How does the sequence work with handle widget?

Question

I tried to add section_and_note_one2many widget in purchase order model. But the lines don't retain the sequence after saving.
I had to create a sequence record manually and write an onchange to increment the sequence. Which works perfectly.
But I see in the sale.order model there is nothing like separate sequence record or onchange. So I wonder how it works.
Thanks!

faOtools · Accepted Answer

Make sure that:

* you define the _order in the comodel of section_and_note_one2many table. It should be something like:

 _order = "sequence,id"

* you apply the widget 'handle' in the tree view in the column sequence, e.g.:

<field name='section_and_note_one2many'>
    <tree>
        <field name='sequence' widget='handle'/>
        <!-- Other fields -->
    </tree>
</field>

No onchange, write, or inverse methods are required. The logic is behind the widget 'handle' and the related javascript. The '_order' is responsible for saving the order

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