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55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
from datetime import datetime
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from django.db import models
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from django.utils import timezone
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# maximum time in years of a material part until being replaced
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MAX_TIME_MATERIAL = 5
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# Create your models here.
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class MaterialPart(models.Model):
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"""
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Represents one part of material, which is owned (and stored) by different
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members of the association (Ownership)
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"""
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name = models.CharField(max_length=30)
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buy_date = models.DateField('purchase date')
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def __str__(self):
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"""String representation"""
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return self.name
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def should_be_replaced(self):
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"""Returns wether the part should be replaced cause of age"""
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buy_time = timezone.make_aware(datetime.combine(self.buy_date,
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datetime.min.time()))
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return yearsago(MAX_TIME_MATERIAL) >= buy_time
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should_be_replaced.admin_order_field = 'buy_date'
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should_be_replaced.boolean = True
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should_be_replaced.short_description = 'Should be replaced?'
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class Ownership(models.Model):
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"""Represents the connection between a MaterialPart and a Member"""
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material = models.ForeignKey(MaterialPart, on_delete=models.CASCADE)
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owner = models.ForeignKey('members.Member')
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count = models.IntegerField(default=1)
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def __str__(self):
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"""String representation"""
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return str(self.owner)
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def yearsago(years, from_date=None):
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"""Function to return the date with a delta of years in the past"""
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if from_date is None:
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from_date = timezone.now()
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try:
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return from_date.replace(year=from_date.year - years)
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except ValueError:
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# 29.02 -> use 28.02
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assert from_date.month == 2 and from_date.day == 29
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return from_date.replace(month=2, day=28, year=from_date.year - years)
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