Add consist app

dcc/consist/models.py

@@ -0,0 +1,53 @@
+from uuid import uuid4
+from django.db import models
+
+from metadata.models import Company, Tag
+from roster.models import RollingStock
+
+
+class Consist(models.Model):
+    uuid = models.UUIDField(
+        primary_key=True, default=uuid4,
+        editable=False)
+    identifier = models.CharField(max_length=128, unique=False)
+    tags = models.ManyToManyField(
+        Tag,
+        related_name='consist',
+        blank=True)
+    address = models.SmallIntegerField(default=None, null=True, blank=True)
+    company = models.ForeignKey(
+        Company, on_delete=models.CASCADE,
+        null=True, blank=True)
+    epoch = models.CharField(max_length=32, blank=True)
+    notes = models.TextField(blank=True)
+    creation_time = models.DateTimeField(auto_now_add=True)
+    updated_time = models.DateTimeField(auto_now=True)
+
+    def __str__(self):
+        return "{0}".format(self.identifier)
+
+
+class ConsistItem(models.Model):
+    consist = models.ForeignKey(
+        Consist, on_delete=models.CASCADE)
+    rolling_stock = models.ForeignKey(
+        RollingStock, on_delete=models.CASCADE)
+    order = models.PositiveIntegerField(default=0, blank=False, null=False)
+
+    class Meta(object):
+        ordering = ['order']
+
+    def __str__(self):
+        return "{0}".format(self.rolling_stock.identifier)
+
+    # def type(self):
+    #     return self.rolling_stock.type
+
+    def address(self):
+        return self.rolling_stock.address
+
+    def company(self):
+        return self.rolling_stock.company
+
+    def epoch(self):
+        return self.rolling_stock.epoch