Thursday, July 12, 2018

While thinking about how to import legacy data from a TIM to Lino (#2364) I realized that our invoice_recipient field should rather be implemented as a OneToOneField than as an injected ForeignKey field. The problem with OneToOneField fields was that Lino did not yet handle them in a useful way. Now it does.

>>> from lino import startup
>>> startup('lino_book.projects.tera1.settings.doctests')
>>> from lino.api.doctest import *
>>> from django.db import models

>>> SalesRules = rt.models.invoicing.SalesRules
>>> SalesRule = rt.models.invoicing.SalesRule
>>> th = SalesRules.get_handle()
>>> th  
<lino.core.tables.TableHandle object at ...>
>>> th.store  
<lino.core.store.Store object at ...>

>>> SalesRules.column_names
'*'
>>> [sf.name for sf in th.store.list_fields]
['seqno', 'partner', 'invoice_recipient', 'paper_type', 'move_buttons', 'workflow_buttons', 'mobile_item', 'overview', 'disabled_fields', 'disable_editing']

>>> ar = None # SalesRules.request()
>>> partner = rt.models.contacts.Partner.objects.get(pk=124)
>>> partner.salesrule.invoice_recipient
Partner #121 ('Dericum Daniel')

When looking at a SalesRule object, the partner field is similar to a ForeignKey field:

>>> obj = SalesRule.objects.get(partner=partner)
>>> rmu(th.store.row2list(ar, obj))
[2, 'Dobbelstein Doroth\xe9e', 124, 'Dericum Daniel', 121, None, None, '', '', '', '', {}, True]

>>> pprint(th.store.row2dict(ar, obj))
{'disable_editing': True,
 'disabled_fields': {},
 'invoice_recipient': 'Dericum Daniel',
 'invoice_recipientHidden': 121,
 'paper_type': None,
 'paper_typeHidden': None,
 'partner': 'Dobbelstein Doroth\xe9e',
 'partnerHidden': 124}

>>> sf = th.store.list_fields[1]
>>> sf
OneToOneStoreField 'partner'

>>> sf.full_value_from_object(obj)
Partner #124 ('Dobbelstein Doroth\xe9e')

>>> de = SalesRules.get_data_elem('partner')
>>> de
<django.db.models.fields.related.OneToOneField: partner>

>>> sf.field is de
True