TandoorRecipes/cookbook/helper/unit_conversion_helper.py

78 lines
3.0 KiB
Python

from pint import UnitRegistry, UndefinedUnitError, PintError
from cookbook.models import Ingredient, Unit
CONVERT_TO_UNITS = {
'metric': ['g', 'kg', 'ml', 'l'],
'us': ['ounce', 'pound', 'fluid_ounce', 'pint', 'quart', 'gallon'],
'uk': ['ounce', 'pound', 'imperial_fluid_ounce', 'imperial_pint', 'imperial_quart', 'imperial_gallon'],
}
def base_conversions(ingredient_list):
ureg = UnitRegistry()
pint_converted_list = ingredient_list.copy()
for i in ingredient_list:
try:
conversion_unit = i.unit.name
if i.unit.base_unit:
conversion_unit = i.unit.base_unit
quantitiy = ureg.Quantity(f'{i.amount} {conversion_unit}')
# TODO allow setting which units to convert to
units = Unit.objects.filter(base_unit__in=(CONVERT_TO_UNITS['metric'] + CONVERT_TO_UNITS['us'] + CONVERT_TO_UNITS['uk'])).all()
for u in units:
try:
converted = quantitiy.to(u.base_unit)
ingredient = Ingredient(amount=converted.m, unit=u, food=ingredient_list[0].food, )
if not any((x.unit.name == ingredient.unit.name or x.unit.base_unit == ingredient.unit.name) for x in pint_converted_list):
pint_converted_list.append(ingredient)
except PintError:
pass
except PintError:
pass
return pint_converted_list
def get_conversions(ingredient):
conversions = [ingredient]
if ingredient.unit:
for c in ingredient.unit.unit_conversion_base_relation.all():
r = _uc_convert(c, ingredient.amount, ingredient.unit, ingredient.food)
if r and r not in conversions:
conversions.append(r)
for c in ingredient.unit.unit_conversion_converted_relation.all():
r = _uc_convert(c, ingredient.amount, ingredient.unit, ingredient.food)
if r and r not in conversions:
conversions.append(r)
conversions = base_conversions(conversions)
return conversions
def _uc_convert(uc, amount, unit, food):
if uc.food is None or uc.food == food:
if unit == uc.base_unit:
return Ingredient(amount=amount * (uc.converted_amount / uc.base_amount), unit=uc.converted_unit, food=food)
# return {
# 'amount': amount * (uc.converted_amount / uc.base_amount),
# 'unit': {
# 'id': uc.converted_unit.id,
# 'name': uc.converted_unit.name,
# 'plural_name': uc.converted_unit.plural_name
# },
# }
else:
return Ingredient(amount=amount * (uc.base_amount / uc.converted_amount), unit=uc.base_unit, food=food)
# return {
# 'amount': amount * (uc.base_amount / uc.converted_amount),
# 'unit': {
# 'id': uc.base_unit.id,
# 'name': uc.base_unit.name,
# 'plural_name': uc.base_unit.plural_name
# },
# }