Selection field allows static value in list of tuples

    registration_state = fields.Selection([('select_1', 'One'), ('select_2', 'Two'), ('select_3', 'Three')], 'Select')

in that you can not add values.

so the solutions is to add a many2one field, which allows you to add value in it.  for that you need to define a new model of your selection.

class selection_selection(models.Model):
    _name = 'selection.selection'
    
    name = fields.Char('Name', required=True)
    value = fields.Char('Value', required=True)
    
now in your class you need to add many2one field which is referencing to your selection model like,

class your_model(models.Model):

    _name = 'your.model'
    
    my_selection = fields.Many2one(selection.selection, Selections)
    
now in xml file while defining the fields you need to add a widget to your selection field like,

    <field name="my_selection" widget="selection" />

to configure the selections you can make menu under configuration as per your need.

hope this helps.

Hi Luigi,

There are two kinds of "selection" fields, so there are two ways that the values are managed.

The one that is defined as "fields.selection(...)" [defined in the .py file, the model] has values defined there in a comma seperated list.  In this case you add the new value to the list in the .py file.

Or a field can be defined as a one to many2one(...), in which case the line that defines it in the .py file will indicate what table has the values. Usually use can add new values from the interface on this type of field.

you can use list to add item dynamically in fields.Selection

cnt=0
list1=[]
for i in range(1900,2017):
         list1.append((str(cnt),str(i)))
         cnt=cnt+1

class Employee(models.Model):

    _name = 'employee.details'
    year=fields.Selection(list1, string='Years', required=True, copy=True)