how shall I use Many2one field to imitate the effect of dynamic selection fields?
I code as below in .py
_name = 'a.word'
chars = fields.Char()#
raw_field = fields.Selection(selection='_get_selection', string='What do you want ?')
ix = 
cols = self.chars.split(',')
for i , v in enumerate(cols):
but these don't work as my intention and I also search about it on web and know that I should use Many2one field to get the similar effect; but I don;t know details, could you give me some advice?