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models.py
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models.py
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import random
import string
from itertools import chain, groupby
from operator import attrgetter
from typing import Dict, List, Optional, Tuple
from uuid import uuid4
from django.conf import settings
from django.db import models
from django.urls import reverse
from django.utils.text import slugify
from django.utils.translation import ugettext_lazy as _
from mptt.querysets import TreeQuerySet
from unidecode import unidecode
from catalog.models import (
AbstractCategory,
AbstractProduct,
CategoryManager,
ProductActiveManager,
ProductManager,
)
from ecommerce.models import Order as ecOrder
from pages.models import CustomPage, ModelPage, Page, SyncPageMixin, PageManager
def randomize_slug(slug: str) -> str:
slug_hash = ''.join(
random.choices(string.ascii_lowercase, k=settings.SLUG_HASH_SIZE)
)
return f'{slug}_{slug_hash}'
class SECategoryQuerySet(TreeQuerySet):
def get_categories_tree_with_pictures(self) -> 'SECategoryQuerySet':
categories_with_pictures = (
self
.filter(products__page__images__isnull=False)
.distinct()
)
return categories_with_pictures.get_ancestors(include_self=True)
class SECategoryManager(CategoryManager.from_queryset(SECategoryQuerySet)):
pass
class Category(AbstractCategory, SyncPageMixin):
objects = SECategoryManager()
uuid = models.UUIDField(default=uuid4, editable=False)
@classmethod
def get_default_parent(cls):
return CustomPage.objects.filter(slug='catalog').first()
@property
def image(self):
products = self.products.all()
return products[0].image if products else None
def get_absolute_url(self):
return reverse('category', args=(self.page.slug,))
class Product(AbstractProduct, SyncPageMixin):
# That's why we are needed to explicitly add objects manager here
# because of Django special managers behaviour.
# Se se#480 for details.
objects = ProductManager()
actives = ProductActiveManager()
category = models.ForeignKey(
Category,
on_delete=models.CASCADE,
null=True,
related_name='products',
verbose_name=_('category'),
)
tags = models.ManyToManyField(
'Tag',
related_name='products',
blank=True,
verbose_name=_('tags'),
)
vendor_code = models.SmallIntegerField(verbose_name=_('vendor_code'))
uuid = models.UUIDField(default=uuid4, editable=False)
purchase_price = models.FloatField(
default=0, verbose_name=_('purchase_price'))
wholesale_small = models.FloatField(
default=0, verbose_name=_('wholesale_small'))
wholesale_medium = models.FloatField(
default=0, verbose_name=_('wholesale_medium'))
wholesale_large = models.FloatField(
default=0, verbose_name=_('wholesale_large'))
def get_absolute_url(self):
return reverse('product', args=(self.vendor_code,))
@property
def average_rate(self):
"""Return rounded to first decimal averaged rating."""
rating = self.product_feedbacks.aggregate(
avg=models.Avg('rating')).get('avg', 0)
return round(rating, 1)
@property
def feedback_count(self):
return self.product_feedbacks.count()
@property
def feedback(self):
return self.product_feedbacks.all().order_by('-date')
def get_params(self):
return Tag.objects.filter_by_products([self]).get_group_tags_pairs()
# @todo #388:30m Move Product.get_siblings method to refarm-site
# And reuse it on STB.
def get_siblings(self, offset):
return (
self.__class__.actives
.filter(category=self.category)
.prefetch_related('category')
.select_related('page')[:offset]
)
def get_brand_name(self) -> str:
brand: Optional['Tag'] = Tag.objects.get_brands([self]).get(self)
return brand.name if brand else ''
class ProductFeedback(models.Model):
product = models.ForeignKey(
Product, on_delete=models.CASCADE, null=True,
related_name='product_feedbacks'
)
date = models.DateTimeField(
auto_now=True, db_index=True, verbose_name=_('date'))
name = models.CharField(
max_length=255, db_index=True, verbose_name=_('name'))
rating = models.PositiveSmallIntegerField(
default=1, db_index=True, verbose_name=_('rating'))
dignities = models.TextField(
default='', blank=True, verbose_name=_('dignities'))
limitations = models.TextField(
default='', blank=True, verbose_name=_('limitations'))
general = models.TextField(
default='', blank=True, verbose_name=_('limitations'))
def _default_payment():
"""Default payment option is first element of first tuple in options."""
assert settings.PAYMENT_OPTIONS[0][0], 'No payment options!'
return settings.PAYMENT_OPTIONS[0][0]
class Order(ecOrder):
address = models.TextField(blank=True, default='')
payment_type = models.CharField(
max_length=255,
choices=settings.PAYMENT_OPTIONS,
default=_default_payment()
)
comment = models.TextField(blank=True, default='')
@property
def payment_type_name(self):
"""Return name for an order's payment option."""
return next(
name for option, name in settings.PAYMENT_OPTIONS
if self.payment_type == option
)
def set_positions(self, cart):
"""Save cart's state into Order instance."""
