Add Procedure model and integrate into CaseForm; update views and templates for procedure handling

atlas/models.py

@@ -396,6 +396,35 @@ class PathologicalProcess(models.Model):
         return format_html("<a href='{}'>{}</a>", self.get_absolute_url(), self.name)
 
 
+class Procedure(SynMixin, models.Model):
+    """A procedure or operation performed on the patient (attachable to Cases).
+
+    This mirrors the lightweight structure used by `Presentation` / `PathologicalProcess`.
+    """
+    name = models.CharField(max_length=255, unique=True)
+
+    # Optional canonical/alias pointer for future synonym handling
+    canonical = models.ForeignKey(
+        "self",
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="aliases",
+        help_text="If set, this Procedure is an alias and points to the canonical Procedure.",
+    )
+
+    subspecialty = models.ManyToManyField("subspecialty", blank=True)
+
+    def __str__(self) -> str:
+        return self.name
+
+    def get_absolute_url(self):
+        return reverse("atlas:procedure_detail", kwargs={"pk": self.pk})
+
+    def get_link(self):
+        return format_html("<a href='{}'>{}</a>", self.get_absolute_url(), self.name)
+
+
 class Differential(models.Model):
     condition = models.ForeignKey(Condition, on_delete=models.CASCADE)
     case = models.ForeignKey(
@@ -484,6 +513,13 @@ class Case(models.Model, AuthorMixin, QuestionMixin):
         help_text="The presentation(s) the case is associated with.",
     )
 
+    # Procedures performed on the patient (e.g. operations, interventions)
+    procedures = models.ManyToManyField(
+        "Procedure",
+        blank=True,
+        help_text="Procedure(s) or operations the patient has undergone.",
+    )
+
     pathological_process = models.ManyToManyField(PathologicalProcess, blank=True)
 
     differential = models.ManyToManyField(
@@ -830,6 +866,7 @@ class NormalCase(models.Model, AuthorMixin):
 
     notes = models.TextField(null=True, blank=True)
 
+
     class Meta:
         ordering = ["-added_date"]