How to limit the adding of item in a one2many field?

Question

I just want to limit the item that can be input in my

module( let's say 20 lines) which has one2many relationship.

Abegail Sanchez · Accepted Answer

I made some dirty hack in js

I added this line:

if(this.o2m.options.add_limit){
if(this.records.length < this.o2m.options.add_limit){
this._super.apply(this, arguments);
}else{
alert('Cannot add an item 
Limit Exceed:'+this.o2m.options.add_limit);
}
}else{
this._super.apply(this, arguments);
}

and this in my view.xml:

So the user cannot add item next of it.

Cybrosys Techno Solutions Pvt.Ltd · Answer

Hi,
Here is a more simpler method,
Use @api.constrains to limit the adding of item in a one2many field
Here is sample code:
class SaleOrder(models.Model):
_name = 'sale.order'
_description = 'Sale Order'
name = fields.Char(string='Name')
sale_lines = fields.One2many('sale.order.line', 'order_id', string='Sale Lines')
@api.constrains('sale_lines')
def _check_sale_lines(self):
for record in self:
if len(record.sale_lines) > 20:
raise ValidationError('Not more than 20 lines')
When a user attempts t

Nirav Jani · Answer

Hello,

you can use limit in one2many field. like this:

'order_line': fields.one2many('sale.order.line', 'order_id', 'Order Lines', *limit=10*),

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