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models.py
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models.py
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from django.db import models
from django.utils.translation import ugettext_lazy as _
COMPONENT_GROUP_CHOICES = (
('main_dish', _('Main Dish')),
('dessert', _('Dessert')),
('diabetic', _('Diabetic Dessert')),
('fruit_salad', _('Fruit Salad')),
('green_salad', _('Green Salad')),
('pudding', _('Pudding')),
('compote', _('Compote')),
('sides', _('Sides')),
)
COMPONENT_GROUP_CHOICES_MAIN_DISH = COMPONENT_GROUP_CHOICES[0][0]
COMPONENT_GROUP_CHOICES_SIDES = COMPONENT_GROUP_CHOICES[7][0]
INGREDIENT_GROUP_CHOICES = (
('meat', _('Meat')),
('dairy', _('Dairy')),
('fish', _('Fish')),
('seafood', _('Seafood')),
('veggies_and_fruits', _('Veggies and fruits')),
('legumineuse', _('Legumineuse')),
('grains', _('Grains')),
('fresh_herbs', _('Fresh herbs')),
('spices', _('Spices')),
('dry_and_canned_goods', _('Dry and canned goods')),
('oils_and_sauces', _('Oils and sauces')),
)
RESTRICTED_ITEM_GROUP_CHOICES = (
('meat', _('Meat')),
('vegetables', _('Vegetables')),
('seafood', _('Seafood')),
('seeds and nuts', _('Seeds and nuts')),
('other', _('Other')),
)
class Ingredient(models.Model):
class Meta:
verbose_name_plural = _('ingredients')
# Information about the ingredient (in the recipe of a component)
name = models.CharField(
max_length=50,
verbose_name=_('name'),
unique=True,
)
description = models.TextField(
verbose_name=_('description'),
blank=True,
null=True,
)
ingredient_group = models.CharField(
max_length=100,
choices=INGREDIENT_GROUP_CHOICES,
verbose_name=_('ingredient group')
)
def __str__(self):
return self.name
class Component(models.Model):
class Meta:
verbose_name_plural = _('components (Dishes and recipes)')
# Meal component (ex. main dish, vegetable, seasonal) information
name = models.CharField(
max_length=50,
verbose_name=_('name'),
unique=True,
)
description = models.TextField(
verbose_name=_('description'),
blank=True,
null=True,
)
component_group = models.CharField(
max_length=100,
choices=COMPONENT_GROUP_CHOICES,
verbose_name=_('component group')
)
def __str__(self):
return self.name
@staticmethod
def get_day_ingredients(component_id, delivery_date):
"""Returns a list of the actual ingredients
of a component for the delivery date."""
q = Component_ingredient.objects.\
select_related('ingredient').\
filter(component__id=component_id, date=delivery_date)
return [ci.ingredient for ci in q]
@staticmethod
def get_recipe_ingredients(component_id):
"""Returns a list of the ingredients in the recipe of a component."""
q = Component_ingredient.objects.\
select_related('ingredient').\
filter(component__id=component_id, date=None)
return [ci.ingredient for ci in q]
class Component_ingredient(models.Model):
component = models.ForeignKey(
'meal.Component',
verbose_name=_('component'),
related_name='+',
on_delete=models.CASCADE
)
ingredient = models.ForeignKey(
'meal.Ingredient',
verbose_name=_('ingredient'),
related_name='+',
on_delete=models.CASCADE
)
date = models.DateField(
verbose_name=_('date'),
blank=True,
null=True,
)
def __str__(self):
if self.date:
return "<{}> includes <{}> on <{}>". \
format(self.component.name,
self.ingredient.name,
self.date)
else:
return "<{}> contains <{}>". \
format(self.component.name,
self.ingredient.name)
class Restricted_item(models.Model):
class Meta:
verbose_name_plural = _('restricted items (Restriction categories)')
# Information about restricted item categories that some clients never eat
# for allergy or other reasons (ex. Gluten, Nuts, Pork)
name = models.CharField(
max_length=50,
verbose_name=_('name')
)
description = models.TextField(
verbose_name=_('description'),
blank=True,
null=True,
)
restricted_item_group = models.CharField(
max_length=100,
choices=RESTRICTED_ITEM_GROUP_CHOICES,
verbose_name=_('restricted item group')
)
ingredients = models.ManyToManyField(
'meal.Ingredient',
through='Incompatibility'
)
def __str__(self):
return self.name
class Incompatibility(models.Model):
restricted_item = models.ForeignKey(
'meal.Restricted_item',
verbose_name=_('restricted item'),
related_name='+',
on_delete=models.CASCADE
)
ingredient = models.ForeignKey(
'meal.Ingredient',
verbose_name=_('ingredient'),
related_name='+',
on_delete=models.CASCADE
)
def __str__(self):
return "{} <clash> {}".format(self.restricted_item.name,
self.ingredient.name)
class Menu(models.Model):
class Meta:
verbose_name_plural = _('menus')
# Menu information for a specific date
date = models.DateField(verbose_name=_('date'))
components = models.ManyToManyField(
'meal.Component',
through="Menu_component"
)
def __str__(self):
return "Menu for {}".format(str(self.date))
@staticmethod
def create_menu_and_components(menu_date, dish_names):
"""Create the menu and its components for the date.
Parameters:
menu_date : date on which menu will apply
dish_names : a list of names of dishes included in the menu
Behavior:
- if Menu(s) already exists for the date, only one is kept and
all its menu components are replaced by the new ones
Raises :
- Exception if dish does not exist
- Exception if more that one dish per component_group
- Exception if no dish for COMPONENT_GROUP_CHOICES_MAIN_DISH
Returns:
Number of menu components created.
"""
num_menu_comp_created = 0
component_groups = {}
menus = Menu.objects.filter(date=menu_date)
if not menus:
menu = Menu(date=menu_date)
menu.save()
else:
# menu(s) existed, must flush their menu_components
Menu_component.objects.filter(menu__in=menus).delete()
# flush extra menus
for menu in menus[1:]:
Menu.objects.filter(id=menu.id).delete()
# reuse the first one
menu = menus[0]
for dish_name in dish_names:
components = Component.objects.filter(name=dish_name)
if not components:
raise Exception(
"Component ", dish_name, " does not exist")
component = components[0]
if component_groups.get(component.component_group):
raise Exception(
"Menu can only have one dish for component group " +
component.component_group)
component_groups[component.component_group] = dish_name
menu_component = Menu_component(menu=menu, component=component)
menu_component.save()
num_menu_comp_created += 1
# END FOR
if not component_groups.get(COMPONENT_GROUP_CHOICES_MAIN_DISH):
raise Exception(
"Menu must include one dish for component group " +
COMPONENT_GROUP_CHOICES_MAIN_DISH)
return num_menu_comp_created
class Menu_component(models.Model):
menu = models.ForeignKey(
'meal.Menu',
verbose_name=_('menu'),
related_name='+',
on_delete=models.CASCADE
)
component = models.ForeignKey(
'meal.Component',
verbose_name=_('component'),
related_name='+',
on_delete=models.CASCADE
)
def __str__(self):
return "On {} <menu includes> {}".format(str(self.menu.date),
self.component.name)