add orders app and add new model on products

core/apps/orders/models/__init__.py

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+from .order import *

core/apps/orders/models/order.py

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+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+from core.apps.shared.models import BaseModel
+from core.apps.products.models import Product, Unity
+from core.apps.projects.models import Project, ProjectDepartment
+from core.apps.accounts.models import User
+from core.apps.wherehouse.models import WhereHouse
+
+
+class Order(BaseModel):
+    product = models.ForeignKey(
+        Product, on_delete=models.CASCADE, related_name='orders'
+    )
+    unity = models.ForeignKey(
+        Unity, on_delete=models.CASCADE, related_name='orders'
+    )
+    project = models.ForeignKey(
+        Project, on_delete=models.CASCADE, related_name='orders'
+    )
+    project_department = models.ForeignKey(
+        ProjectDepartment, on_delete=models.DO_NOTHING, null=True, blank=True
+    )
+    wherehouse = models.ForeignKey(
+        WhereHouse, on_delete=models.CASCADE, related_name='orders'
+    )
+    date = models.DateField()
+    quantity = models.PositiveBigIntegerField(default=1)
+    
+    def __str__(self):
+        return f"{self.product} {self.unity} quantity order"
+    
+    class Meta:
+        verbose_name = _("Buyurtma")
+        verbose_name_plural = _("Buyurtmalar")
+
+
+class OrderApplication(BaseModel):
+    STATUS = (
+        ('NEW', 'yangi'),
+        ('CANCELLED', "bekor qilindi"),
+        ('ACCEPTED', 'qabul qilindi'),
+    )
+
+    orders = models.ManyToManyField(Order, related_name="applications")
+    employee = models.ForeignKey(User, on_delete=models.CASCADE, related_name='applications')
+    status = models.CharField(max_length=20, choices=STATUS)
+
+    def __str__(self):
+        return f"{self.employee} application"
+    
+    class Meta:
+        verbose_name = _("Ariza")
+        verbose_name_plural = _("Arizalar")