I'm new to Odoo, and I'm tring to Migrate an addon from version 8 to 12.

So here the code from version 8:​

from openerp import models, exceptions, _, api
from functools import partial
from reportlab.graphics.barcode import createBarcodeDrawing
import logging
_logger = logging.getLogger(__name__)
# _logger.debug('1111111111 %s',docargs)

class ProductLabelReport(models.AbstractModel):
    _name = 'report.print_formats_product_label.label'

    @api.model
    def format_currency(self, value):
        return str('%.2f' % value).replace('.', ',')
        
    @api.model
    def get_price(self, product):
        pricelists = self.env['product.pricelist'].search([
            ('name', 'ilike', 'Public Pricelist'), ('type', '=', 'sale')])
        if not pricelists.exists():
            pricelists = self.env['product.pricelist'].search([('type', '=', 'sale')])
        if pricelists:
            prices = pricelists[0].price_get(product.id, 1)
            price_unit = prices[pricelists[0].id]
            price = product.taxes_id.compute_all(price_unit, 1)
            _logger.debug('2222222222 %s',price)
            return price['total_included']
        else:
            return 0.00

    @api.model
    def print_barcode(self, value, width, height):
        try:
            width, height = int(width), int(height)
            barcode = createBarcodeDrawing('EAN13', value=value, format='png', width=width, height=height)
            barcode = barcode.asString('png')
            barcode = barcode.encode('base64', 'strict')
        except (ValueError, AttributeError):
            raise exceptions.Warning(_('Cannot convert into barcode.'))
        return barcode

    @api.model
    def format_size(self, value, size):
        try:
            return value[:size]
        except:
            return value

    @api.model
    def get_variant_name(self, product):
        return '%s %s' % (product.name,'-'.join([v.name for v in product.attribute_value_ids]))

    @api.multi
    def render_product_label(self, docargs, data):
        docargs.update({
            'docs': self,
            'tmpl_name': 'print_formats_product_label.label_document'})
        return docargs

    @api.multi
    def render_html(self, data=None):
        docargs = {
            'doc_ids': self.ids,
            'doc_model': 'product.product',
            'format_currency': partial(self.format_currency),
            'get_price': partial(self.get_price),
            'print_barcode': partial(self.print_barcode),
            'format_size': partial(self.format_size),
            'get_variant_name': partial(self.get_variant_name)}
        render_func = self.env.context.get(
            'render_func', 'render_product_label')
        if hasattr(self, render_func):
            fnc = getattr(self, render_func)
            fnc(docargs, data)
        else:
            raise exceptions.Warning(_(
                'Don\'t have render func %s in object') % render_func)
        if not self.ids:
            raise exceptions.Warning(_('You must choose at least one record.'))
        return self.env['report'].browse(self.ids[0]).with_context(self.env.context).render('print_formats_product_label.label', docargs)

And my migrate on version 12:

from odoo import models, exceptions, _, api
from functools import partial
from reportlab.graphics.barcode import createBarcodeDrawing
import logging
_logger = logging.getLogger(__name__)
# _logger.debug('1111111111 %s',docargs)

class ProductLabelReport(models.AbstractModel):
    _name = 'report.print_formats_product_label.label'

    @api.model
    def format_currency(self, value):
        return str('%.2f' % value).replace('.', ',')

    @api.model
    def get_price(self, product):
        pricelists = self.env['product.pricelist'].search([('name', 'ilike', 'Public Pricelist'),('type', '=', 'sale')])
        if not pricelists.exists():
            pricelists = self.env['product.pricelist'].search([('type', '=', 'sale')])
        if pricelists:
            prices = pricelists[0].price_get(product.id ,1)
            price_unit = prices[pricelists[0].id]
            price = product.taxes_id.compute_all(price_unit, 1)
            return price['total_included']
        else:
            return 0.00

    @api.model
    def print_barcode(self, value, width, height):
        try:
            width, height = int(width), int(height)
            barcode = createBarcodeDrawing('EAN13', value=value, format='png', width=width, height=height)
            barcode = barcode.asString('png')
            barcode = barcode.encode('base64', 'strict')
        except (ValueError, AttributeError):
            raise exceptions.Warning(_('Cannot convert into barcode.'))
        return barcode

    @api.model
    def format_size(self, value, size):
        try:
            return value[:size]
        except:
            return value

    @api.model
    def get_variant_name(self, product):
        return '%s %s' % (prod_name.name,'-'.join([v.name for v in product.attribute_value_ids]))

    @api.multi
    def render_product_label(self, docargs, data):
        docargs.update({
            'docs': self.env['report.print_formats_product_label.label'].browse(data),
            'tmpl_name': 'print_formats_product_label.label_document'
            })
        return docargs
                
    @api.model
    def _get_report_values(self, docids, data=None):
        docargs = {
            'doc_ids': docids,
            'doc_model': 'product.product',
            'format_currency': partial(self.format_currency),
            'get_price': partial(self.get_price),
            'print_barcode': partial(self.print_barcode),
            'format_size': partial(self.format_size),
            'get_variant_name': partial(self.get_variant_name),
        }
                
        render_func = self.env.context.get('render_func', 'render_product_label')
        if hasattr(self, render_func):
            fnc = getattr(self, render_func)
            fnc(docargs, docids)
        else:
            raise exceptions.Warning(_('Don\'t have render func %s in object') % render_func)
        if not docids[0]:
            raise exceptions.Warning(_('You must choose at least one record.'))

        return self.env['ir.actions.report'].browse(docids[0]).with_context(self.env.context).render('print_formats_product_label.label', docargs)

Fast forward the only changes i made is on render_html to _get_report_values and inside.​

The output on v8 from debug:

{'format_size': <functools.partial object at 0x7f9a68fc0ba8>,
'doc_model': 'product.product',
'format_currency': <functools.partial object at 0x7f9a5a06de10>,
'get_price': <functools.partial object at 0x7f9a5a06dc00>,
'get_variant_name': <functools.partial object at 0x7f9a40d7a470>,
'docs': report.print_formats_product_label.label(28451,),
'tmpl_name': 'print_formats_product_label.label_document',
'print_barcode': <functools.partial object at 0x7f9a5a06d158>,
'doc_ids': [28451]}

The output on v12 from debug:

{'get_price': functools.partial(<bound method ProductLabelReport.get_price of report.print_formats_product_label.label()>), 
'tmpl_name': 'print_formats_product_label.label_document', 
'docs': report.print_formats_product_label.label(60,), 
'doc_model': 'product.product', 
'format_size': functools.partial(<bound method ProductLabelReport.format_size of report.print_formats_product_label.label()>), 
'print_barcode': functools.partial(<bound method ProductLabelReport.print_barcode of report.print_formats_product_label.label()>), 
'format_currency': functools.partial(<bound method ProductLabelReport.format_currency of report.print_formats_product_label.label()>), 
'get_variant_name': functools.partial(<bound method ProductLabelReport.get_variant_name of report.print_formats_product_label.label()>), 
'doc_ids': [60]}

As you can see im not getting any object id.

So basically on v12 partial is not working, how should modify my code?