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Code Issues Projects Releases Wiki Activity

Cables are now a thing, unfortunately by making a monolithic Asset model

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Co-authored-by: Arona Jones <aj@aronajones.com>
This commit is contained in:
Matthew Smith
2019-10-14 00:05:18 +01:00
parent b7e14b7dc3
commit aac900318e
9 changed files with 162 additions and 119 deletions
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85
assets/models.py
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@@ -1,9 +1,10 @@
from django.core.exceptions import ValidationError
from django.db import models
from django.urls import reverse
from polymorphic.models import PolymorphicModel
import datetime
import re
class AssetCategory(models.Model):
class Meta:
@@ -37,7 +38,17 @@ class Supplier(models.Model):
return self.name
class Asset(PolymorphicModel):
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 Asset(models.Model):
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, unique=True)
@@ -55,34 +66,56 @@ class Asset(PolymorphicModel):
# Cable assets
is_cable = models.BooleanField(default=False)
def get_absolute_url(self):
return reverse('asset_detail', kwargs={'pk': self.pk})
def __str__(self):
return str(self.asset_id) + ' - ' + self.description
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(Asset):
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)
plug = models.ForeignKey(Connector, on_delete=models.SET_NULL, related_name='plug', blank=True, null=True)
socket = models.ForeignKey(Connector, on_delete=models.SET_NULL, related_name='socket', blank=True, 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 get_absolute_url(self):
return reverse('asset_detail', kwargs={'pk': self.pk})
def __str__(self):
return '{} - {}m - {}'.format(self.plug, self.length, self.socket)
out = str(self.asset_id) + ' - ' + self.description
if self.is_cable:
out += '{} - {}m - {}'.format(self.plug, self.length, self.socket)
return out
def clean(self):
if self.date_sold and self.date_acquired > self.date_sold:
raise ValidationError({"date_sold": "Cannot sell an item before it is acquired"})
self.asset_id = self.asset_id.upper()
if re.search("^[a-zA-Z0-9]+$", self.asset_id) is None:
raise ValidationError({"asset_id": "An Asset ID can only consist of letters and numbers"})
if self.purchase_price and self.purchase_price < 0:
raise ValidationError({"purchase_price": "A price cannot be negative"})
if self.salvage_value and self.salvage_value < 0:
raise ValidationError({"purchase_price": "A price cannot be negative"})
if self.is_cable:
if self.length is None:
raise ValidationError({"length": "The length of a cable must be a number"})
elif self.csa is None:
raise ValidationError({"csa": "The csa of a cable must be a number"})
elif self.circuits is None:
raise ValidationError({"circuits": "The number of circuits in a cable must be a number"})
elif self.cores is None:
raise ValidationError({"cores": "The number of cores in a cable must be a number"})
elif self.socket is None:
raise ValidationError({"plug": "A cable must have a plug"})
elif self.plug is None:
raise ValidationError({"socket": "A cable must have a socket"})
if self.length <= 0:
raise ValidationError({"length": "The length of a cable must be more than 0"})
elif self.csa <= 0:
raise ValidationError({"csa": "The CSA of a cable must be more than 0"})
elif self.circuits <= 0:
raise ValidationError({"circuits": "There must be at least one circuit in a cable"})
elif self.cores <= 0:
raise ValidationError({"cores": "There must be at least one core in a cable"})