product.py

# -*- coding: utf-8 -*-
"""
    product.py

    :copyright: (c) 2015 by Openlabs Technologies & Consulting (P) Limited
    :license: see LICENSE for more details.
"""
from trytond.pool import PoolMeta
from trytond.model import ModelView, fields, ModelSQL

__metaclass__ = PoolMeta
__all__ = ['ProductSaleChannelListing', 'Product']


class Product:
    "Product"
    __name__ = "product.product"

    channel_listings = fields.One2Many(
        'product.product.channel_listing', 'product', 'Channel Listings',
    )


class ProductSaleChannelListing(ModelSQL, ModelView):
    '''Product - Sale Channel
    This model keeps a record of a product's association with Sale Channels.
    A product can be listed on multiple marketplaces
    '''
    __name__ = 'product.product.channel_listing'

    # TODO: Only show channels where this ability is there. For example
    # showing a manual channel is pretty much useless
    channel = fields.Many2One(
        'sale.channel', 'Sale Channel',
        domain=[('source', '!=', 'manual')],
        required=True, select=True,
        ondelete='RESTRICT'
    )
    product = fields.Many2One(
        'product.product', 'Product', required=True, select=True,
        ondelete='CASCADE'
    )
    product_identifier = fields.Char("Product Identifier")

    @classmethod
    def __setup__(cls):
        '''
        Setup the class and define constraints
        '''
        super(ProductSaleChannelListing, cls).__setup__()
        cls._sql_constraints += [
            (
                'channel_product_unique',
                'UNIQUE(channel, product)',
                'Each product can be linked to only one Sale Channel!'
            )
        ]