155 lines
5.3 KiB
Python
155 lines
5.3 KiB
Python
from django.db import models
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from django.utils import timezone
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from django.utils.html import format_html
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from datetime import datetime
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from django.contrib.auth.models import User
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from django.db.models import Count
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import math
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from config.extras import DateUUIDField
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import logging
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logger = logging.getLogger('django')
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class AvailableYeastManager(models.Manager):
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""" Special manager for filtering out pitched yeast."""
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def get_queryset(self):
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return super(AvailableYeastManager, self).get_queryset().filter(pitched=False)
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class CustomModel(models.Model):
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""" Custom model class with default fields to use. """
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created_date = models.DateTimeField(default=timezone.now)
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class Meta:
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abstract = True
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class Manufacturer(CustomModel):
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""" Store manufacturer data for various yeast strains."""
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name = models.CharField(max_length=100)
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website = models.URLField(max_length=200, blank=True, null=True)
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def __str__(self):
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# Return a string that represents the instance
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return self.name
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class Strain(CustomModel):
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"""
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Store individual yeast strain data. :model:`yeast.Manufacturer`.
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"""
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name = models.CharField(max_length=100)
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long_name = models.CharField(max_length=100, blank=True)
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manufacturer = models.ForeignKey(Manufacturer, on_delete=models.PROTECT)
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def __str__(self):
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# Return a string that represents the instance
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return '{}: {}'.format(self.manufacturer.name, self.name)
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class Storage(CustomModel):
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"""
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Data for methods of yeast storage. Used for calculating viability
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in :model:`yeast.Yeast`.
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"""
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name = models.CharField(max_length=100)
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viability_loss = models.DecimalField(max_digits=6, decimal_places=4)
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viability_interval = models.IntegerField(default=30)
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def __str__(self):
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# Return a string that represents the instance
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return self.name
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class Batch(CustomModel):
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"""
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Stores a batch of :model:`yeast.Yeast` of a single :model:`yeast.Strain`.
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Can be a single purchased pack, or multiple vials
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to be frozen from a starter.
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"""
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BATCH_TYPES = {
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'ST': 'Store',
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'PR': 'Propogated',
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'SL': 'Slurry',
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}
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id = DateUUIDField(primary_key=True)
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parent = models.ManyToManyField('Yeast', related_name='+', blank=True)
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production_date = models.DateField()
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strain = models.ForeignKey(Strain, on_delete=models.PROTECT, default=0)
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source = models.CharField(max_length=3, choices=BATCH_TYPES, default='ST')
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source_batch = models.ForeignKey('beer.Batch', null=True, blank=True, on_delete=models.PROTECT)
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notes = models.TextField(max_length=500, blank=True, null=True)
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def save(self, *args, **kwargs):
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super(Batch, self).save(*args, **kwargs)
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if self.source_batch:
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relate_samples = [x for x in Yeast.objects.all() if x.pitched_batch==self.source_batch]
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for sample in relate_samples:
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logger.critical(sample)
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self.parent.add(sample)
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@property
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def consumed(self):
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return not len(self.remaining_samples) > 0
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@property
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def remaining_samples(self):
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return [x for x in Yeast.available.all() if x.batch==self]
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def __str__(self):
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# Return a string that represents the instance
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return '{} [{}]'.format(self.strain, self.production_date.strftime("%Y-%m-%d"))
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class Yeast(CustomModel):
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"""
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Store an individual sample of yeast.
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"""
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id = DateUUIDField(primary_key=True)
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batch = models.ForeignKey(Batch, on_delete=models.CASCADE)
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generation_num = models.IntegerField(default=0)
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storage = models.ForeignKey(Storage, on_delete=models.CASCADE)
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cellcount = models.IntegerField(default=100)
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pitched = models.BooleanField(default=False)
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date_pitched = models.DateField(blank=True, null=True)
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pitched_batch = models.ForeignKey('beer.Batch', null=True, blank=True, on_delete=models.CASCADE)
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data_web = models.URLField(blank=True, null=True)
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lot_number = models.CharField(max_length=15, blank=True, null=True)
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notes = models.TextField(max_length=500, blank=True, null=True)
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objects = models.Manager()
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available = AvailableYeastManager()
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@property
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def name(self):
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return '{} {}'.format(self.id, self.batch.strain.name)
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@property
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def age(self):
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"""Return the age in days since the sample was propogated."""
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if self.pitched:
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end_date = self.date_pitched
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else:
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end_date = timezone.now().date()
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return abs((self.batch.production_date-end_date).days)
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@property
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def viability(self):
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"""Return the viability based on age and storage method (:model:`yeast.Storage`)."""
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return 0.97 * math.exp(self.age * math.log(1-self.storage.viability_loss)/self.storage.viability_interval)
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def __str__(self):
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# Return a string that represents the instance
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return '{} {}'.format(self.id, self.batch.strain.name)
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# class BeerBatch(CustomModel):
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# brewfather_id = models.CharField(max_length=50)
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# brewfather_num = models.IntegerField(default=1)
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# brewfather_name = models.CharField(max_length=500, default='name')
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# def __str__(self):
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# # Return a string that represents the instance
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# return 'BF #{num}: {name}'.format(name=self.brewfather_name, num=self.brewfather_num)
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