Adrian A. Baumann
23ede15938
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82 lines
1.9 KiB
Python
82 lines
1.9 KiB
Python
from django.db import models
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from mptt.models import MPTTModel, TreeForeignKey
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class BoxType(models.Model):
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"""A type of storage box with specific dimensions."""
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name = models.CharField(max_length=255)
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width = models.PositiveIntegerField(help_text='Width in millimeters')
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height = models.PositiveIntegerField(help_text='Height in millimeters')
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length = models.PositiveIntegerField(help_text='Length in millimeters')
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class Meta:
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ordering = ['name']
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def __str__(self):
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return self.name
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class Box(models.Model):
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"""A storage box in the lab."""
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id = models.CharField(
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max_length=10,
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primary_key=True,
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help_text='Alphanumeric identifier (max 10 characters)'
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)
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box_type = models.ForeignKey(
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BoxType,
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on_delete=models.PROTECT,
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related_name='boxes'
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)
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class Meta:
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verbose_name_plural = 'boxes'
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def __str__(self):
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return self.id
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class ThingType(MPTTModel):
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"""A hierarchical type/category for things stored in boxes."""
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name = models.CharField(max_length=255)
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parent = TreeForeignKey(
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'self',
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on_delete=models.CASCADE,
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null=True,
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blank=True,
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related_name='children'
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)
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class MPTTMeta:
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order_insertion_by = ['name']
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def __str__(self):
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return self.name
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class Thing(models.Model):
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"""An item stored in a box."""
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name = models.CharField(max_length=255)
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thing_type = models.ForeignKey(
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ThingType,
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on_delete=models.PROTECT,
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related_name='things'
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)
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box = models.ForeignKey(
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Box,
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on_delete=models.PROTECT,
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related_name='things'
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)
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description = models.TextField(blank=True)
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picture = models.ImageField(upload_to='things/', blank=True)
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class Meta:
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ordering = ['name']
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def __str__(self):
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return self.name
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