Condition')
>
>
> This is working in Tryton version 3.65, but in 4.0.0 I get
>
> File "/home/ed/ERP/iot/trytond-4.0.0/trytond/pool.py", line 229, in setup
> cls.__post_setup__()
> File "/home/ed/ERP/iot/trytond-4.0.0/trytond/modules/iot/iot.py", line
> 1173, in __post_setup__
> for sensor in trigger.sensor:
> File "/home/ed/ERP/iot/trytond-4.0.0/trytond/model/modelstorage.py", line
> 1352, in __getattr__
> read_data = self.read(list(ids), ffields.keys())
> File "/home/ed/ERP/iot/trytond-4.0.0/trytond/model/modelsql.py", line
> 744, in read
> getter_result = field.get(ids, cls, fname, values=result)
> File "/home/ed/ERP/iot/trytond-4.0.0/trytond/model/fields/one2many.py",
> line 86, in get
> field = Relation._fields[self.field]
> AttributeError: type object 'iot.triggersensors' has no attribute '_fields'
>
> So my question is, are there other methods to accomplish this (after the
> Tryton-server is started create a dict into memory)? or is this a bug in
> Tryton-4.0.0?
It is definitely not a bug in 4.0. Your code was working before by
chance. The ORM should never be used during the initialization of the
Pool. Your code doesn't work any more probably because of the
optimization of the pool initialization.
Also you should be careful with global variable, your structure is
probably not thread-safe.
Finally, are you sure you need this? Of course database query is
expensive but included in all the stack of a request, I don't think it
has so much effect.
--
Cédric Krier - B2CK SPRL
Email/Jabber: cedric.kr...@b2ck.com
Tel: +32 472 54 46 59
Website: http://www.b2ck.com/
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