xworkflows | Python `` state machine '' module | Machine Learning library

class RequestProcess(dxmodels.WorkflowEnabled):

    def __init__(self):
        lang = self.customer.user.customerprofile.language

    @xworkflows.on_enter_state('documents')
    def on_documents(self, *args, **kwargs):
        self.update_timestamps()
        ctx = {'request': self}
        EmailFromTemplate('request-required-documents', extra_context=ctx, lang=lang)\
            .send_to(self.customer.user)

    @xworkflows.on_enter_state('validation')
    def on_validation(self, *args, **kwargs):
        self.update_timestamps()
        validate_requirements_for_request(self)

    @xworkflows.on_enter_state('signature')
    def on_signature(self, *args, **kwargs):
        self.customer_product.lock()
        self.contract = create_contract(self)
        self.update_timestamps()
        ctx = {'request': self}
        EmailFromTemplate('product-request-accepted', extra_context=ctx, lang=lang)\
            .send_to(self.customer.user)

    class Meta:
        abstract = True