How to display group column with no data in OpenERP 7's Kanban View ?

Question

I want to ask something here about Kanban View in OpenERP 7,
I'm creating a Kanban view for my module.
the view is grouped by 4 stage of columns, so when I drag a record to another column the
stage of that record will be changed.
but here's the problem:
I want to drag a record from stage A to stage B.
but when there's no record in stage B the stage B's column will not be displayed until I've a record with stage B ,
so I can't change the stage by dragging the record because the stage B's column i

Mathieu Benoit · Answer

(Note: I add space on my link because the forum block my post if contain links)
I found this : http:// stackoverflow.com/questions/18680375/display-column-with-no-record-in-openerp-7-kanban-view
In the view, you have this :
<kanban default_group_by="stage_id">
You need to specify how sort the group in your class.
def _read_group_state(self, cr, uid, ids, domain, read_group_order=None, access_rights_uid=None, context=None):
pass
_group_by_full = { 'stage_id': _read_group_stage_ids}
You can check

Bréndou Serge Eric · Answer

Please Mathieu Benoit! can you show us how _read_group_state function should look like?

here is the his mine:

def _read_group_state(self, cr, uid, ids, domain, read_group_order=None, access_rights_uid=None, context=None):
print '_read_group_state'
access_rights_uid = access_rights_uid or uid
renting_obj = self.pool.get('mymodule.renting')

renting_ids = renting_obj._search(cr, uid, domain, order=read_group_order, access_rights_uid=access_rights_uid, context=context)
result = renting_obj.name_g

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