trytond-product_variant /

#This file is part product_variant module for Tryton.
#The COPYRIGHT file at the top level of this repository contains
#the full copyright notices and license terms.

import itertools
from trytond.pool import Pool, PoolMeta
from trytond.model import ModelView, ModelSQL, fields
from trytond.pyson import Eval, Greater, Not, Bool
from trytond.transaction import Transaction

__all__ = ['Product', 'Template', 'ProductAttribute', 'AttributeValue',
    'ProductTemplateAttribute', 'ProductAttributeValue']
__metaclass__ = PoolMeta

class Product:
    __name__ = 'product.product'
    attribute_values = fields.Many2Many('product.product-attribute.value',
        'product', 'value', 'Values', readonly=True,
        order=[('value', 'DESC')])
    template = fields.Many2One('product.template', 'Product Template',
        ondelete='CASCADE', select=1,
            'required': Greater(Eval('active_id', 0), 0),
            'invisible': Not(Greater(Eval('active_id', 0), 0)),
            'readonly': Not(Bool(Eval('variants')))

    def create(cls, vals):
        if vals.get('template') and not vals['template']:
            vals = vals.copy()
        return super(Product, cls).create(vals)

class Template:
    __name__ = 'product.template'
    basecode = fields.Char('Basecode',
            'invisible': Not(Bool(Eval('attributes')))
        }, depends=['attributes'])
    attributes = fields.Many2Many('product.template-product.attribute',
        'template', 'attribute', 'Attributes')
    variants = fields.Function(fields.Integer('Variants', select=1,
        help='Number variants from this template'),
        'get_variants', searcher='search_variants')

    def __setup__(cls):
        super(Template, cls).__setup__()
                'generate_variants': {
                    'invisible': Eval('template'),

    def delete(cls, templates):
        #don't know - but this prevent always the deleation of the template
        #so the user has to delete empty templates manually
        templates = list(set(templates))
        if Transaction().delete:
            return templates
        return super(Template, cls).delete(templates)

    def get_variants(self, name=None):
        variants = len(self.products)
        if variants <= 1:
            variants = None
        return variants

    def search_variants(cls, name, clause):
        res = []
        for template in[]):
            if len(template.products) >= clause[2]:
        return [('id', 'in', res)]

    def create_code(self, basecode, variant):
        Config = Pool().get('product.variant.configuration')
        config = Config(1)
        sep = config.code_separator or ''
        code = '%s%s' % (basecode or '', ['', sep][bool(basecode)])
        code = code + sep.join(i.code for i in variant)
        return code

    def create_product(self, template, variant):
        "Create the product from variant"
        pool = Pool()
        Product = pool.get('product.product')
        Value = pool.get('product.product-attribute.value')
        code = self.create_code(template.basecode, variant)
        new_id = Product.create({'template':, 'code': code})
        for value in variant:
            Value.create({'product': new_id, 'value':})
        return True

    def generate_variants(cls, templates):
        """generate variants"""
        for template in templates:
            if not template.attributes:
            already = set(tuple(i.attribute_values) for i in template.products)
            to_del = [ for i in template.products
                      if not i.attribute_values]
            values = [i.values for i in template.attributes]
            variants = itertools.product(*values)
            for variant in variants:
                if not variant in already:
                    cls.create_product(template, variant)

class ProductAttribute(ModelSQL, ModelView):
    "Product Attribute"
    __name__ = "product.attribute"
    sequence = fields.Integer('Sequence')
    name = fields.Char('Name', required=True, translate=True, select=1,
                       order_field="%(table)s.sequence %(order)s")
    values = fields.One2Many('product.attribute.value', 'attribute', 'Values')

    def __setup__(cls):
        super(ProductAttribute, cls).__setup__()
        cls._order.insert(0, ('sequence', 'ASC'))

    def default_sequence():
        return 0

class AttributeValue(ModelSQL, ModelView):
    "Values for Attributes"
    __name__ = "product.attribute.value"
    sequence = fields.Integer('Sequence')
    name = fields.Char('Name', required=True, select=1)
    code = fields.Char('Code', required=True)
    attribute = fields.Many2One('product.attribute', 'Product Attribute',

    def __setup__(cls):
        super(AttributeValue, cls).__setup__()
        cls._order.insert(0, ('sequence', 'ASC'))

    def default_sequence():
        return 0

class ProductTemplateAttribute(ModelSQL, ModelView):
    "Product Template - Product Attribute"
    __name__ = "product.template-product.attribute"
    attribute = fields.Many2One('product.attribute', 'Product Attribute',
            ondelete='RESTRICT', required=True)
    template = fields.Many2One('product.template', 'Product template',
            ondelete='CASCADE', required=True)

class ProductAttributeValue(ModelSQL, ModelView):
    "Product - Product Attribute Value"
    __name__ = "product.product-attribute.value"
    product = fields.Many2One('product.product', 'Product',
            ondelete='CASCADE', required=True)
    value = fields.Many2One('product.attribute.value', 'Attribute Value',
            ondelete='CASCADE', required=True)

    def search(cls, domain, offset=0, limit=None, order=None, count=False):
        '''Order attributes value by sequence'''
        res = super(ProductAttributeValue, cls).search(domain, offset=offset,
                limit=limit, order=order, count=count)
        obs = [(ob.value.attribute.sequence, for ob in res]
        res = [cls(i[1]) for i in obs]
        return res
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