How to filter by external id in domain?

Question

I'm trying to constraint the domain of a many 2 one field using an external id (The XML id).
I want to be able to choose product which are variant of a specific product template.
#This piece of code doesn't work
the_field = fields.Many2one('product.product', domain = [('product_tmpl_id','=', "ref('the_package.the_external_id')")])

The code above doesn't work for some reason. But I've been able to look in the database to resolve the external id and it's 56. With that knowledge, I've been able to

Justin Lessard · Accepted Answer

I've found the solution to my problem with the help of Kinner Vachhani.
I simply needed to create a function which will return the domain filter like this:
@api.model
def _get_domain(self):
ids = self.env.ref('the_package.the_external_id').ids
return [('product_tmpl_id','=', ids)]

the_field = fields.Many2one('product.product',
required=False,
domain = _get_picking_product_domain)

Kinner Vachhani · Answer

You can get res_id (resource id) by searching ir_model_data.
E.g
imd_obj = self.pool['ir.model.data']
ext_ids = imd_obj._get_id('module_name', 'external_identifier')

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