flows/*: Initial flows stage1 implementation

passbook/policies/models.py

@@ -0,0 +1,31 @@
+"""Policy base models"""
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+from passbook.core.models import Policy
+from passbook.lib.models import UUIDModel
+
+
+class PolicyBindingModel(models.Model):
+    """Base Model for objects which have Policies applied to them"""
+
+    policies = models.ManyToManyField(Policy, through="PolicyBinding", related_name="+")
+
+
+class PolicyBinding(UUIDModel):
+    """Relationship between a Policy and a PolicyBindingModel."""
+
+    enabled = models.BooleanField(default=True)
+
+    policy = models.ForeignKey(Policy, on_delete=models.CASCADE, related_name="+")
+    target = models.ForeignKey(
+        PolicyBindingModel, on_delete=models.CASCADE, related_name="+"
+    )
+
+    # default value and non-unique for compatibility
+    order = models.IntegerField(default=0)
+
+    class Meta:
+
+        verbose_name = _("Policy Binding")
+        verbose_name_plural = _("Policy Bindings")