Check product availability on form - return stock.quants - Odoo v8

Question

I need to check on my object lines for the locations on which the products are available, this are my classes:

class bsi_production_order(models.Model):
    _name = 'bsi.production.order'

    @api.model
    def create(self, vals):
        if vals.get('name', 'New') == 'New':
            if vals.get('production_type') == 'budgeted':
                vals['name'] = self.env['ir.sequence'].next_by_code('bsi.production.budgeted') or '/'
            elif vals.get('production_type') == 'nonbudgeted':
                vals['name'] = self.env['ir.sequence'].next_by_code('bsi.production.non_budgeted') or '/'
            elif vals.get('production_type') == 'direct':
                vals['name'] = self.env['ir.sequence'].next_by_code('bsi.production.direct') or '/'
        return super(bsi_production_order, self).create(vals)

    name = fields.Char('Reference', required=True, index=True, copy=False, readonly='True', default='New')
    date = fields.Date(string="Production Date")
    production_type = fields.Selection([
        ('budgeted','Budgeted'),
        ('nonbudgeted','Non Budgeted'),
        ('direct','Direct Order'),
    ], string='Type of Order', index=True,  
    track_visibility='onchange', copy=False,
    help=" ")
    notes = fields.Text(string="Notes")
    order_lines = fields.One2many('bsi.production.order.lines', 'production_order', states={'finished': [('readonly', True)], 'cancel': [('readonly', True)]}, string="Order lines", copy=True)
    print_orders = fields.One2many('bsi.print.order', 'production_orders', string="Print Orders")

On order_lines I should know what product quantity is available by returning the view with all the quants from this product (isbn)

This is bsi.production.line object (referred by order_lines One2many field):

class bsi_production_order_lines(models.Model):
    _name = 'bsi.production.order.lines'

    production_order = fields.Many2one('bsi.production.order', string="Production Orders")
    isbn = fields.Many2one('product.product', string="ISBN", domain="[('is_isbn', '=', True)]")
    qty = fields.Float(string="Quantity")
    product_template = fields.Many2one('product.template', string="Product")
    consumed_qty = fields.Float(string="Consumed quantity")
    remaining_qty = fields.Float(string="Remaining quantity", compute="_remaining_func") #

    @api.onchange('qty', 'consumed_qty')
    def _remaining_func(self):
        if self.qty or self.consumed_qty:
            self.remaining_qty = self.qty +(-self.consumed_qty)

I've taken the Qty on Hand method from product_template as inspiration, so this is my method (on bsi.production.order):

@api.depends('order_lines', 'order_lines.isbn')
def _get_products(self):
    isbn = []
    product_variant_ids = isbn.search(domain)
    for prodtmpl in self.order_lines: 
        isbn += [x.id for x in prodtmpl.product_variant_ids]
    return isbn

@api.one
def _get_act_window_dict(self, name):
    mod_obj = self.env['ir.model.data']
    act_obj = self.env['ir.actions.act_window']
    result = mod_obj.xmlid_to_res_id(name, raise_if_not_found=True)
    result = act_obj.read([result])[0]
    return result

@api.multi
def action_open_isbn(self):
    isbn = self._get_products()
    result = self._get_act_window_dict('stock.product_open_quants')
    result['domain'] = "[('isbn','in',[" + ','.join(map(str, isbn)) + "])]"
    result['context'] = "{'search_default_locationgroup': 1, 'search_default_internal_loc': 1}"
    return result

Right now, it throws me this:

Traceback (most recent call last):
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 546, in _handle_exception
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 583, in dispatch
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 319, in _call_function
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\service\model.py", line 118, in wrapper
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 316, in checked_call
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 812, in __call__
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 412, in response_wrap
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\openerp\addons\web\controllers\main.py", line 948, in call_button
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\openerp\addons\web\controllers\main.py", line 936, in _call_kw
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\api.py", line 268, in wrapper
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\api.py", line 399, in old_api
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\openerp\addons\bsi\models\models.py", line 1045, in action_open_isbn
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\openerp\addons\bsi\models\models.py", line 1030, in _get_products
AttributeError: 'list' object has no attribute 'search'

The error comes on this line product_variant_ids = isbn.search(domain), I know it's kind of weird, but I need to define this since product_variant_ids isn't defined on my method, also, I need to check this on product.product model, not product.template.

How can I adapt this method accordingly?

EDIT

I've tried @afwanwh solution, but now _get_act_window_dict method throws me this:

Traceback (most recent call last):
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 546, in _handle_exception
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 583, in dispatch
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 319, in _call_function
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\service\model.py", line 118, in wrapper
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 316, in checked_call
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 812, in __call__
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\http.py", line 412, in response_wrap
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\openerp\addons\web\controllers\main.py", line 948, in call_button
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\openerp\addons\web\controllers\main.py", line 936, in _call_kw
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\api.py", line 268, in wrapper
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\api.py", line 399, in old_api
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\openerp\addons\bsi\models\models.py", line 1669, in action_open_isbn
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\.\openerp\api.py", line 266, in wrapper
File "C:\Program Files (x86)\Odoo 8.0-20170914\server\openerp\addons\bsi\models\models.py", line 1663, in _get_act_window_dict
IndexError: list index out of range

I think it's because of the decorator, but I'm not sure, this method originally looked like this:

def _get_act_window_dict(self, cr, uid, name, context=None):
    mod_obj = self.pool.get('ir.model.data')
    act_obj = self.pool.get('ir.actions.act_window')
    result = mod_obj.xmlid_to_res_id(cr, uid, name, raise_if_not_found=True)
    result = act_obj.read(cr, uid, [result], context=context)[0]
    return result

Answer 1

I think, you have to do this:

@api.depends('order_lines', 'order_lines.isbn')
def _get_products(self):
    isbn = self.env['product.product']
    for prodtmpl in self.order_lines: 
        isbn |= prodtmpl.isbn
    return isbn

and this line in your method action_open_isbn

result['domain'] = "[('isbn','in',[" + ','.join(map(str, isbn.ids)) + "])]"

[UPDATE] Second error:

@api.model
def _get_act_window_dict(self, name):
    mod_obj = self.env['ir.model.data']
    result = mod_obj.xmlid_to_object(name)
    if not result:
        # this is just fallback if module stock is not installed
        # make sure you installed module stock and give dependency in your module
        result = {
            'view_type': 'form',
            'view_mode': 'tree,form',
            'res_model': 'stock.quant',
            'name': 'Stock On Hand',
            'type': 'ir.actions.act_window',
        }
    else:
        result = result[0].read()[0]
    return result