Preparing files for transfer to PyRIGS

assets/models.py

@@ -0,0 +1,95 @@
+from django.db import models
+from django.urls import reverse
+
+import datetime
+
+
+class AssetCategory(models.Model):
+    class Meta:
+        verbose_name = 'Asset Category'
+        verbose_name_plural = 'Asset Categories'
+
+    name = models.CharField(max_length=80)
+
+    def __str__(self):
+        return self.name
+
+
+class AssetStatus(models.Model):
+    class Meta:
+        verbose_name = 'Asset Status'
+        verbose_name_plural = 'Asset Statuses'
+
+    name = models.CharField(max_length=80)
+
+    def __str__(self):
+        return self.name
+
+
+class Supplier(models.Model):
+    name = models.CharField(max_length=80)
+
+    def get_absolute_url(self):
+        return reverse('supplier_list')
+
+    def __str__(self):
+        return self.name
+
+
+class BaseAsset(models.Model):
+    class Meta:
+        abstract = True
+
+    parent = models.ForeignKey(to='self', related_name='asset_parent', blank=True, null=True, on_delete=models.SET_NULL)
+    asset_id = models.CharField(max_length=10)
+    description = models.CharField(max_length=120)
+    category = models.ForeignKey(to=AssetCategory, on_delete=models.CASCADE)
+    status = models.ForeignKey(to=AssetStatus, on_delete=models.CASCADE)
+    serial_number = models.CharField(max_length=150, blank=True)
+    purchased_from = models.ForeignKey(to=Supplier, on_delete=models.CASCADE, blank=True, null=True)
+    date_acquired = models.DateField()
+    date_sold = models.DateField(blank=True, null=True)
+    purchase_price = models.DecimalField(blank=True, null=True, decimal_places=2, max_digits=10)
+    salvage_value = models.DecimalField(blank=True, null=True, decimal_places=2, max_digits=10)
+    comments = models.TextField(blank=True)
+    next_sched_maint = models.DateField(blank=True, null=True)
+
+    # Cable assets
+    is_cable = models.BooleanField(default=False)
+    length = models.DecimalField(decimal_places=1, max_digits=10, blank=True, null=True)
+
+    def get_absolute_url(self):
+        return reverse('asset_detail', kwargs={'pk': self.pk})
+
+    def __str__(self):
+        return str(self.asset_id) + ' - ' + self.description
+
+
+class Asset(BaseAsset):
+    pass
+
+
+class Connector(models.Model):
+    description = models.CharField(max_length=80)
+    current_rating = models.DecimalField(decimal_places=2, max_digits=10, help_text='Amps')
+    voltage_rating = models.IntegerField(help_text='Volts')
+    num_pins = models.IntegerField(blank=True, null=True)
+
+    def __str__(self):
+        return self.description
+
+
+class Cable(BaseAsset):
+    plug = models.ForeignKey(Connector, on_delete=models.SET_NULL, related_name='plug', null=True)
+    socket = models.ForeignKey(Connector, on_delete=models.SET_NULL, related_name='socket', null=True)
+    length = models.DecimalField(decimal_places=1, max_digits=10, blank=True, null=True, help_text='m')
+    csa = models.DecimalField(decimal_places=2, max_digits=10, blank=True, null=True, help_text='mm^2')
+    circuits = models.IntegerField(blank=True, null=True)
+    cores = models.IntegerField(blank=True, null=True)
+
+    def cable_resistance(self):
+        rho = 0.0000000168
+        return (rho * self.length) / (self.csa * 1000000)
+
+    def __str__(self):
+        return '{} - {}m - {}'.format(self.plug, self.length, self.socket)