How to access a field of another model in a button with the attrs attribute?

Question

How do i access the field  product_id.product_tmpl_id.type  from the  sale.order.line model.
I have the following button in the xml view:
button name= "print_report"  string= "Print"  type= "object"  icon= "gtk-print"  attrs= "{'invisible':[('product_id.product_tmpl_id.type', '!=', 'product')]}" />.  With this statement , Odoo shows me the following error:
Uncaught   Error :  Campo  desconocido product_id.product_tmpl_id.type en el dominio [[ "product_id.product_tmpl_id.type" , "!=" , "product"

Wilbert Tan · Answer

Hi James, try to make a field related first in the sale.order.line model
Note that this code is in v8 odoo
#declare the selection first
PRODUCT_TYPE = [('consu', 'Consumable'),('service','Service'),('product', 'Product')]
#declare the field
field_related = fields.Selection(PRODUCT_TYPE, related='product_id.product_tmpl_id.type', string='Fields used for attrs', readonly=True)  #on the view.xml
button name="print_report" string="Print" type="object" icon="gtk-print" attrs="{'invisible':[('field_re

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