nope this is not what I need. In this example product_ids is on the same model. I need a way to get them from the active/logged in user. Like domain="[('id', 'in', [user.products_ids.ids])]" but it says that there is no user and no I can't have a user_id relation in the model, else I could do it with api.onchange.

Ah ok. Still you can do it by fields_view_get method. Just override this method and add a domain in the field. In the method you will be able to find the products of the logged in user.

product_ids = self.env.user.product_ids.ids

domain = [('id', 'in', product_ids)]

hm... I never used this fields_view_get method, so I'll have to google a bit how to use it. So this forces the domain on the field? So this means that the filter will be active no mater the view? Because if yes I cannot use it, because I need it only in the form view in the list view I need all the records. Can define it only specific xml_id of view?

See my updated answers. You can do it for specific view as well. You can use "view_id" to add the domain on specific view:

self.env('module_name.form_view_xml_id').id == view_id

mate thanks... needed a bit to figure out the method. Your example helped. Just needed to change/add

product_ids = self.env.user.products_ids.ids

node.set('domain', "[('id', 'in', {})]".format(tuple(product_ids)))