29 lines
922 B
ReStructuredText
29 lines
922 B
ReStructuredText
.. _topics-triggers:
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========
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Triggers
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========
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Triggers allow to define methods of :class:`~trytond.model.Model` that are
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called at the end of the transaction when one of those events happen to a
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record:
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* On Creation
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* On Modification
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* On Deletions
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* On Time: When a condition changes over time.
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The method signature is::
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<method name>(cls, records, trigger)
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Where ``records`` is the list of records that triggered the event and
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``trigger`` is the ``ir.trigger`` instance which is triggered.
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Triggers are defined by records of ``ir.trigger``. Each record must define a
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pyson condition which will be evaluated when the event occurs. Only those
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records for which the condition is evaluated to true will be processed by the
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trigger with the exception of modification triggers which will only process the
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records for which the condition is evaluated to false before and evaluated to
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true after the modification.
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