self.save()
for id_, position in cart:
self.positions.create(
order=self,
product_id=id_,
vendor_code=position['vendor_code'],
name=position['name'],
price=position['price'],
quantity=position['quantity']
)
return self
class CategoryPage(ModelPage):
"""Create proxy model for Admin."""
class Meta(ModelPage.Meta): # Ignore PycodestyleBear (E303)
proxy = True
objects = ModelPage.create_model_page_managers(Category)
class ProductPage(ModelPage):
"""Create proxy model for Admin."""
class Meta(ModelPage.Meta): # Ignore PycodestyleBear (E303)
proxy = True
objects = ModelPage.create_model_page_managers(Product)
class TagGroup(models.Model):
uuid = models.UUIDField(default=uuid4, editable=False) # Ignore CPDBear
name = models.CharField(
max_length=100, db_index=True, verbose_name=_('name'))
position = models.PositiveSmallIntegerField(
default=0, blank=True, db_index=True, verbose_name=_('position'),
)
def __str__(self):
return self.name
class TagQuerySet(models.QuerySet):
def filter_by_products(self, products: List[Product]):
ordering = settings.TAGS_ORDER
distinct = [order.lstrip('-') for order in ordering]
return (
self
.filter(products__in=products)
.order_by(*ordering)
.distinct(*distinct, 'id')
)
def get_group_tags_pairs(self) -> List[Tuple[TagGroup, List['Tag']]]:
grouped_tags = groupby(self.prefetch_related('group'), key=attrgetter('group'))
return [
(group, list(tags_))
for group, tags_ in grouped_tags
]
def get_brands(self, products: List[Product]) -> Dict[Product, 'Tag']:
brand_tags = (
self.filter(group__name=settings.BRAND_TAG_GROUP_NAME)
.prefetch_related('products')
.select_related('group')
)
return {
product: brand
for brand in brand_tags for product in products
if product in brand.products.all()
}
class TagManager(models.Manager.from_queryset(TagQuerySet)):
def get_queryset(self):
return (
super().get_queryset()
.order_by(*settings.TAGS_ORDER)
)
def get_group_tags_pairs(self):
return self.get_queryset().get_group_tags_pairs()
def filter_by_products(self, products):
return self.get_queryset().filter_by_products(products)
def get_brands(self, products):
"""Get a batch of products' brands."""
return self.get_queryset().get_brands(products)
class Tag(models.Model):
# Uncomment it after moving to refarm with rf#162
# class Meta:
# unique_together = ('name', 'group')
objects = TagManager()
uuid = models.UUIDField(default=uuid4, editable=False)
name = models.CharField(
max_length=100, db_index=True, verbose_name=_('name'))
position = models.PositiveSmallIntegerField(
default=0, blank=True, db_index=True, verbose_name=_('position'),
)
# Set it as unique with rf#162
slug = models.SlugField(default='')
group = models.ForeignKey(
TagGroup, on_delete=models.CASCADE, null=True, related_name='tags',
)
def __str__(self):
return self.name
def save(self, *args, **kwargs):
if not self.slug:
# same slugify code used in PageMixin object
self.slug = slugify(
unidecode(self.name.replace('.', '-').replace('+', '-'))
)
doubled_tag_qs = self.__class__.objects.filter(slug=self.slug)
if doubled_tag_qs:
self.slug = randomize_slug(self.slug)
super(Tag, self).save(*args, **kwargs)
@staticmethod
def parse_url_tags(tags: str) -> list:
groups = tags.split(settings.TAGS_URL_DELIMITER)
return set(chain.from_iterable(
group.split(settings.TAG_GROUPS_URL_DELIMITER) for group in groups
))
def serialize_tags(
tags: TagQuerySet,
field_name: str,
type_delimiter: str,
group_delimiter: str,
) -> str:
group_tags_map = tags.get_group_tags_pairs()
_, tags_by_group = zip(*group_tags_map)
return group_delimiter.join(
type_delimiter.join(getattr(tag, field_name) for tag in tags_list)
for tags_list in tags_by_group
)
def serialize_tags_to_url(tags: TagQuerySet) -> str:
return serialize_tags(
tags=tags,
field_name='slug',
type_delimiter=settings.TAGS_URL_DELIMITER,
group_delimiter=settings.TAG_GROUPS_URL_DELIMITER
)
def serialize_tags_to_title(tags: TagQuerySet) -> str:
return serialize_tags(
tags=tags,
field_name='name',
type_delimiter=settings.TAGS_TITLE_DELIMITER,
group_delimiter=settings.TAG_GROUPS_TITLE_DELIMITER
)
class ExcludedModelTPageManager(PageManager):
def get_queryset(self):
return super().get_queryset().exclude(type=Page.MODEL_TYPE)
class ExcludedModelTPage(Page):
class Meta(Page.Meta): # Ignore PycodestyleBear (E303)
proxy = True
objects = ExcludedModelTPageManager()