Hello,

My code was working on v7 but when I move it to v8 I am getting an "is not JSON serializable" error

All I want to do is populate a Many2One field when another field in the view changes.

Here is the code which is giving me the error:

 amenity = fields.Many2one('sim.amenities','Payments Cols',required=True,ondelete='cascade')
	

@api.onchange('building')
def modify_amenities(self):
     res = {'value':{'amenities':False}}
     ret_ids = []
     if self.building:
          ret_ids = self.env['sim.amenities'].search([['cols', '=', self.building.id],])
	  ret_lines = []
              for amen_id in ret_ids:
		ret_sub_list = []
		ret_sub_list.append(0)
		ret_sub_list.append(False)
		ret_lines_dict = {}
		amenity_obj = self.env['sim.amenities'].browse(amen_id.id)
		print amenity_obj				
                ret_lines_dict.update({'name':amenity_obj.name})
		ret_sub_list.append(ret_lines_dict)
		ret_lines.append(ret_sub_list)
                res = {'value':{'amenity':ret_lines}}
	self.amenity = res

Any idea why I might be getting the error or in any case how can I populate the field amenity when the field building changes?

Any tip will be really appreciated! Thanks a lot